北京师范大学学报（自然科学版）2016，Vol.52Issue(4)：472-478,7.DOI:10.16360/j.cnki.jbnuns.2016.04.012
黄土高原大南沟小流域土壤养分空间分异特征∗
Spatial heterogeneity of soil nutrients in Danangou catchment in the Loess Plateau
摘要
Abstract
The amount and distribution of top soil nutrients,SOM,total N (TN),total P (TP),available N (AN),available P (AP)and available K (AK),in Danangou catchment of Ansai County,Shaanxi Province were analyzed by semivariogram of geostatistics, Kriging and IDW method. Soil nutrient in Danangou catchment was found to be generally low,the averages being 0.964% (SOM),0.506 g·kg-1 (TN),0.609 g· kg-1 (TP),41.295 mg·kg-1 (AN),2.009 mg·kg-1 (AP)and 138.506 mg·kg-1 (AK).The model of nutrient spatial distribution was as follows.TP was in accordance with exponential model,AP and AN were in accordance with spherical model. AK was in accordance with gaussian model. The range of spatial heterogeneity in decreasing order was TP (870 m),AP (724 m),AK (207 m)and AN (105 m).Spatial distribution of nutrient overall was:forest land>grassland>orchard land>woodland>farmland/bottom slope>upper slope.N showed continuous distribution because it was easy to leach,and was affected by artificial fertilization.Spatial heterogeneity of P was not strong since P was susceptible to soil parent materials and stable in soil.Available K was also easy to lose;its distribution had strong correlation with vegetation types.This work provides some scientific basis for land use pattern optimization in Danangou catchment and ecological degradation governance,represented by soil and water loss.关键词
大南沟流域/土壤养分/空间分异Key words
Danangou catchment/soil nutrient/spatial heterogeneity分类
农业科技引用本文复制引用
崔旭辉,郝羽,邱扬..黄土高原大南沟小流域土壤养分空间分异特征∗[J].北京师范大学学报（自然科学版）,2016,52(4):472-478,7.基金项目
国家自然科学基金资助项目(30970503,41171152) （30970503,41171152）
国家自然科学基金重大课题资助项目(41390462) （41390462）
