摘要
利用地统计学和GIS相结合的方法分析了嫩江县土壤速效养分空间异质性。采集土壤表层0～20cm土样6900个，采集土地利用类型为耕地，面积约35．6万hm^2，进行化验分析和空间分析。结果表明：速效氮、速效磷、速效钾变异系数均在0．1～1．0，为中等变异；土壤速效磷的理论模型均为指数模型；速效氮和速效钾理论模型为球状模型；速效磷、速效钾的C0／（C0＋C）分别为49．9％、50．2％，在25％～75％，变量具有中等空间相关性，而速效氮的C0／（C0＋C）为79．5％，变量空间相关性较弱，表明土壤养分速效氮受随机性因子影响较大。
Geostatistics method and Geographic information systems （GIS） were introduced to study soil nutrient spatial heterogeneity in Nenjiang county of Heilongjiang province. 6 900 soil samples at the depth 0- 20 cm were collected over 356 000 hm^2 farmland and measured with routine chemical methods and spatial analysis. The results showed that the soil available N, available P and available K were medium variation, and the coefficients of variation （CV） were all between 0.1 and 0.9; The theoretic model of available P is exponent The theoretic models of available N and available K are spheroid; The ratios between C0 and C0 ＋C of available P and available K were 49.9% and 50.2%, between 25% and ：75%, respectively, which indicates the medium spatial correlation of these two nutrients; The ratios between C0 and C0 ＋C of available N was 79.5%, it indicates weak spatial correlation, and available N was strongly affected by random factors.
出处
《黑龙江农业科学》
2010年第3期38-41,共4页
Heilongjiang Agricultural Sciences
基金
"十一五"国家科技支撑计划资助项目(2006BAD05B05
2007BAD89B05)
关键词
空间异质性
黑土
土壤养分
地统计学
spatial heterogeneity
black soil
soil nutrients
geostatistics
