摘要
用实验室培养法研究了不同镉、铅和锌化合物对红壤中微生物生物量碳、氮和磷的影响。引起微生物生物量碳显著减少的Cd、Pb和Zn(均为氯化物 )临界土壤含量水平分别为 30、4 50和 2 0 0mg/kg。以醋酸盐形式加入土壤中的Cd、Pb和Zn对土壤微生物生物量比氯化物有更大的毒性 ,可能与其较高的溶解度有关。不管施用何种化合物 ,Cd、Pb和Zn对微生物量的相对毒性依次为 :Cd >Zn >Pb。
Laboratory incubation experiments were conducted to evaluate the toxicity of cadmium, lead, and zinc in the forms of acetates and chlorides to microbial biomass carbon, biomass nitrogen, and biomass phosphorus in a red soil. The critical levels of Cd, Pb,and Zn causing significant inhibition of microbial biomass carbon were 30,450,and 200mg/kg soil, respectively, when the metals were applied in the forms of chloride salts. The addition of Cd,Pb,and Zn in the form of acetate salts demonstrated a considerably greater biocidal effect on soil microbial biomass, because of higher solubility of acetate salts. The relative toxicity of the applied Cd, Pb, and Zn varied in the order: Cd>Zn>Pb, irrespective of their forms of compounds.
出处
《植物营养与肥料学报》
CAS
CSCD
2000年第1期69-74,共6页
Journal of Plant Nutrition and Fertilizers
基金
国家 973项目!(G19990118)
国家自然科学基金项目!(49671050)资助
关键词
镉
铅
锌
微生物生物量
红壤
碳
氮
磷
cadmium
lead
zinc
microbial biomass
red soil
carbon
nitrogen
phosphorus
