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镉污染中性土壤伴矿景天修复的硫强化及其微生物效应
吴广美1, 王青玲1, 胡鹏杰1, 杨钰莹1, 董 蓓1, 张绪美2, 沈文忠2, 吴龙华1, 骆永明1
1.中国科学院土壤环境与污染修复重点实验室(南京土壤研究所),农田土壤污染防控与修复技术国家工程实验室;2.太仓市农业技术推广中心
摘要:
采用田间微区试验研究了施硫处理对中性镉污染农田上伴矿景天镉吸取修复效率、土壤pH、有效态镉、有效态硫以及微生物群落变化的影响。结果发现:土壤pH随时间和硫用量的增加而显著下降,有效态镉和有效态硫含量随时间和硫用量的增加而显著增加。在360 g/m2硫处理下,伴矿景天地上部镉含量为70.9 mg/kg,较不施硫对照(38.3 mg/kg)增加85.1%,耕层土壤全量镉去除率为19.4%,是对照(10.5%)的1.85倍。施硫处理150 d后,土壤ThiomonasRhodanobacter细菌相对丰度显著高于试验前土壤和对照处理。本试验结果表明,中性土壤施加适量硫磺不仅可显著提高污染土壤中镉的生物有效性,也可通过调节与硫代谢相关的功能微生物,显著增强镉的植物吸取修复效率。
关键词:      伴矿景天  植物修复  微生物
DOI:10.13758/j.cnki.tr.2020.05.007
分类号:S19
基金项目:国家重点研发计划项目(2016YFD0801104)、江苏省科技计划项目(BE2017778)、苏州市产业技术创新专项农业科技创新项目(SNG2017076)和太仓市重点研发计划项目(TC2018SF06)资助。
Sulfur Assisted Cadmium Phytoextraction by Sedum Plumbizincicola and Its Effect on Microbial Community in Neutral Paddy Soil
WU Guangmei1, WANG Qingling1, HU Pengjie1, YANG Yuying1, DONG Bei1, ZHANG Xumei2, SHEN Wenzhong2, WU Longhua1, LUO Yongming1
1.Key Laboratory of Soil Environment and Pollution Remediation, National Engineering Laboratory of Soil Pollution Control and Remediation Technologies, Institute of Soil Science, Chinese Academy of Sciences;2.Taicang Agricultural Technology Extension Center
Abstract:
A field plot experiments was conducted to investigate the effects of sulfur(S) application on cadmium(Cd) phytoextraction by Sedum plumbizincicola, soil properties and microbial community in neutral paddy soil. The results showed that soil pH decreased while available Cd and available S increased with time and S dosages. The treatment of S at 360 g/m2 obtained Cd concentration of 70.9 mg/kg in shoots, which was enhanced by 85.1% compared to the control group (38.3 mg/kg). The removal rate of total Cd from surface soil was 19.4%, which was 1.85 times as high as that of the control group (10.5%). The relative abundance of Thiomonas and Rhodanobacter in soil treated with 360 g/m2 S at 150 day were significantly higher than those of natural and control groups. This study shows that adding appropriate amount of S to neutral soil can not only significantly improve Cd bioavailability in soil, but also enhance the efficiencies of phytoremediation by regulating the functional microorganisms related to S metabolism.
Key words:  Sulfur  Cadmium  Sedum plumbizincicola  Phytoremediation  Microorganisms

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