塔里木河上游典型绿洲连作棉田土壤酶活性与其理化性质的相关性分析

以新疆塔里木河上游阿拉尔垦区连作棉田为典型样区,采集了0—20cm表层的不同年限连作棉田的土样,分析了5种土壤酶活性和7种土壤理化性质,并结合通径分析讨论了各因子之间的关系。结果表明,不同耕作年限棉田土壤酶活性和理化性质差异性显著。通径分析显示全氮是影响该地区土壤酶活性的直接主导因子,pH值对土壤酶活性存在极显著负效应。土壤有机质、速效磷、速效钾以及土壤水分间接作用于土壤酶活性。土壤容重可能不是影响该地区土壤酶活性的主要因素。

Enzymatic Activities and Related Physicochemical Properties in Soils of Continuous Cropping Cotton Fields Within a Typical Oasis in Upper Reaches of Tarim River

Soil samples were collected at depth of 0—20cm from a number of continuous cropping cotton fields across the Aler reclamation area of the upper reaches of the Tarim River.Five soil enzymatic activities and seven soil physicochemical properties were analyzed and their relationships were investigated using path analysis.The results showed that the enzymatic and physicochemical properties differed significantly between the continuous cropping cotton fields of various ages.Path analysis showed that soil enzymatic activities were mainly affected by total nitrogen in the soil and were significantly negatively correlated with soil pH value.The other factors such as soil organic matter,available P,available K and soil moisture indirectly influenced the enzymatic activities.Soil bulk density was found irrelevant with enzymatic activities.