期刊：
Science of The Total Environment,2024年922:171245 ISSN：0048-9697
通讯作者：
Zeng, Peng;Zhou, H
作者机构：
[Liao, Bohan; Zhou, Hang; Zeng, Peng; Liao, Ye; Liu, Jiawei; Gu, Jiaofeng; Ni, Li; Zeng, P] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Peoples R China.;[Liao, Bohan; Zeng, Peng; Gu, Jiaofeng; Zhou, Hang] Hunan Engn & Technol Res Ctr Soil Pollut Remediat, Changsha 410004, Peoples R China.;[Wang, Yun] Hunan Univ Arts & Sci, Coll Life & Environm Sci, Changde 415000, Peoples R China.;[Li, Qian; Gu, Jiaofeng] Hunan Res Inst Nonferrous Met Co Ltd, Changsha 410100, Peoples R China.
通讯机构：
[Zhou, H ; Zeng, P] C;Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Peoples R China.
关键词：
Cd and As pollution soil;Compound passivator coupled with foliar spraying and soil applying Si fertilizer;Health risk evaluation;Rice
摘要：
Cadmium (Cd) and arsenic (As) are precedence-controlled contaminants in paddy soils, that can easily accumulate in rice grains. Limestone and sepiolite (LS) compound passivator can obviously reduce Cd uptake in rice, whereas Si fertilizer can effectively decrease rice As uptake. Here, the synergistic effects of the LS compound passivator coupled with Si fertilizer (LSCS) on the soil pH and availability of Si, Cd, and As, as well as rice grain Cd and As accumulation and its health risk were studied based on a 3-year consecutive field experiment. The results showed that the LSCS performed the best in terms of synchronously decreasing soil Cd and As availability and rice Cd and As uptake. In the LSCS treatments, soil pH gradually decreased with the rice-planting season, while soil available Cd and As contents gradually increased, suggesting that the influence of LSCS on Cd and As availability gradually weakened with rice cultivation. Nonetheless, the contents of Cd and inorganic As (i-As) in rice grains treated with LSCS were slightly affected by cultivation but were significantly lower than the single treatments of LS compound passivator or Si fertilizer. According to the Cd and As limit standards in food (GB2762-2022), the Cd and i-As content in rice grains can be lowered below the standard by using the 4500kg/hm(2) LS compound passivator coupled with 90kg/hm(2) Si fertilizer in soil and spraying 0.4g/L Si fertilizer on rice leaves for at least three years. Furthermore, health risk evaluation revealed that LSCS treatments significantly reduced the estimated daily intake, annual excess lifetime cancer risk, and hazard quotient of Cd and i-As in rice grains. These findings suggest that LSCS could be a viable approach for reducing Cd and As accumulation in rice grains and lowering the potential health risks associated with rice.
期刊：
Science of The Total Environment,2024年908:168319 ISSN：0048-9697
通讯作者：
Wan, DJ;Gu, JF
作者机构：
[Wan, Da-juan] Hunan Normal Univ, Sch Geog Sci, Changsha 410081, Hunan, Peoples R China.;[Yang, Wen-jun; Liao, Bo-han; Zeng, Peng; Gu, Jiao-feng] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Hunan Engn Lab Control Rice Qual & Safety, Changsha 410004, Peoples R China.;[Yang, Wen-jun; Liao, Bo-han; Zeng, Peng; Gu, Jiao-feng; Zhou, Hang] Hunan Prov Key Lab Wetland & Soil Ecol Remediat, Changsha 410004, Peoples R China.
通讯机构：
[Wan, DJ ] H;[Gu, JF ] C;Hunan Normal Univ, Sch Geog Sci, Changsha 410081, Hunan, Peoples R China.;Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Hunan Engn Lab Control Rice Qual & Safety, Changsha 410004, Peoples R China.
