摘要
对江苏省昆山市不同种植年限菜地土壤基本性质和重金属含量的研究表明:研究区内菜地土壤酸化明显,且随着种植年限的增加酸化加剧,其中又以上层土壤酸化明显。随着种植年限的增加,菜地土壤有机质含量呈下降趋势,CEC略有升高,土壤中,<0.005mm,<0.01mm,<0.05mm颗粒含量呈上升趋势。从重金属全量看,菜地土壤以Hg污染最为严重。随着种植年限的增加,菜地土壤Hg,As,Cr和Ni含量呈下降趋势,以Hg在种植10年后下降明显,而Cu,Pb,Zn和Cd的含量随着种植年限的增加先升高,后下降。总的趋势是菜地种植的前5年重,金属含量相对较高,而10年后相对较低,这表明,在一定程度上增加了菜地所种蔬菜的重金属含量。
The study results on the changes of basic property and heavy metal conterlts in vegetable soils with different planting years in Kunshan city of southern Jiangsu province showed as follows： vegetable soil acidification was obvious in the tested field and got worse with the increasing of plan ring years; the pH of topsoil was lower than that of subsoil. With the increasing of plan ting years, the content of organic matter was in downtrend while CEC and the content of soil particles of less than 0. 005mm, 0.01ram and 0. 05mm were in uptrend. Hg was the main pollutant among several heavy metals in vegetable soil from the view of total content of heavy metals. The contents of Hg, As, Cr and Ni were in downtrend with the increasing of planting year; the content of Hg declined obviously after planting 10 years, while the contents of Cu, Pb, Zn and Cd increased firstly then went down with the increasing of planting years. The general trend was that the contents of heavy metals were relatively high in the first 5 planting years and low after 10 planting years, indicating the heavy metals were probably absorbed by vegetables.
出处
《河南农业科学》
CSCD
北大核心
2006年第11期79-82,共4页
Journal of Henan Agricultural Sciences
基金
国家重点基础研究发展规划(973)项目(2002CB410810)
关键词
菜地土壤
基本性质
重金属含量
昆山市
Vegetable soil
Basic property
Content of heavy metals
Kunshan city
