摘要
在连续盆栽水稻、小麦的过程中研究了加入黄棕壤的Cu、Cd、Pb的毒性(发光细菌法)。结果表明,当以水提取黄棕壤中三元素,浓度低,不显毒性,这与水提取红壤的结果相反;当以0.1mol L^(-1)HCI提取黄棕壤中三元素,则浓度明显提高而显示毒性。在相关显著水平P=0.001的基础上建立了土壤金属浓度与剩余发光度(毒性指标)优化拟合方程。规定含金属土壤的临界剩余发光度为90%(EC_(10))。据此,估算出黄棕壤中Pb、Cu、Cd的临界浓度(μg/g土)分别为:488—587,17.8—25.3,2.11—2.12。
The toxicity of yellow-brown earth added with Cu, Cd, or Pb was researched using the MICROTOX method in the process of successively growing of paddy and wheat in a pot experiment. It was confirmed that when three metal elements in yellowbrown earth were extracted by water, their concentrations were too low to display toxicity as contrasted with red soil; but when extracted by 0.1 mol L^(-1) HCI, their concentrations rose obviously and toxicity appeared.The optimum quasi-conjunction equation between metal's concentration in soil and its remanent luminosty (toxicity index) was founded on the basis of correlation significance at p=0.01 level. The critical remanent luminosity of soils containing metals was defind as 90%(EC_(10)). Accordingly, the critical concentrations of Pb, Cu and Cd in yellowbrown earth (grown with preceeding crop) were estimated to be 488—587, 17.8—25.3 and 1.11—2.12mg/kg soil, respectively.
出处
《土壤学报》
CAS
CSCD
北大核心
1992年第2期158-167,共10页
Acta Pedologica Sinica
