作者：
Luo Zipei;Sun Qi;Georges Martial Ndzana;Chen Lijun;Chen Yuqi;...
期刊：
Journal of Soil Science and Plant Nutrition,2024年:1-8 ISSN：0718-9508
通讯作者：
Lu sheng<&wdkj&>Wu Lichao
作者机构：
[Sun Qi; Chen Lijun; Chen Yuqi; Lu sheng] Key Laboratory of Soil and Water Conservation and Desertification Combating in Hunan Province, College of Forestry, Central South University of Forestry and Technology, Changsha, China;National Engineering Laboratory of Applied Technology for Forestry and Ecology in Southern China, Central South University of Forestry and Technology, Changsha, China;[Georges Martial Ndzana] Faculty of Agronomy and Agricultural Science, University of Dschang, Dschang, Cameroon;Key Laboratory of Cultivation and Protection for Non-Wood Forest Trees of National Ministry of Education, College of Forestry, Central South University of Forestry and Technology, Changsha, China;[Luo Zipei] Key Laboratory of Soil and Water Conservation and Desertification Combating in Hunan Province, College of Forestry, Central South University of Forestry and Technology, Changsha, China<&wdkj&>National Engineering Laboratory of Applied Technology for Forestry and Ecology in Southern China, Central South University of Forestry and Technology, Changsha, China
通讯机构：
[Lu sheng; Wu Lichao] K;Key Laboratory of Soil and Water Conservation and Desertification Combating in Hunan Province, College of Forestry, Central South University of Forestry and Technology, Changsha, China<&wdkj&>Key Laboratory of Soil and Water Conservation and Desertification Combating in Hunan Province, College of Forestry, Central South University of Forestry and Technology, Changsha, China<&wdkj&>Key Laboratory of Cultivation and Protection for Non-Wood Forest Trees of National Ministry of Education, College of Forestry, Central South University of Forestry and Technology, Changsha, China
摘要：
Camellia oleifera is intensively cultivated in subtropical areas of China, exposing soils to various threats. However, the effect of long-term cultivation of Camellia oleifera on soil properties remains unclear and needs to be elucidated to improve soil and Camelia oleifera sustainable management. This study collected soil samples from different Camellia oleifera planting ages (2, 10, and 40 years) and performed aggregate fractionation and various analyses including physico-chemical, soil organic matter chemical composition analyses and a semi-quantitative analysis of organic carbon functional groups to investigate the effect of long-term cultivation of Camellia oleifera on soil macroaggregates (< 2 mm), mesoaggregates (2-0.25 mm) and microaggregates (< 0.25 mm) formation, soil organic matter (SOM), available nitrogen (AN), available phosphorus (AP), and available potassium (AK). The aggregate particles increased with increasing Camellia oleifera planting ages. Camellia oleifera long-term cultivation did not affected the soil pH in the aggregates, but significantly (P < 0.05) increased SOM concentration with the decrease in soil aggregate size. Similarly, Phenolics-C, ketones-C, lignins-C, and alkenes-C increased in soil aggregates with increasing cultivation time and are mainly distributed in < 0.25 mm fraction. The aromatics-C, carboxylic-C, aliphatic-C, and polysaccharides-C declined with increasing cultivation time and were mainly distributed in 2-0.25 mm and < 2 mm fraction. AN is abundantly distributed in 2-0.25 mm and its abundance increases with Camellia oleifera long-term cultivation. All soils were poor in AP and AK. Our study indicated that long-term cultivation of Camellia oleifera promoted soil aggregate formation, increased available nitrogen (AN), soil organic matter (SOM) and controlled the change of SOM chemical composition. However, our study recommended providing available phosphorus (AP) and available potassium (AK) in soil with Camellia oleifera cultivation for sustainable management.
