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研究县域农田空间变异特征可以为培肥地力,增加作物产量提供指导。本文运用地统计学和GIS相结合的方法,研究了四川省双流县土壤有机质的空间变异特征及其影响因素。结果表明:①研究区域土壤有机质含量处于中等偏高水平,平均值为29.72 g/kg,变异系数为30.11%,属中等变异强度。②有机质变异函数的理论最佳模型为球状模型,块金值与基台值之比为12.67%,表明有机质含量具有强烈的空间相关性,空间相关距离为91.10 km,普通Kriging插值表明土壤有机质含量呈现北部向东南部减少的趋势。③影响有机质空间变异的主要因素为土壤类型、地貌类型等结构性因子,而土地利用方式、施肥等随机性因子也对有机质空间变异产生重要影响,其中秸秆还田是有机质含量普遍升高的原因。
Studying the characteristics of farmland spatial variability at county level can provide guidance for improving soil fertility and increasing crop yield. In this paper, the combination of geostatistics and GIS methods to study the spatial variability of soil organic matter and its influencing factors in Shuangliu County, Sichuan Province. The results showed that: ①The content of soil organic matter was moderately high in the study area, with an average of 29.72 g / kg and a coefficient of variation of 30.11%, which belonged to medium intensity of variation. ② The theoretical model of organic matter variability is the spherical model. The ratio of the gold value to the abutment value is 12.67%, indicating that the organic matter content has a strong spatial correlation with a spatial correlation distance of 91.10 km. Ordinary Kriging interpolation indicates that the content of soil organic matter Showing the north to the southeast trend of reduction. (3) The main factors affecting the spatial variability of organic matter are structural factors such as soil types and landform types. Random factors such as land use patterns and fertilization also have an important effect on the spatial variability of organic matter, of which straw is the main reason for the increase of organic matter content .