铅锌矿冶区土壤酶活性特征研究

分析测试了铅锌矿冶区Pb、Zn、Cu、Cd复合污染条件下的土壤酶活性，分析了土壤重金属污染状况与土壤酶活性的相关关系。结果表明，随着采样点偏离废气排放口主导风向程度增大，Pb、Zn、Cu、Cd综合污染指数PI逐渐降低，土壤蛋白酶、脲酶、过氧化氢酶的活性逐渐增高且差异显著，变化程度中大到小的顺序为蛋白酶→脲酶→过氧化氢酶。剖面分布上，综合污染指数PI〉5的样地，基本呈现随土壤深度增加而土壤酶活性降低的趋势。蛋白酶、脲酶、过氧化氢酶的活性间呈极显著正相关，3种土壤酶活性与全磷呈极显著正相关，与有机质相关性较低。蛋白酶、脲酶、过氧化氢酶等土壤酶活性分布特征对矿冶区污染程度和土壤生态系统特性具有一定的指示作用。

Characterization of soil enzyme activities in soils from lead-zine smeltery

Activities of selected soil enzymes including urease,proteinae,catalase,sucrase were determined in the area of the lead-zine smeltery and the relationship between the activities of soil enzymes and the index of heavy metal pollution were analyzed.Results showed that the prevailing wind played a key role in the distribution of soil pollution.while the distance of sampling sites away from the smeltery increased on the prevailing wind,the pollution index(PI) decreased obviously and the activities of soil en-zymes significantly increased and followed the order as proteinae > urease > catalase.The activities of soil enzymes decreased with the increase of soil depths where PI was more than 5.The activities of uease,proteinae and catalase were significantly and positively correlated.The activities of uease,proteinae and catalase and the total phosphorus in soil were significantly and positively correlated.The results imply that the activities of uease,proteinae and catalase should be used as an indicator for the pollution level in the area of the lead-zine smeltery.