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干旱区荒漠绿洲农田土壤肥力质量的研究是绿洲功能和生产力评价的一个重要方面。通过1982年和2008年临泽绿洲农田287个样点耕层土壤(0～20cm)有机质、全氮、碱解氮、速效磷和速效钾数据,利用地理信息系统和地统计学分析手段,研究了26a来土壤肥力质量的变化特征。结果表明,研究区土壤有机质、全氮、碱解氮、速效磷和速效钾的含量为13.8g.kg-1、0.81g.kg-1、64.4mg.kg-1、32.3mg.kg-1、199mg.kg-1,较1982年分别提高了13.5%、7.8%、9.3%、225.6%和26.8%;土壤肥力指标的变异性较大,变异系数均大于25%;模糊数学综合评价方法适合研究区土壤肥力质量评价,土壤肥力质量综合值由1982年的强度空间变异发展为中等空间变异;根据全国农业地力等级划分标准,研究区土壤属于4、5、6、7级,较1982年的土壤肥力呈上升趋势。土壤肥力综合值分布图可以为该区域土壤资源的合理利用提供理论依据。
The research on the soil fertility quality of desert oasis farmland in arid area is an important aspect of oasis function and productivity evaluation. Based on the data of organic matter, total nitrogen, available nitrogen, available phosphorus and available potassium in 287 soil layers (0 ~ 20cm) in Linze oasis farmland in 1982 and 2008, using the geographic information system and geostatistical analysis methods, 26a to fertility characteristics of soil fertility. The results showed that the contents of soil organic matter, total nitrogen, available nitrogen, available phosphorus and available potassium in the study area were 13.8g.kg-1, 0.81g.kg-1, 64.4mg.kg-1 and 32.3mg.kg-1 , 199mg.kg-1 respectively, which were 13.5%, 7.8%, 9.3%, 225.6% and 26.8% higher than that of 1982 respectively. The variability of soil fertility index was larger and the coefficient of variation was more than 25%. The fuzzy mathematics comprehensive evaluation method was suitable The soil fertility quality evaluation and soil fertility quality integrated value in the study area developed from intensity spatial variability in 1982 to medium spatial variability. According to the national classification standard of agricultural geotechnical grade, the soil in the study area belonged to Grade 4, 5, 6 and 7, Soil fertility is on the rise. The integrated map of soil fertility can provide a theoretical basis for the rational utilization of soil resources in this area.