摘要：
Abstract Arbuscular mycorrhizal fungi (AMF) symbiosis plays essential roles in shaping rhizosphere soil available phosphorus (P) and organic P mobilization. However, current methods for assessing soil P often do not fully consider the potential role of arbuscular mycorrhizal fungi (AMF) in supplying biologically‐based phosphorus (BBP) to Eucalyptus. This study aims to investigate the effects of AMF on the soil BBP of Eucalyptus plantations and which species prefer to translocate them in phosphorus‐deficient soils. Rhizosphere soil samples of Eucalyptus plantations (in south China) exhibiting different ages (varying between 1 to 12 years) were selected to investigate the evolution of AMF and BBP in soils, as well as their interaction mechanism. The impacts of eight AMF families on BBP were investigated in rhizosphere soil. All BBP contents are significantly positively correlated with Olsen P in the rhizosphere soil of Eucalyptus plantations (p < 0.01). The BBP in soil was notably influenced by AMF diversity, while AMF richness showed little effect on BBP. The abundance of Glomeraceae taxa showed a positive correlation with BBP and a negative correlation with Paraglomeraceae. In contrast, the relative abundance of Glomeraceae was higher in older plantations (including Archaeosporaceae, Claroideoglomeraceae). From the above results, we concluded that different species of the AMF modulated their mycorrhizal traits by improving BBP uptake in the rhizosphere soil. AMF groups (such as Glomeraceae, Archaeosporaceae, Claroideoglomeraceae) should be introduced or amplified at the beginning of planting to promote the uptake and utilization of bioavailable P in Eucalyptus plantations. This study will deepen our understanding of AMF for effective BBP utilization in Eucalyptus plantations.
摘要：
This paper aims to reveal the effects of multi-generational succession of eucalyptus on soil fertility, organic structure and biological properties. Soil samples were collected from eucalyptus plantations of different stand ages (5, 11, 17 and 21 years old) in a typical area in south Asia, soil organic fraction structure and content characteristics were investigated using Fourier transform infrared (FTIR), and structural equation modelling (SEM) was used to explore influences of soil fertility, enzyme activity and organic fraction on stand biomass. FTIR analysis showed that 11 infrared absorption peaks existed in the soils of this study area, attributed to silicates, aromatics, carbonate ions, sugars, esters, polysaccharides, aliphatic hydrocarbons and phenolic alcohols. Combined with the results of peak area integration, the content of esters, aromatics and phenolic alcohols was significantly higher in 17- and 21-year-old stand soils than in control soils. The results of SEM showed that organic components were negatively related (p < 0.01) to enzyme activity and biomass, with standardized coefficients of 0.53 and 0.49, respectively. In summary, multi-generation succession of eucalyptus trees can change the structure of soil organic functional group composition and promote the enrichment of aromatic and phenolic alcohol functional groups. Such changes can directly inhibit the increase in eucalyptus biomass and indirectly negatively affect biomass by inhibiting enzyme activity.
期刊：
Land Degradation & Development,2023年34(2):441-452 ISSN：1085-3278
通讯作者：
Lu sheng
作者机构：
[Chen Lijun; Qi, Sun; Chen Yuqi; Lu Sheng; Wu, Lichao] Cent South Univ Forestry & Technol, Coll Forestry, Key Lab Soil & Water Conservat & Desertificat Com, Changsha 410004, Hunan, Peoples R China.;[Wu, Lichao] Cent South Univ Forestry & Technol, Coll Forestry, Natl Minist Educ, Key Lab Cultivat & Protect Nonwood Forest Trees, Changsha, Peoples R China.;[Wang CongYa] Hunan Tianhua Camellia Oleifera Technol Co Ltd, Youxian Camellia Oleifera Sci & Technol Ind Pk, Changsha, Peoples R China.
通讯机构：
[Lu sheng] K;Key Laboratory of Soil and Water Conservation and Desertification Combating in Hunan Province, College of Forestry, Central South University of Forestry and Technology, Changsha, PR China
摘要：
Abstract Understanding the mechanisms that govern microbial community assembly across a soil–plant continuum is crucial for predicting the responses of ecosystems to environmental changes. However, the impact of the health status of plants on microbial assemblies across these continuums remains poorly understood. In this study, we investigated the stochastic and deterministic processes associated with different aggregate particles and Camellia oleifera growth stages (sapling, maturity, and degeneration periods). The composition of bacterial communities in C. oleifera soil was significantly affected by cultivation length and aggregate size, and cultivation length plays a more important role in the regulation of bacterial composition. The assembly processes of the bacterial community were dominated by deterministic processes in soil aggregates at different growth stages. Soil structurality determined soil α‐diversity and β‐diversity to a greater extent than soil nutrient content. This study provides a comprehensive understanding of the evolutionary mechanisms of soil bacterial community in different soil aggregates and C. oleifera plantation lengths and highlights the significance of soil physical properties to mediate soil microbial community composition and abundance.
