Intercropping of Sonchus asper and Vicia faba affects plant cadmium accumulation and root responses  

作　　者：Yanqun ZU Li QIN Fangdong ZHAN Jiong WU Yuan LI Jianjun CHEN Jixiu WANG Wenyou HU 

机构地区：[1]College of Resources and Environment,Yunnan Agricultural University,Kunming 650201(China) [2]Institute of Soil Science,Chinese Academy of Sciences,Nanjing 210008(China)

出　　处：《Pedosphere》2020年第4期457-465,共9页土壤圈（英文版）

基　　金：This research was supported by the Yunnan Provin-cial Key Research and Development Project,China(No.2019BC001-04);the National Natural Science Foun-dation of China(No.41867055).

摘　　要：The cadmium(Cd)pollution of farmland soil is serious in the world.The present study investigated the effects of intercropping Vicia faba and the hyperaccumulator Sonchus asper on the Cd accumulation and root responses(morphology and secreted organic acids)of plants grown on soil from a mining area in Yunnan Province,China,under different Cd stress levels(0,50,100,and 200 mg kg-1).Intercropping increased the biomass of both S.asper and V.faba,as well as the Cd accumulation and Cd transfer coefficient from roots to shoots of S.asper,but decreased those of V.faba in the 200 mg kg-1Cd treatment.The Cd concentrations in roots,shoots,and grains from intercropped V.faba plants were positively correlated(P<0.05)with the N,N-diethyl phenylacetamide-extractable Cd content in soil.In the 50 mg kg-1Cd treatment,intercropping decreased citric and malic acids in root secretions of S.asper.Intercropped V.faba secreted more citric,oxalic,acetic,and malic acid compared with S.asper.Intercropping also increased root length and root surface area of both S.asper and V.faba.At 50 mg kg-1Cd,root length for S.asper was higher than that at 0 mg kg-1Cd,whereas V.faba roots had significantly decreased length and mean diameter.Intercropping of S.asper and V.faba is suggested as an in situ phytoremediation strategy of Cd-contaminated soils and may improve the food quality of V.faba.

关 键 词：organic acid PHYTOREMEDIATION root length root surface area transfer coefficient 

分 类 号：X173[环境科学与工程—环境科学]