关键词：
Auxiliary measures;Heavy metal contamination;Phytoremediation;Rotation mode
摘要：
Phytoremediation is the direct use of living green plants and it is an effective, inexpensive, non-invasive, and environmentally friendly technique used to transfer or stabilize all the toxic metals and environmental pollutants in polluted soil or ground water. To study the effect of tartaric acid, gibberellin, and tartaric acid coupled with gibberellin on rape-kenaf or rape-sweet sorghum rotation, a field experiment was carried out on a farmland combined polluted with Cd and Pb in eastern Hunan Province, China. The results showed that these two rotation systems coupled with superposition measure has potential to enhance yield and biomass of rape (Brassica napus L.), kenaf (Hibiscus cannabinus) and sweet sorghum (Sorghum dochna (F.) Snowden), as well as to increase Cd and Pb uptake of the three crops, thus accelerating phytoextraction. The Cd and Pb annual removal by rape-kenaf rotation in one year under different treatments were 269-438 and 112-149 g & sdot;hm- 2, respectively. And the Cd and Pb annual removal by rape-sweet sorghum rotation in one year under different treatments were 68.0-111 and 43.8-92.3 g & sdot;hm- 2, respectively. Under the two rotation systems, these integrated management measures can remove Cd and Pb up to 438 g & sdot;hm- 2 & sdot;year- 1 and 149 g & sdot;hm- 2 & sdot;year- 1, respectively. The Cd and Pb content in rape seeds or sweet sorghum stems and leaves were lower than the food or forage standard, indicating that we can use this rotation system for both remediation and safety production. Furthermore, the two rotation systems also generated considerable economic value. These results showed that the combination of phytoremediation and agricultural production is a feasible technical mode in the field of Cd and Pb co-contamination, and also provides useful information for further study of the interaction mechanism between rotation crops and enhancement measures. In subsequent experiments we can set concentration gradients for tartaric acid and gibberellin, and we can also select other crops for rotation, with a view to finding the optimal auxiliary measure and crop rotation modern.
作者机构：
[廖柏寒; 易轩韬; 周航; 辜娇峰] College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China;[李倩; 游萍; 欧阳坤] Hunan Hermes Safe Environmental Protection Science Co., Ltd., Changsha 410100, China;[欧阳坤] Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650504, China;[李倩] School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
作者机构：
[廖柏寒; 罗绪锋; 易轩韬; Zeng, Peng; 刘梦宇; 周航; 辜娇峰] College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
通讯机构：
[Zeng, P ] C;Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Peoples R China.;Cent South Univ Forestry & Technol, Hunan Engn Lab Control Rice Qual & Safety, Changsha 410004, Peoples R China.
关键词：
Bacterial communities;Cd and Pb co-contaminated soil;Phytoremediation;Robinia pseudoacacia L.;Tolerance response
摘要：
Woody plants possess great potential for phytoremediation of heavy metal-contaminated soil. A pot trial was conducted to study growth, physiological response, and Cd and Pb uptake and distribution in black locust (Robinia pseudoacacia L.), as well as the rhizosphere bacterial communities in Cd and Pb co-contaminated soil. The results showed that R. pseudoacacia L. had strong physiological regulation ability in response to Cd and Pb stress in contaminated soil. The total chlorophyll, malondialdehyde (MDA), soluble protein, and sulfhydryl contents, as well as antioxidant enzymes (superoxide dismutase, peroxidase, catalase) activities in R. pseudoacacia L. leaves under the 40 mg center dot kg(-1) Cd and 1000 mg center dot kg(-1) Pb co-contaminated soil were slightly altered. Cd uptake in R. pseudoacacia L. roots and stems increased, while the Pb content in the shoots of R. pseudoacacia L. under the combined Cd and Pb treatments decreased in relative to that in the single Pb treatments. The bacterial alpha-diversity indices (e.g., Sobs, Shannon, Simpson, Ace, and Chao) of R. pseudoacacia L. rhizosphere soil under Cd and Pb stress were changed slightly relative to the CK treatment. However, Cd and Pb stress could significantly (p < 0.05) alter the rhizosphere soil microbial communities. According to heat map and LEfSe (Linear discriminant analysis Effect Size) analysis, Bacillus, Sphingomonas, Terrabacter, Roseiflexaceae, Paenibacillus, and Myxococcaceae at the genus level were notably (p < 0.05) accumulated in the Cd- and/or Pb-contaminated soil. Furthermore, the MDA content was notably (p < 0.05) negatively correlated with the relative abundances of Isosphaeraceae, Gaiellales, and Gemmatimonas. The total biomass of R. pseudoacacia L. was positively (p < 0.05) correlated with the relative abundances of Xanthobacteraceae and Vicinamibacreraceae. Network analysis showed that Cd and Pb combined stress might enhance the modularization of bacterial networks in the R. pseudoacacia L. rhizosphere soil. Thus, the assembly of the soil bacterial communities in R. pseudoacacia L. rhizosphere may improve the tolerance of plants in response to Cd and/or Pb stress.