期刊：
JOURNAL OF BIOBASED MATERIALS AND BIOENERGY,2022年16(3):474-480 ISSN：1556-6560
作者机构：
[Qin, Zuoyu; Tang, Jian; Shi, Yuanyuan; Zhao, Junyu; Cao, Jizhao] Guangxi Zhuang Autonomous Reg Forestry Res Inst, Guangxi Res & Dev Ctr New Forestry Fertilizer, Nanning 530002, Peoples R China.;[Jiang, Lin] State Owned Qipo Forest Farm Guangxi, Nanning 530225, Peoples R China.;[Wu, Lichao] Cent South Univ Forestry & Technol, Coll Forestry, Key Lab Cultivat & Protect Nonwood Forest Trees N, Changsha 410004, Peoples R China.
关键词：
Visible-Near Infrared Spectroscopy;Near-Earth Remote Sensing;Linear Models;Plantation;Soil Information
摘要：
Soil organic carbon (SOC) is a measureable component of soil organic matter, the widely used partial least squares (PLS) have limited ability in screening variables, a large amount of redundancy in soil hyperspectral data leads to the complexity and instability of the inversion model. In this study, the Eucalyptus plantation soil in subtropical red soil area of southern China was analyzed, orthogonal partial least square (OPLS) was applied to construct models, combined with recursive feature elimination (RFE) for bands screening, and the organic carbon content inversion models with full-band, significant-band, and an RFE feature set was established. The results showed that the number of important principal components of the OPLS inversion model was lower than that of PLS, indicating that the addition of orthogonal verification improved accuracy in the selection of independent variables. Using first derivative and logarithmic first derivative transformation can significantly reduce the redundant data and enhance the sensitivity of hyperspectra to SOC. In conclusion, the OPLS method improves the prediction of traditional SOC linear modelling, reduces the number of dependent variables, and the amount of computation during modelling, which significantly improves the accuracy and stability of the established models.
期刊：
Soil Use and Management,2022年38(1):978-990 ISSN：0266-0032
通讯作者：
Lichao Wu
作者机构：
[Weng, Yilin; Lu, Sheng; Liu, Sen; Gan, Weixiang; Wu, Lichao] Cent South Univ Forestry & Technol, Coll Forestry, Key Lab Soil & Water Conservat & Desertificat Com, Changsha, Peoples R China.;[Li, Peng] Guangxi Zhuang Autonomous Reg Forestry Res Inst, Nanning, Peoples R China.;[Fu, Yujia; Wu, Lichao] Cent South Univ Forestry & Technol, Key Lab Cultivat & Protect Nonwood Forest Trees, Minist Educ, Changsha, Peoples R China.;[Tu, Jia] Hunan Acad Forestry, Changsha, Peoples R China.
通讯机构：
[Lichao Wu] K;Key Laboratory of Soil and Water Conservation and Desertification Combating of Hunan Province, College of Forestry, Central South University of Forestry and Technology, Changsha, China<&wdkj&>Key Laboratory of Cultivation and Protection for Non-Wood Forest Trees, Ministry of Education, Central South University of Forestry and Technology, Changsha, China
摘要：
Paulownia is a well-known, fast-growing tree genus that is widely planted for commercial cultivation in the warm temperate zone of the North China Plain. Fertilization as a standard practice can efficiently increase wood production and tree yield in those Paulownia plantations, but how different fertilization measures might affect soil microbial activity, microbial biomass and metabolic functioning unclear, especially in the subtropics. To fill this knowledge gap, we initiated long-term different fertilization experiments from afforestation, using a completely randomized block design consisting of a control, inorganic fertilizer, microelement-inorganic fertilizer and organic-inorganic compound fertilizer (OIF) treatments in South China's subtropical zone. The results revealed fertilization significantly increased soil enzyme activity and microbial biomass, especially that of urease, invertase, acid phosphatase, as well as the microbial biomass in terms of carbon and nitrogen, all of which increased most significantly in soil under the OIF treatment. The carbon source utilization levels of five carbon substrates under the OIF treatment, namely D-xylose, glucose-1-phosphate, D-cellobiose, alpha-ketobutyric acid and glycogen, were significantly higher than those of the others. From these data, we may reasonably infer that the application of organic fertilizer could offer an effective management practice for use in Paulownia plantations. The five carbon matrices may be the most efficient carbon sources for increasing the abundance of efficient soil microorganisms, improving soil fertility and achieving the sustainable development of Paulownia plantations.
