生物调理剂对土壤镉活性的影响研究  

Effects of Bio-Conditioner on Cadmium Bio-Availability in Soil

作　　者：易皓岚 刘维[1] 杨志辉 侍维 廖骐 YI Hao-lan;LIU Wei;YANG Zhi-hui;SHI Wei;LIAO qi(Department of Mineral Processing and Bioengineering,Central South University,Changsha 410083,PRC;Department of Metallurgy and Environment,Central South University,Changsha 410083,PRC)

机构地区：[1]中南大学资源加工与生物工程学院,湖南长沙410083 [2]中南大学冶金与环境学院,湖南长沙410083

出　　处：《湖南农业科学》2019年第5期37-42,共6页Hunan Agricultural Sciences

基　　金：湖南省重金属污染耕地修复及农作物种植结构调整试点课题(湘农财指〔2016〕130)

摘　　要：我国工农业的迅速发展,对土壤环境造成了不同程度的镉污染,农田土壤镉污染治理已经引起全球的高度重视。选取一种降低重金属生物有效性的新型生物调理剂,采用室内培养试验研究其对土壤镉活性及形态的影响。结果表明:生物调理剂中富里酸和溶解性有机物质(DOM)含量高达129.65和202.4g/L,且微生物群落结构丰富,其中以芽孢八叠球菌属为主。生物调理剂加入到土壤后的前4周,土壤中水溶态及有效态镉含量随生物调理剂添加量的增加而降低,到第6周时低生物调理剂用量下(1%~2%)水溶态及有效镉含量升高,而高生物调理剂用量(6%~10%)水溶态及有效态镉含量下降,且形态分析表明高生物调理剂用量促进Cd向弱活性态转化。生物调理剂从土壤pH值、Eh值、DOM3方面影响土壤水溶态及有效态镉含量,研究结果为生物调理剂在农田镉污染治理中的应用提供科学依据。In this study, a new biological conditioner was chosen to investigate its effects on Cd bio-availability and transformation of different Cd fractions in soils by the pot experiments. The bio-conditioner contained 129.65 g/L of fulvic acid, 202.4 g/L of dissolved organic matter (DOM) and diversified microorganisms mainly including Sporosarcina. The results show that after bio-conditioner addition, the concentrations of water-soluble and available Cd in the soil decreased with the increase of bio-conditioner in the first four weeks. In the sixth week, the concentrations of water-soluble and available Cd increased at low biological conditioner dosages (1%-2%), but decreased at high biological conditioner dosages (6%-10%). Meantime, the increase of bio-conditioner promoted the transformation of Cd to weak active fraction. The effect of bio-conditioner on water-soluble and available Cd in the soil was contributed to the varying pH, Eh, and DOM. The results could provide a scientific basis for the remediation of Cd-contaminated arable soil with bio-conditioner.

关 键 词：土壤镉污染 镉活性 生物调理剂 

分 类 号：X53[环境科学与工程—环境工程]