The Songnen typical black soil belt is distributed with black soil resources with high organic matter and high fertility.Long-term overloaded farming has led to a significant reduction in soil organic matter content.Therefore,it is of great significance to study the reserve of soil nutrient elements for the protection of black soil resources and national food security.The Songnen typical black soil belt was took as the research area,based on 1 057 field soil sample measured data,using geostatistical analysis and other methods,the spatial distribution characteristics and influencing factors of TC(total carbon),TN(total nitrogen)and TP(total phosphorus)soil in the 0～20 cm tillage layer were studied.The results show these as follows.The contents of soil TC,TN and TP in the Songnen typical black soil belt were 19.25,1.88 and 1.28 g/kg,respectively,which were higher than the national level.The high-density calorific value area and high aggregation areas of soil TC,TN and TP are mainly distributed in the northern part of the Songnen typical black soil belt,and TC,TN and TP showed a trend from north to south decrease.The spatial aggregation of C:N,C∶P and N:P is higher in the northern part of this region.The soil silt content was more than 30％,and the contents of TC,TN and TP were high,ranging from 6.86 to 74.74 g/kg,0.94 to 5.93 g/kg and 0.66 to 3.76 g/kg,respectively.The content of soil TC,TN and TP are greatly affected by soil pH,average annual temperature,average annual precipitation and topography and other factors.The research results can provide a scientific basis for the protection of black soil resources and sustainable agricultural development.
soil total carbonsoil total nitrogensoil total phosphorusspatial distributionSongnen typical black soil belt
维普
万方数据