作者机构：
[Xu, Yuxing; Wu, Lichao] Cent South Univ Forestry & Technol, Coll Forestry, Key Lab Soil & Water Conservat & Desertificat Com, Changsha 410004, Hunan, Peoples R China.;[Du, Apeng; Wang, Zhichao; Zhu, Wankuan; Li, Chao; Xu, Yuxing] Chinese Acad Forestry CAF, China Eucalypt Res Ctr CERC, Zhanjiang 524022, Guangdong, Peoples R China.;[Du, Apeng; Wang, Zhichao; Zhu, Wankuan; Xu, Yuxing] Guangdong Zhanjiang Eucalyptus Plantat Ecosyst Re, Zhanjiang 524022, Guangdong, Peoples R China.
通讯机构：
[Wu, Lichao; Du, Apeng] C;[Du, Apeng] G;Cent South Univ Forestry & Technol, Coll Forestry, Key Lab Soil & Water Conservat & Desertificat Com, Changsha 410004, Hunan, Peoples R China.;Chinese Acad Forestry CAF, China Eucalypt Res Ctr CERC, Zhanjiang 524022, Guangdong, Peoples R China.;Guangdong Zhanjiang Eucalyptus Plantat Ecosyst Re, Zhanjiang 524022, Guangdong, Peoples R China.
关键词：
Soil chemical propertie;Enzyme activity;16S rRNA amplicon sequencing;Bacterial community structure;Tax4Fun function prediction
摘要：
Multi-generational planting of Eucalyptus species degrades soil quality but the introduction of legumes can improve soil fertility and microbial diversity. However, the effects of introducing non-legume native tree species on soil nutrients and bacterial community structure remain poorly understood. This study investigated the impacts of the conversion of third generation monoculture Eucalyptus plantations to mixed systems including Eucalyptus urograndis with Cinnamomum camphora (EC) and E. urograndis with Castanopsis hystrix (EH), on soil chemical and biochemical properties and bacterial community structure, diversity and functions. First generation E. urophylla plantations were the control. Results show that planting the third generation Eucalyptus led to a significant decrease in pH, organic matter, nutrient content, enzyme activities (invertin, acid phosphataes, and urease), and bacterial α-diversity compare to the controls. However, the mixed planting showed significant improvement in soil chemical and biochemical attributes and bacterial α-diversity, although the E. urograndis and C. hystrix planting had no improvement. Chloroflexi (oligotrophic bacteria) were significantly enriched in third generation Eucalyptus and Eucalyptus + C. hystrix, while proteobacteria increased significantly in the E. urograndis with C. camphora plantings. The relative abundance of multiple metabolic pathways increased significantly in the third generation Eucalyptus plantations whereas membrane transport-related genes were enriched in soils of the mixed systems. The changes in bacterial community structures in the two mixed systems were driven by diversity, organic matter and acid phosphatase, while bacterial functions were affected by invertase,
$${\mathrm{NO}}_{3}^{-}$$
-N, diversity and urease. These results suggest that the transformation of successive monoculture Eucalyptus plantations into mixed plantations reduces the depletion of soil nutrients and enhances the ecological function of soil microorganisms.
作者机构：
[Xu, Yuxing; Wu, Lichao] Cent South Univ Forestry & Technol, Coll Forestry, Key Lab Soil & Water Conservat & Desertificat Com, Changsha 410004, Hunan, Peoples R China.;[Du, Apeng; Wang, Zhichao; Zhu, Wankuan; Li, Chao; Xu, Yuxing] Chinese Acad Forestry CAF, China Eucalypt Res Ctr CERC, Zhanjiang 524022, Guangdong, Peoples R China.;[Ren, Shiqi] Guangxi Nanning Eucalypt Plantat Ecosyst Observat, Guangxi Forestry Res Inst, Nanning, Peoples R China.;[Liang, Yanfang] Qipo State Owned Forest Farm Guangxi Zhuang Auton, Nanning 530225, Guangxi, Peoples R China.
