摘要
通过实验室培养试验,研究了铜与草甘膦单一污染和复合污染对水稻土中淀粉酶、脲酶、磷酸酶和过氧化氢酶活性的影响。结果表明,铜与草甘膦单一和复合污染对土壤中4种酶活性的影响效果明显不同。当铜单一污染时,抑制淀粉酶、脲酶、磷酸酶的活性,对过氧化氢酶活性的影响是低浓度激活高浓度抑制;而草甘膦单一污染时,对4种酶活性的影响是:激活淀粉酶和脲酶,抑制过氧化氢酶,对磷酸酶活性的影响则是低浓度激活高浓度抑制。铜和草甘膦复合污染,显著改变了铜或草甘磷单一污染对土壤酶的毒性效应。即复合污染对过氧化氢酶的毒性大于单一污染;对淀粉酶、脲酶和磷酸酶的毒性,小于铜单一污染,但大于草甘磷。方差分析结果表明,不同铜浓度间和不同草甘膦浓度间4种酶活性差异均达到极显著水平(P<0.01);铜和草甘膦互作浓度间,淀粉酶和脲酶活性差异分别达到了显著水平和极显著水平,其他2种酶活性差异不显著。
The effects of both single and combined pollution of Cu and glyphosate on the activities of amylase, urease, phosphatase and catalase in paddy soil were studied under laboratory incubation condition. The results showed that there existed significant differences in effects of between single and combined pollution on soil enzyme activity. When the soils were treated with Cu, the activities of amylase, urease and phosphatase were inhibited; the catalase activity was stimulated with low concentration of Cu while inhibited with high concentration of Cu. When the soils were treated with glyphosate, the activities of amylase and urease were stimulated, the activity of eatalase was inhibited, and phosphatase activity was stimulated at low concentration of glyphosate while inhibited at high concentration of glyphosate. It was found that there was a significantly interaction between Cu and glyphosate in case of combined pollution. The toxicity effect on catalase activity followed the order of combined pollution of Cu and glyphosate〉glyphosate〉Cu. The toxicity effects on the activities of amylase, urease and phosphatase followed the order： Cu〉combined pollution of Cu and glyphosate〉glyphosate. Analysis of variance also indicated that there were significant differences in soil enzyme activities in the contents of Cu or glyphosate（P〈0.01 ）. Between the interaction of Cu and glyphosate, the difference of amylase and urease was extremely significant, and the difference of phosphatase and eatalase was not significant.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2009年第1期84-88,共5页
Journal of Agro-Environment Science
基金
安徽省科技攻关计划(07010302212)
安徽省优秀青年科技基金(06041082)
关键词
铜
草甘膦
复合污染
酶活性
Cu
glyphosate
combined pollution
enzyme activity
