Impact Factor:6.291
DOI number:10.1016/j.ecoenv.2020.110908
Affiliation of Author(s):Central South University
Teaching and Research Group:生物工程系
Journal:Ecotoxicology and Environmental Safety
Abstract:Chinese milk vetch is an effcient approach to reduce Cd accumulation in rice, nevertheless, its reduction mechanism is not well understood. In this study, we investigated the rice grain Cd, soil properties and microbial community in a Cd-polluted paddy feld amended with milk vetch residue (MV) or without (CK) during rice growth period. We found that milk vetch residue averagely decreased the Cd content in rice grain by 45%. Decrease of Cd in rice mainly attributed to the inhibition of Cd activation by milk vetch residue at heading stage probably by the formation of HA-Cd (Humic Acid) and CdS. Increased pH and organic matter (OM) promoted the reduction of available Cd. In addition, nonmetric multidimensional scaling (NMDS) analysis revealed that microbial community structure was signifcantly different between MV and CK treatment (r ¼ 0.187, p ¼ 0.002), and the core functions of differentially abundant genera were mainly associated with N-cycling, organic matter degradation and sulfate-reducing. The application of milk vetch residue increased the abundance of sulfatereducing bacteria (SRB) by 8–112% during the rice growth period, which may involve in promoting the transformation of Cd to a more stably residual Cd (CdS). Canonical correspondence analysis (CCA) and mantel test analysis indicated that available K (p ¼ 0.004) and available N (p ¼ 0.005) were the key environmental factors of shaping the SRB. Altogether, changes in soil properties affected microbial structure and functional characteristics, especially the response of SRB in MV treatment would provide valuable insights into reducing the bioavailability of Cd in soil.
Co-author:Yan Deng, Shaodong Fu, Menglong Xu, Ping Zhu, Yili Liang, Huaqun Yin, Luhua Jiang, Lianyang Bai, Xueduan Liu, Huidan Jiang, Hongwei Liu*
First Author:Siyuan Zhang
Indexed by:Journal paper
Document Type:J
Volume:202
ISSN No.:0147-6513
Translation or Not:no
Included Journals:SCI