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土壤酶活性可以反映土壤生物化学过程的方向和强度。以新疆塔里木河上游阿拉尔垦区作为研究区域,选择8a棉田、30a棉田、人工林、天然林、荒草地、撂荒地及盐碱地等不同土地利用方式的样地为研究对象,综合考虑土壤理化和酶活性指标,对这两者的相关性进行深入探讨。结果表明:酶活性的较高值出现在绿洲内部的人工林、天然林和8a棉田,较低值出现在盐碱地和荒草地。由通径分析及决定系数可知,全氮是影响该地区酶活性的主导因子;速效磷对脲酶和转化酶存在显著的直接正效应,是影响脲酶和转化酶活性的主导因子;速效钾是影响过氧化氢酶和转化酶活性的重要因素。与简单相关或多元回归分析方法相比,通径分析能对土壤理化性质和土壤酶之间的关系进行更客观、全面地解释。
Soil enzyme activity can reflect the direction and intensity of soil biochemical processes. Taking the Alar Irrigated Area of the upper reaches of the Tarim River in Xinjiang as the research area, the authors selected 8 plots of cotton fields, 30 a cotton fields, artificial forests, natural forests, wasteland, fallow land and saline-alkali land for different land use patterns. Activity indicators, the relevance of these two in-depth discussion. The results showed that the higher values of enzyme activity appeared in the plantations, natural forests and 8a cotton fields in the oasis, and the lower values appeared in the saline-alkali land and the weeds. From the path analysis and determination coefficients, total nitrogen is the dominant factor affecting the enzyme activity in the region; available phosphorus has a significant direct positive effect on urease and invertase, which is the dominant factor affecting urease and invertase activity; An important factor in the activity of catalase and invertase. Compared with simple correlation or multiple regression analysis, path analysis can explain the relationship between soil physical and chemical properties and soil enzymes more objectively and comprehensively.