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采用地理信息系统(G IS)和地统计学相结合的方法研究了本世纪初东北黑土区土壤表层(0~20 cm)pH、有机质、速效磷、速效钾、粘粒这5种土壤肥力指标的空间变异性。结果表明:土壤pH和粘粒的理论模型均为指数模型;有机质、速效磷和速效钾的理论模型均为球状模型。速效磷、速效钾的C0/(C0+C)较大,为46.63%和49.91%,说明这2种肥力指标具有中等的空间相关性;而pH、有机质、粘粒的C0/(C0+C)分别为10.80%、16.57%、12.88%,说明这3种肥力指标具有较强的空间相关性。根据每个采样点的指标数据计算出该地区土壤肥力质量综合评价指数,最终得到研究区土壤肥力质量的分布图。
Using the method of Geographic Information System (GIS) and geostatistics, this paper studied the soil fertility indexes of soil surface (0 ~ 20 cm), organic matter, available phosphorus, available potassium and clay in the black soil region of Northeast China in the beginning of this century Spatial variability. The results show that both the theoretical model of soil pH and clay are exponential model, and the theoretical model of organic matter, available phosphorus and available potassium are spherical model. The C0 / (C0 + C) of available P and available K were large, which were 46.63% and 49.91%, respectively, indicating that these two kinds of fertility indices had a moderate spatial correlation. ) Were 10.80%, 16.57% and 12.88%, respectively, indicating that these three kinds of fertility indexes have strong spatial correlation. According to the index data of each sampling point, the comprehensive evaluation index of soil fertility quality in this area was calculated, finally the distribution of soil fertility quality in the study area was obtained.