[Effects of copper pollution on Trifolium repens growth and soil enzyme activities].
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 x kg(-1)), but decreased gradually as Cu concentration increased (500-3000 mg x 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 (500-3000 mg x 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.
Chu
Ling
L
Anhui Normal University, Wuhu 241000, China. chuling7776@sina.com
Wang
Youbao
Y
Ding
Jiahong
J
Li
Zheng
Z
Liu
Dengyi
D
D002374:Catalase / Q000378:metabolism; D004156:Catechol Oxidase / Q000378:metabolism; D003300:Copper / Q000633:toxicity*; D006863:Hydrogen-Ion Concentration; D012987:Soil / Q000032:analysis*; D012989:Soil Pollutants / Q000633:toxicity*; D029921:Trifolium / Q000201:enzymology*; D014510:Urease / Q000378:metabolism; D043324:beta-Fructofuranosidase / Q000378:metabolism*
D012987:Soil; D012989:Soil Pollutants; D003300:Copper; D004156:Catechol Oxidase; D002374:Catalase; D043324:beta-Fructofuranosidase; D014510:Urease