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污灌时间对土壤肥力及土壤酶活性的影响

Keywords: 污水灌溉,土壤肥力,土壤酶活性,重金属

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Abstract:

通过时空互代、野外调查和采样分析的方法,研究了石家庄栾城县不同污水灌溉时间下(0~52a)耕地土壤肥力及土壤酶活性特征。结果表明:与对照点相比,污水灌溉区土壤有机质、全氮、全磷含量,蔗糖酶、脲酶和磷酸酶活性均相对较高,而土壤阳离子交换量、过氧化氢酶和脱氢酶活性无明显的变化规律;污水灌溉区土壤全氮、蔗糖酶、磷酸酶与污灌时间之间表现出显著正相关性(P<0.05),其他指标与污灌时间之间均无显著相关性;土壤肥力(有机质和全氮)、重金属(总Cr和总Cd)与水解酶(脲酶和磷酸酶)之间表现出显著正相关性,交换态Cr与脱氢酶活性之间呈现出显著负相关性。上述特征反映了污水灌溉时间对土壤肥力及土壤酶活性具有复杂的影响效应,而这些效应是决定污水灌溉区土地生产力能否高产的重要因素。

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