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以塔里木河上游阿拉尔垦区为典型样区,选择0、3、8、12、20、30 a等不同连作年限棉田为研究对象,综合考虑土壤物理、化学和生物学性质,分析了12个土壤理化及酶活性指标;基于因子分析和聚类分析法评价棉田间土壤质量的差异并划分等级,利用产量持续指数验证评价结果。研究表明:不同连作年限的棉田土壤的理化性质和酶活性均存在一定差异;棉田的土壤质量随年限呈先上升后下降的趋势,8、12 a棉田土壤质量相对较高,20、30 a土壤质量有退化趋势;土壤质量评价值与产量持续指数变化趋势一致,后者略显滞后效应。
Taking the Aral Irrigated Area as a typical sample area in the upper reaches of the Tarim River, cotton fields of different continuous cropping years such as 0, 3, 8, 12, 20 and 30 a were selected as the research object. Considering the physical, chemical and biological properties of the soil, 12 soil Physical and chemical indicators and enzyme activity. Based on factor analysis and cluster analysis, the differences of soil quality among cotton fields were evaluated and classified into different grades. The results of continuous assessment of yield were validated. The results showed that there were some differences in the physicochemical properties and enzyme activities of soils in different continuous cropping years. The soil quality of cotton fields increased first and then decreased with age, and the soil quality was relatively high in 8 and 12 a cotton fields, There is a trend of degradation in quality; the trend of soil quality evaluation and production continuous index are the same, while the latter is slightly lagged.