作者机构：
[陈珊; Zhou H.; 周航; 邓潇; 彭佩钦; 陈齐; 廖柏寒] College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China
通讯机构：
[Peng, P.] C;College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, China
作者机构：
[彭佩钦; 辜娇峰; 杨文弢; Zen M.; 周航; Zhou H.; 廖柏寒] College of Environment Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China
通讯机构：
[Liao, B.] C;College of Environment Science and Engineering, China
关键词：
复合改良剂;镉砷;形态分析;富集与转运;水稻;土壤
摘要：
为治理镉砷污染农田土壤,选取湘南某矿区镉砷复合污染稻田土壤,以水稻盆栽实验研究了复合改良剂HZB (羟基磷灰石+沸石+改性秸秆炭)对土壤中镉(Cd)、砷(As)赋存形态以及水稻累积转运Cd和As的影响。结果表明,施用HZB能提高土壤pH 0.19~0.79个单位,阳离子交换量增加22.1% ~ 60.4%;施用HZB使活性较大的酸提取态Cd含量降低了6.5% ~ 22.9%,促进了Cd向难溶态的转变,可使有机结合态Cd增加2.5% ~ 56.5%;施用HZB促进活性As向难溶型的钙型As转化,钙型As含量增加2.8% ~ 53.3%,也可使交换态As含量降低7.0% ~ 39.5%,但当施用量超过4.0 g kg~(-1)时则会增加交换态As含量。水稻根系对Cd的富集系数在0.65 ~ 1.21之间,对As的富集系数在0.033 ~ 0.049之间,富集Cd的能力大于As;谷壳对Cd的转运能力最大,而根系对As的转运能力最大;施用HZB有降低水稻根系富集Cd和As的能力。施用0.5 ~ 2.0 g kg~(-1)的HZB能降低水稻地上各部位中Cd和As含量;在2 g kg~(-1)施用水平,水稻糙米中Cd和As含量均低于0.2mg kg~(-1),达到国家食品污染物限量标准。
作者机构：
[姚庆鑫; 谢建军; 赵玉双; 宋文淼; 成青] School of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha;410004, China;[张平] School of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha;[姚庆鑫; 谢建军; 赵玉双; 宋文淼; 成青; 张平] 410004, China
通讯机构：
[Xie, J.] S;School of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha, China
摘要：
Aquatic macrophytes are considered to be promising in controlling harmful cyanobacterial blooms. In this research, an aqueous extract of Sagittaria trifolia tubers was prepared to study its inhibitory effect on Microcystis aeruginosa in the laboratory. Several physiological indices of M. aeruginosa, in response to the environmental stress, were analyzed. Results showed that S. trifolia tuber aqueous extract significantly inhibited the growth of M. aeruginosa in a concentration-dependent way. The highest inhibition rate reached 90% after 6 day treatment. The Chlorophyll-a concentration of M. aeruginosa cells decreased from 343.1 to314.2 μg/L in the treatment group. The activities of superoxide dismutase and peroxidase and the content of reduced glutathione in M. aeruginosa cells initially increased as a response to the oxidative stress posed by S. trifolia tuber aqueous extract, but then decreased as time prolonged. The lipid peroxidation damage of the cyanobacterial cell membranes was reflected by the malondialdehyde level, which was notably higher in the treatment group compared with the controls. It was concluded that the oxidative damage of M. aeruginosa induced by S.trifolia tuber aqueous extract might be one of the mechanisms for the inhibitory effects.
作者机构：
[辜娇峰; 周航; 张平; 彭佩钦; 廖柏寒] College of Environment Science and Engineering, Central South University of Forestry and Technology, Changsha;410004, China;[杨文弢] College of Bioscience and Technology, Hunan Agricultural University, Changsha;410128, China;[辜娇峰; 周航; 张平; 彭佩钦; 廖柏寒] 410004, China
作者机构：
[吴玉俊; 周航; 杨文弢; 邹紫今; 朱维; 辜娇峰; 彭佩钦; 张平; Zeng, Min; 廖柏寒] College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha;410004, China;[吴玉俊; 周航; 杨文弢; 邹紫今; 朱维; 辜娇峰; 彭佩钦; 张平; Zeng, Min; 廖柏寒] 410004, China
作者机构：
[陈全超; 耿勤; 李科林; 冉宇光; 张平; 廖柏寒] Institute of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China
通讯机构：
[Zhang, P.] I;Institute of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, China
作者机构：
[张平; 李科林; Qiu Y.; 廖柏寒] Institute of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
通讯机构：
[Zhang, P.] I;Institute of Environmental Science and Engineering, Central South University of Forestry and Technology, China