作者机构：
[王子钰; 周航; 周坤华; 谭文韬; 蒋毅; 唐棋; 伍港繁; 辜娇峰; Zeng, Peng; 廖柏寒] College of Environment Science and Engineering, Central South University of Forestry and Technology, Changsha;410004, China;Hunan Engineering Laboratory for Control of Rice Quality and Safety, Changsha;State Ecology Environment Key Laboratory of Monitoring for Heavy Metal Pollutants, Changsha;410019, China
期刊：
Science of The Total Environment,2022年818:151801 ISSN：0048-9697
通讯作者：
Hang Zhou
作者机构：
[Wei, Binyun; Liao, Bohan; Zeng, Peng; Gu, Jiaofeng; Zhou, Hang] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Peoples R China.;[Liao, Bohan; Zeng, Peng; Gu, Jiaofeng; Zhou, Hang] Cent South Univ Forestry & Technol, Hunan Engn Lab Control Rice Qual & Safety, Changsha 410004, Peoples R China.
通讯机构：
[Hang Zhou] C;College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China<&wdkj&>Hunan Engineering Laboratory for Control of Rice Quality and Safety, Central South University of Forestry and Technology, Changsha 410004, China
关键词：
Accumulation;Cd and As co-contaminated soil;Foliar spraying silicon;Rice;Water management
摘要：
Water management is an effective measure for the control of cadmium (Cd) and arsenic (As) in situ uptake and transport in rice. In this study, the effects of the co-application of foliar spraying silicon (Si) and water management on Cd and As uptake and transport in rice were studied under paddy soils that were seriously co-contaminated with Cd and As with a two-year field experiment. The results showed that the co-application of water management and foliar spraying Si could effectively decrease the bioavailability of Cd and As in soil and reduce the uptake and transport of Cd and As in rice. The co-application of water management and foliar spraying Si treatments decreased the exchangeable and TCLP extractable Cd and As contents in the soil. Especially for moisture at the maturing stage combined with foliar spraying Si treatment (MMS), the exchangeable and TCLP extractable Cd and As contents were significantly decreased by 48.49%-55.14% and 45.50%-54.67%, and 41.95%-56.73% and 37.80%-46.76% in the two seasons, respectively. The moisture at the maturing stage treatment significantly decreased the Cd and As contents in brown rice by 4426%-48.59% and 23.90%-38.16% in the two seasons relative to the control, respectively. Furthermore, MMS treatment simultaneously inhibited Cd and As transport and accumulation in rice among all co-application treatments. The translocation factor (TF)(stem-brown rice) of Cd, TFstem-leaf of As, and TFstem-brown rice of As values in the MMS treatment were significantly decreased as compared with the MM treatment. Furthermore, both the Cd and As contents in brown rice under the MMS treatment significantly decreased by 15.33%-30.74% and 33.84%-40.80%, respectively, in the two seasons. The results suggested that foliar spraying Si combined with moisture at the maturing stage might be a promising measure to synchronously inhibit the transport and accumulation of Cd and As in rice. (C) 2021 Elsevier B.V. All rights reserved.