通讯机构：
[Lichao Wu] K;Key Laboratory of Soil and Water Conservation and Desertification Combating of Hunan Province, College of Forestry, Central South University of Forestry and Technology, Changsha, Hunan 410004, China
关键词：
Enzyme activity;FUNGuild;Illumina MiSeq sequencing;Microbial communities;Soil chemical properties;Tax4Fun
摘要：
Intensive management of Eucalyptus plantations has caused several social/environmental issues, including the concern over transformation of monoculture plantation cutover area. However, how different transformation patterns of Eucalyptus plantations affect soil microbial communities and their functions is unclear. In this study, the effects of different transformation patterns on structure and potential function of soil bacterial and fungal communities were evaluated. Soil chemical properties and acid phosphatase, urease, and catalase activities were also measured. In the third-generation monoculture Eucalyptus plantations, soil organic matter, nutrient contents, and microbial biomass decreased significantly and the relative abundance of oligotrophic bacteria (Chloroflexi) and symbiotic fungi (ectomycorrhizae) increased significantly compare with CK. However, in the Eucalyptus x Manglietia glauca Blume mixed plantation (E x M) and a Manglietia glauca Blume plantation (Manglietia), soil fertility (e.g., soil organic matter, total nitrogen, total phosphorus, and total potassium) improved, especially in E x M. In addition, soil acid phosphatase (0.30 mg center dot g- 1 center dot h- 1) and catalase (0.66 mg center dot g- 1 center dot h- 1) activities and the bacterial gene copies:fungal gene copies ratio (46.70) increased significantly in E x M compared with those in the monoculture plantations. The relative abundance of copiotrophic bacteria (Actinobacteria) and nitrogen cycle-associated bacteria (orders Rhizobiales and Frankiales) increased significantly in E x M. The abiotic factors soil available nitrogen and available zinc were the significant drivers of soil bacterial community structure, whereas the structure of fungal communities was most affected by tree species, in addition to soil pH and available copper. The results indicated that the E x M transformation pattern in the cutover area of Eucalyptus plantations had a significant beneficial effect on the soil fertility. The study also indicated that young plantations with Eucalyptus species have specific requirements for soil available phosphorus, available potassium, and available magnesium. Thus, increasing the supply of these nutrients during plantation development may have a positive effect on the sustainable management of plantations.
期刊：
Journal of Soils and Sediments,2021年21(8):2922-2937 ISSN：1439-0108
通讯作者：
Lichao Wu
作者机构：
[Lu, Sheng; Liu, Sen; Gan, Weixiang; Wu, Lichao] Cent South Univ Forestry & Technol, Coll Forestry, Key Lab Soil & Water Conservat & Desertificat Com, Changsha 410004, Hunan, Peoples R China.;[Li, Peng; Wu, Lichao] Guangxi Zhuang Autonomous Reg Forestry Res Inst, Yongwu Rd 23, Nanning 530002, Guangxi, Peoples R China.;[Van Zwieten, Lukas] New South Wales Dept Primary Ind, 1243 Bruxner Highway,10, Wollongbar, NSW 2477, Australia.;[Tu, Jia] Hunan Acad Forestry, Changsha 410004, Hunan, Peoples R China.;[Wang, Hailong] Foshan Univ, Sch Environm & Chem Engn, Foshan 528000, Guangdong, Peoples R China.
