Temporal and Spatial Distribution Characteristics of Nitrogen and Phosphorus in Soil with Typical Crops Planted on in Headwater Region of Liao He

This paper discusses the temporal and spatial distribution of nitrogen, phosphorus in the soil with typical crops planted on in Headwater Region of Liao He. The purpose is to provide theoretical basis for the prediction of the non-point source pollution and protection of the environment in Headwater Region of Liao He. The results show that the content of the substance which can be absorbed by plants was higher in the surface soil than that in the bottom soil. The nitrate nitrogen content in soil was lower in autumn than that in spring except normal planting surface soil. And the ammonia nitrogen content was also a little lower in autumn than that in spring except normal planting surface soil and blank control land 1. In autumn, the hydrolyzable nitrogen content in the surface soil was decreased slightly and it was nearly unchanged in the bottom soil. The total nitrogen content was higher in autumn. The content of available phosphorus was a little higher or nearly unchanged in autumn than that in spring, the content of total phosphorus changed irregularly.