摘要
为探寻合理的土地利用方式,减轻重金属污染,以上海市崇明岛为研究对象,结合室内盆栽模拟试验,研究了不同土地利用方式下Cd、Pb复合污染对土壤酶活性的影响,以期为合理规划土地功能和提高土壤健康程度提供科学依据。试验结果表明,农田、生活用地等受人类活动影响较明显的地区,其土壤酶活性低于湿地、林地、河道旁等人为扰动较少且水分充足的地区;土壤脲酶、磷酸酶和脱氢酶活性两两之间呈显著正相关(P<0.01),且土壤脲酶对Cd、Pb较敏感;土壤有机质与土壤酶活性呈显著正相关(P<0.05);Cd、Pb复合污染在低含量(Cd:0～1mg.kg-1;Pb:0～60mg.kg-1)时对土壤酶活性表现为促进作用,而高含量(Cd:0～20mg.kg-1;Pb:0～100mg.kg-1)时则表现为抑制作用。
In order to explore how to rationalize the use of land polluted by heavy metals, coupled with an indoor pot experiment, a field experiment was carried out on Chongming Island, Shanghai to study effects of combined pollution of Cd and Pb on soil enzyme activity under different types of land use. Results show that the soil enzyme activity is lower in farms, residential areas and some other lands seriously affected by human activities than in wetlands, forest lands and riversides and lands which are rich in water supply and less disturbed by human activities. Significant positive correlations were observed hetween soil urease, phosphatase and dehydrogenase in activity （P〈0. 01 ） , and soil urease was rather sensitive to Cd and Pb. Soil enzyme activity was also found to be positively related to organic matter （P〈0. 05）. At low concentration, combined pollution of Cd and Pb showed a positive effect on soil enzyme activity, while at high concentration a negative impact.
出处
《生态与农村环境学报》
CAS
CSSCI
CSCD
北大核心
2010年第2期167-173,共7页
Journal of Ecology and Rural Environment
基金
国家高技术研究发展规划(2007AA10Z441)
上海市科委项目(07JC14025
07DZ12055)