通讯机构：
[Lichao Wu] K;Key Laboratory of Soil and Water Conservation and Desertification Combating of Hunan Province, College of Forestry, Central South University of Forestry and Technology, Changsha, China<&wdkj&>Guangxi Zhuang Autonomous Region Forestry Research Institute, Nanning City, China<&wdkj&>Key Laboratory of Cultivation and Protection for Non-Wood Forest Trees, Ministry of Education, Central South University of Forestry and Technology, Hunan, China
关键词：
Soil fertility;Chloroflexi;High-throughput sequencing;Redundancy analysis;Nitrospiare;Shannon index
摘要：
Paulownia is the fastest-growing timber species all over the world which depended on exogenous nutrient input and scattered in the subtropical region of China. Practical experience proved that balanced fertilization can provide a rational nutrition supply for Paulownia cultivation by affecting soil microorganisms. However, there have been no rigorous studies on the effects of fertilization and edaphic variables on soil community structure and functions of Paulownia plantation in the subtropical region. We conducted a field plot experiment with four fertilization length levels of Paulownia plantation (abbreviated as 1-, 3-, 10-, and 13-yr) and a nearby native evergreen broadleaf forest (abbreviated as reference forest) to study the effects of the different fertilization lengths between them on soil bacterial community and the relationship with edaphic variables based on high-throughput sequencing and redundancy analysis. The results showed soil organic carbon, macronutrients, and boron in plantation were significantly higher than that in the reference forest, while fertilization treatments significantly increased Shannon and Heip indexes by up to 14.37 and 75%, respectively. Chloroflexi and Nitrospiare relative abundance in the Paulownia plantation was significantly lower than in the reference forest, which implied that fertilization treatment significantly promote nitrogen transformation processes, whereas Firmicutes showed the opposite trend. Soil organic carbon, nitrate-nitrogen, total potassium, and available boron are the key factors affecting bacterial communities as confirmed by Spearman’s correlation analysis and redundancy analysis. Our study stressed that fertilization duration is the main driving force for the improvement of bacterial community diversity and nitrogen cycling function, and major achieved by affecting edaphic variables.
作者机构：
[Qin, Zuoyu; Tang, Jian; Song, Xianchong; Shi, Yuanyuan; Wang, Huili; Zhao, Junyu] Forestry Minist China, Guangxi Forestry Res Inst, Key Lab Cent South Fast Growing Timber Cultivat, Nanning, Peoples R China.;[Wu, Lichao] Cent South Univ Forestry & Technol, Key Lab Cultivat & Protect Nonwood Forest Trees, Natl Minist Educ, Changsha, Peoples R China.
摘要：
Effective soil spectral band selection and modeling methods can improve modeling accuracy. To establish a hyperspectral prediction model of soil organic matter (SOM) content, this study investigated a forested Eucalyptus plantation in Huangmian Forest Farm, Guangxi, China. The Ranger and Lasso algorithms were used to screen spectral bands. Subsequently, models were established using four algorithms: partial least squares regression, random forest (RF), a support vector machine, and an artificial neural network (ANN). The optimal model was then selected. The results showed that the modeling accuracy was higher when band selection was based on the Ranger algorithm than when it was based on the Lasso algorithm. ANN modeling had the best goodness of fit, and the model established by RF had the most stable modeling results. Based on the above results, a new method is proposed in this study for band selection in the early phase of soil hyperspectral modeling. The Ranger algorithm can be applied to screen the spectral bands, and ANN or RF can then be selected to construct the prediction model based on different datasets, which is applicable to establish the prediction model of SOM content in red soil plantations. This study provides a reference for the remote sensing of soil fertility in forests of different soil types and a theoretical basis for developing portable equipment for the hyperspectral measurement of SOM content in forest habitats.
通讯机构：
[Wu, Lichao] C;Cent South Univ Forestry & Technol, Lab Soil & Water Conservat & Desertificat Control, Key Lab Cultivat & Protect Nonwood Forest Trees, Natl Minist Educ,Coll Forestry, Shaoshan South Rd 498, Changsha 410004, Hunan, Peoples R China.
关键词：
Burning harvest residues;Co-occurrence network;Community diversity;Natural connectivity;Structural equation model
摘要：
The land preparation method of burning harvested residues considerably affects soil archaeal and bacterial communities. However, the changes in the archaeal and bacterial communities of Eucalyptus urophylla plantation and the driving factors of microbial community diversity are still unknown. This study explored the effects of E. urophylla replacement for native vegetation and the burning of harvested residues on the diversity of archaeal and bacterial communities. Soil samples were collected from the E. urophylla plantation with burnt (Burn) and retained (Retain) harvest residues after 5 years, and the native vegetation was selected as a control (CK). Results show that significant differences in soil organic matter, available phosphorus, available boron, soil bulk density, and moisture content were found among the three stands (p < 0.05), and the concentrations of OM, AP and AB in Burn are the lowest, and BD is the highest. CK has the highest diversity of archaeal and bacterial communities, whereas Burn has the lowest. The co-occurrence network pattern of CK shows high robustness and high positive interaction between archaea and bacteria. However, Burn's network shows extremely low robustness and high negative interaction. Available phosphorus, organic matter, and bulk density are the key factors affecting archaeal and bacterial communities as confirmed by random forest models, redundant analysis, and structural equation modeling. Furthermore, the influence of environmental factors on archaeal communities is greater than that on bacteria, and the total effect of environmental factors on bacteria through archaeal community mediation is significant, including 79.45% indirect effects. These results can serve as a reference to enhance the management of harvested residues in E. urophylla plantations in the future.
