绿洲棉田土壤质量评价指标研究

Research on Evaluating Soil Quality Indicator in Oasis Cotton Field

[目的]确定绿洲棉田土壤管理、评价和施肥的合理措施。[方法]设计绿洲棉田土壤质量评价指标以土壤肥力功能为主,结合土壤生物指标进行分组评价,通过系统聚类分析法,对9个典型的棉田样本进行土壤质量评价指标的筛选和评价。[结果]评价组Ⅰ基本符合兵团生产分类目的。在不同类别样本中土壤条件差异性评价的衡量指标也不同,选定指标中第3类指标碱解氮、速效钾、细菌数量相对变化差异大。[结论]绿洲棉田土壤质量评价可采用指标土壤全氮、全磷、全钾和土壤有机质作为高、中、低产棉田划分的主要依据,并且呈现出低产棉田中土壤全量养分含量、中产棉田中速效养分和盐分含量、高产棉田中微生物数量差异变化相对较大的规律。

[ Objective] The reasonable measures for the oasis cotton field soil was identified to manage, appraise and apply fertilizer. [ Method] Evaluated indicators for the oasis cotton field soil quality were designed mainly by soil fertility function. Combining the soil organisms＇ indicators, the grouping evaluation was carried on. With system cluster analytic method,9 typical cotton field samples were chosen to select and evaluate the soil quality indicator. [ Resuit] The evaluated group Ⅰ conformed to the classified goal of the preduction basically. Appraisal target was also different in the different category sample. Choosing the third-sort indicator, the difference of quantity of alkaline hydrolysis nitrogen, the fast-acting potassium, and the bacterium was bigger. [ Conclusion]The indicators of soil entire nitrogen, entire phosphorus, entire potassium and soil organic substance could be used to divide the high, the middle and the low productivity cotton field. And the large variance showed in the soil total nutrient content of the low productivity cotton field, the available nutrient and the salinity content of the middle productivity cotton field, the microorganism quantity of the high production cotton field.