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利用地统计学和GIS相结合的方法分析了哈尔滨市方正县德善村土壤养分空间异质性。采集土壤表层0～20cm土样51个,面积约50hm2。经常规化验分析和空间分析结果表明有机质变异系数<0.1为弱变异,全氮、速效氮、速效磷、速效钾在0.1~0.9之间为中等变异;土壤有机质、全氮、速效氮的理论模型均为球状模型;速效磷和速效钾理论模型为指数模型;有机质和全氮的C0/(C0+C)分别为8.3%、8.9%,说明这两种养分具有较强的空间相关性;速效氮、速效磷、速效钾的C0/(C0+C)分别为25%、49%、50%,具有中等空间相关性,其中速效磷和速效钾受随机性因子影响较大。本研究旨在为哈尔滨市土壤养分管理和平衡施肥提供科学依据。
Using the method of geostatistics and GIS, the spatial heterogeneity of soil nutrients in Dezen village, Founder County, Harbin was analyzed. Fifty soil samples with 0 ~ 20cm soil layer were collected and the area was about 50hm2. The results of routine laboratory analysis and spatial analysis showed that the coefficient of variation of organic matter was less than 0.1, and the variation of total nitrogen, available nitrogen, available phosphorus and available potassium was moderate among 0.1 ~ 0.9. The theoretical model of soil organic matter, total nitrogen and available nitrogen Both of them were spherical model. The theoretical model of available phosphorus and available potassium was exponential model. The C0 / (C0 + C) of organic matter and total nitrogen were 8.3% and 8.9% respectively, indicating that these two nutrients had strong spatial correlation. The C0 / (C0 + C) of available nitrogen, available phosphorus and available potassium were 25%, 49% and 50%, respectively. There was a moderate spatial correlation between available phosphorus and available potassium, which was greatly influenced by random factors. This study aims to provide a scientific basis for soil nutrient management and balanced fertilization in Harbin.