作者机构：
[Qiu, Yin-Yan; Liao, Bo-Han; Tan, Wen-Tao; Zeng, Peng; Huo, Yang; Zhou, Hang; Gu, Jiao-Feng] College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China;[Liao, Bo-Han; Zeng, Peng; Zhou, Hang; Gu, Jiao-Feng] Hunan Engineering Laboratory for Control of Rice Quality and Safety, Changsha 410004, China
摘要：
Phosphorus (P) is an essential nutrient element for crop growth. The effects of P surplus or deficit on Cd absorption and transport in rice in Cd-polluted farmland is not clear. The effects of P deficiency and P sufficiency on Cd uptake, transport, and accumulation in rice under Cd stress were investigated by applying different levels of phosphorus (NaH(2)PO(4)) in a hydroponic experiment. The results showed that:① with the increase in ρ(P) (1.5-48.0 mg·L(-1)), the biomass in all parts of the rice plants had no obvious change, and the contents of photosynthetic pigment (chlorophyll a, chlorophyll b, and carotenoid) firstly ascended and then descended; high concentrations of P inhibited the synthesis of photosynthetic pigments. ② Under Cd stress, when the P was deficient (1.5-6.0 mg·L(-1)) or sufficient (12.0-48.0 mg·L(-1)), the Cd content in different parts of the rice increased with the increase in P addition level, and the maximum increase in Cd content in brown rice was 132.1% and 191.2%, respectively. ③ The P/Cd of brown rice showed a piecewise decreasing rule under P deficiency and P sufficiency, and the Cd content in brown rice was significantly negatively correlated with P/Cd (P<0.01). These results indicated that elevating phosphorus concentration when rice was under both the conditions of P deficiency and P sufficiency could promote the uptake and transport of Cd by rice roots under Cd stress, thus increasing the accumulation of Cd in aboveground parts and the risk of excessive Cd in rice.
通讯机构：
[Gu, JF ] C;Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Peoples R China.
关键词：
Arsenic;Cadmium;Combined amendment;Rice quality;Soil health
摘要：
In situ remediation technology applied aims to not only decrease cadmium (Cd) and arsenic (As) uptake by rice but also improve soil health and rice quality in contaminated paddy soils. Here the effects of a combined amendment, consisting of limestone, iron powder, silicon fertilizer, and calcium-magnesium-phosphate fertilizer, with three application rates (0, 450, and 900gm(-2)) on soil health, rice root system, and brown rice quality were compared in moderately versus highly Cd and As co-contaminated paddy fields. After the amendment application, soil pH, cation exchange capacity, four kinds of soil enzyme activities increased (sucrase, urease, acid phosphatase, and catalase), and concentrations of leached Cd/As decreased, as measured by the DTPA (diethylene triamine pentaacetic acid) and TCLP (toxicity characteristic leaching procedure). Changes in the above soil indicators promoted soil health. In both fields, the dithionite-citrate-bicarbonate (DCB)-Fe and DCB-Mn concentration in iron plaque increased and root length became longer. Changes in the above root system indicators reduced the root system's absorption of Cd and As but increased that of nutrients. Under 900gm(-2) treatment, the Cd concentration in brown rice of two sites decreased by 55.8% and 28.9%, likewise inorganic As (iAs) decreased by 50.0% and 21.1%, whereas essential amino acids increased by 20.4% and 20.0%, respectively. Furthermore, the Cd and iAs concentrations in brown rice were <0.2mgkg(-1) (maximum contaminant level of Cd and iAs in the Chinese National Food Safety Standards GB2762-2017 for brown rice) under the 900gm(-2) in the moderately contaminated field. These results suggest the combined amendment can improve soil health and brown rice quality in the moderately and highly Cd- and As-co-contaminated paddy soils, offering potential eco-friendly and efficient remediation material for applications in such polluted paddy soils.
作者机构：
[唐棋; 伍港繁; 辜娇峰; 周航; Zeng, Peng; 廖柏寒] College of Environment Science and Engineering, Central South University of Forestry and Technology, Changsha;410004, China;Hunan Engineering Laboratory for Control of Rice Quality and Safety, Changsha;[唐棋; 伍港繁; 辜娇峰; 周航; Zeng, Peng; 廖柏寒] 410004, China;[辜娇峰; 周航; Zeng, Peng; 廖柏寒] 410004, China<&wdkj&>Hunan Engineering Laboratory for Control of Rice Quality and Safety, Changsha