摘要：
Se-enriched camellia oil has received increasing attention because it can improve the Se intake of diet for Se deficiency areas and has a wide spectrum of biological effects. Six main cultivars of camellia oil in Guangxi, including Camellia oleifera cenxiruanzhi 2 (CR2), CR3, C. oleifera xianglin 4 (XL4), XL40, C. oleifera changlin 1 (CL1), and CL210, were selected for fertilization experiment to produce Se-enriched camellia oil and investigated the effect of Se enrichment on quality. The Se content in camellia oil of six varieties was significantly increased by Se fertilizer application. CR2 had the maximum Se content and raise ratio compared to CK, which was 0.87 mg kg(-1) and fourfold, respectively. The Se contents in XL1, XL210, CR3, CL4, and CL40 improved by 2.14-, 2.77-, 3.58-, 2.56-, and 3.79-fold, respectively. Se fertilizer reduced the acid and peroxide values and increased the squalene and tocopherol contents. The acid value decreased by 38.29%-61.30%, the peroxide value decreased by 20.66%-61.79%, the tocopherol content increased by 7.76%-32.78%, and the squalene content increased by 13.53%-77.39%. The quality indices were significantly different among camellia oil varieties. Principal component analysis showed that CR2 obtained the highest score by comprehensive evaluation. Se fertilization, particularly for CR2 species, can significantly increase the contents of Se as well as functional components, such as squalene and tocopherol, and thus improve the quality of camellia oil.
期刊：
Land Degradation & Development,2019年30(6):636-646 ISSN：1085-3278
通讯作者：
Wu, Lichao
作者机构：
[Zhu, Lingyue; Chen, Fangfang; Li, Chunhua; Wu, Lichao] Cent South Univ Forestry & Technol, Natl Minist Educ, Key Lab Cultivat & Protect Nonwood Forest Trees, Changsha 410004, Hunan, Peoples R China.;[Wang, Xiuhai] Guangxi Di Yuan Zhi Ben Fertilizer Ind Co Ltd, Nanning 530001, Guangxi, Peoples R China.;[Wu, Lichao] Guangxi Zhuang Autonomous Reg Acad Forestry Sci, Guangxi Forestry Dept, Nanning 530002, Guangxi, Peoples R China.;[Wu, Lichao] Cent South Univ Forestry & Technol, Coll Forestry, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Wu, Lichao] C;Cent South Univ Forestry & Technol, Coll Forestry, Changsha 410004, Hunan, Peoples R China.
关键词：
Eucalyptus urophylla plantations;bacteria and fungi;community structure and diversity;enzyme activity;microbial biomass
摘要：
Eucalyptus are a widely used short-rotation species for timber production in South China. There are growing concerns regarding the influences of successive planting of Eucalyptus urophylla on microorganisms and soil. The aim of this work was to determine the effects of the successive planting of E. urophylla on soil characteristics. Five different stands, including 5-, 10-, 15-, and 18-year-old E. urophylla plantations (abbreviated as 5yr, 10yr, 15yr, and 18yr, respectively) and one native evergreen broadleaf forest as a 0-year-old E. urophylla plantation (abbreviated as CK) were used. All of measured chemical indicators, microbial biomass, and enzyme activities were significantly lower in E. urophylla plantations compared with CK stand. The microbial biomass and enzyme activities significantly decreased in 5yr stand, significantly increased in 10yr stand, and subsequently declined in 15yr and 18yr stands. The relative abundance of Ascomycota in 15yr (77.10%) and 18yr (72.71%) plantations was significantly higher than in other stands. Basidiomycota relative abundance in the E. urophylla plantations was significantly lower than in the CK stand. In addition, the bacterial diversity was significantly decreased in 15yr and 18yr stands, whereas the fungal diversity was the lowest in 5yr stand and significantly increased in 10yr, 15yr, and 18yr stands. Furthermore, structural equation modelling showed that successive planting of E. urophylla decreased the soil bacterial community diversity, microbial biomass, and enzyme activity but increased the fungal community diversity. Thus, successive planting of E. urophylla negatively influenced the soil bacterial diversity, microbial biomass, and enzyme activity and positively influenced soil fungal diversity.
