Abstract: Based on the distribution of plant population on Songnen alkaline grassland and ecofogica environmental characters affecting the pattern of plant population distribution, this paper proposes an approach to analyzing the relationship between plant population and soil nutrition on alkaline grassland, which is called as soil nutrient field analysis. The methods measuring and calculating soil nutrient field has put forward,selection of the parameter of soil nutrient field efficiency as well as disposal methods of soil data on soil nutriment axis is discussed in this paper, too.

Key words: Soil nutrient field, Alkaline grassland, Plant population distributioni, Soil nutrition