Effects of copper pollution on Trifolium repens growth and soil enzyme activities

Abstract

Abstract: The study with pot experiment showed that with increasing Cu concentration,soil urease,invertase,catalase and polyphenol oxidase activities decreased gradually.There was a significant correlation between Cu concentration and soil enzyme activities,with the correlated degree followed the order of invertase>polyphenol oxidase>urease>catalase.Under a fixed Cu concentration,soil enzyme activities changed with time,and the changes were different between high and low Cu concentrations,being increased slightly under low Cu concentration (<500 mg·kg^-1),but decreased gradually as Cu concentration increased (500～3 000 mg·kg^-1).Statistical analysis indicated that within the range of test Cu concentrations,the activities of test soil enzymes were significantly different among different Cu concentration (P<0.01),which was accorded with the seedlings growth status.Soil pH was decreased,while electric conductivity was increased with increasing Cu concentration (500～3 000 mg·kg^-1),but they were increased with time under a fixed Cu concentration,with significant difference among different Cu concentration (P<0.01).Soil pH and electric conductivity were highly related to soil enzyme activities,with the order of polyphenol oxidase>invertase>catalase>urease.The test soil enzyme activities could be used as the indices of soil environment quality.

Key words: Cu, Trifolium repens, Growth, Soil enzyme activity

CLC Number:

X132
X171.5

CHU Ling, WANG Youbao, DING Jiahong, LI Zheng, LIU Dengyi . Effects of copper pollution on Trifolium repens growth and soil enzyme activities[J]. Chinese Journal of Applied Ecology, 2005, 16(12): 2413-2417.

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