期刊：
JOURNAL OF BIOBASED MATERIALS AND BIOENERGY,2019年13(6):863-869 ISSN：1556-6560
通讯作者：
Tan, Yimin
作者机构：
[Liu, Jie; Tan, Yimin] Hunan Univ Technol, Coll Life Sci & Chem, Zhuzhou 412007, Hunan, Peoples R China.;[Liu, Jie; Tan, Yimin] Hunan Univ Technol, Natl & Local Joint Engn Res Ctr Adv Packaging Mat, Zhuzhou 412007, Hunan, Peoples R China.;[Liu, Jie; Tan, Yimin; Wu, Lichao] Cent South Univ Forestry & Technol, Coll Forestry, Natl Minist Educ, Key Lab Cultivat & Protect Nonwood Forest Trees, Changsha 410000, Hunan, Peoples R China.;[Wei, Changjiang] Sanmenjiang State Owned Forest Farm, Liuzhou 545006, Guangxi, Peoples R China.;[Li, Fuchu] Changsha Fushan Agr Sci & Technol Co Ltd, Changsha 410000, Hunan, Peoples R China.
通讯机构：
[Tan, Yimin] H;[Tan, Yimin] C;Hunan Univ Technol, Coll Life Sci & Chem, Zhuzhou 412007, Hunan, Peoples R China.;Hunan Univ Technol, Natl & Local Joint Engn Res Ctr Adv Packaging Mat, Zhuzhou 412007, Hunan, Peoples R China.;Cent South Univ Forestry & Technol, Coll Forestry, Natl Minist Educ, Key Lab Cultivat & Protect Nonwood Forest Trees, Changsha 410000, Hunan, Peoples R China.
关键词：
Camellia oleifera Abel;Spraying Se Fertilizer;Soil Application Se Fertilizer;Yield;Oil Quality
摘要：
Camellia oleifera Abel (C. oleifera) is one of the four woody oil trees in the world, and tea oil is a kind of high quality edible oil which is known as "oriental olive oil." Selenium (Se) is an essential trace element for humans and animals and its deficiency is still a cause of concern in many countries. To improve Se content to produce Se-enriched oil and oil quality, C. oleifera was selected to study by applying Se in two ways. Seven treatments were set: CK (no Se fertilizer control), 1st group (spraying 25 mgSe/L in June), 2nd group (spraying 25 mgSe/L in June and July), 3rd group (spraying 25 mgSe/L in June, July and August), 4th group (soil application 96.6 gSe/hm(2)), 5th group (soil application 193.2 gSe/hm(2)), 6th group (soil application 386.4 gSe/hm(2)). The fruits were then collected in October to analyze Se concentration and quality of different fertilizer treatments by Factor Analysis. The results showed that: (1) Both spraying and soil application of Se significantly increased the Se content of fruit shell, seed shell and kernel. Spraying showed the highest content in nut, while soil application showed the highest content in seed shell. (2) Both spraying and soil application of Se significantly increased the Se content of tea oil. This was up to 0.0335 mg/kg by spraying Se and 0.0633 mg/kg by soil application in the following year, whose CK was 0.0071 mg/kg. (3) Both spraying and soil application of Se significantly increased the Se content of kernel rate, reduced the peroxide value and acid value, and increased the content of squalene, tocopherol of tea oil. The kernel rate increased by 6.7% soil application. The acid value and peroxide value declined to 22.92% and 20.68% after spraying, and declined to 39.58% and 51.99% after soil application. The content of squalene increased to 28.43% spraying, and 174.49% by soil application, and the content of tocopherol increased 27.74%, 86.81%., respectively. In conclusion, it is a feasible way for Se-enriched tea oil production by soil application, and the recommended dosage of Se fertilizer is 193.2 gSe/hm(2).
