科尔沁沙地不同生态系统土壤钾素分布特征分析OA北大核心CSTPCD

In order to explore the distribution characteristics of soil potassium in different ecosystems of sandy land,the total potassium and available potassium contents of forest,farmland,grassland and bare land ecosystems in Horqin sandy land were analyzed by conventional agricultural chemistry method and one-way analysis of variance.The research results show that the soil available potassium content gradually decreases with the increase of soil depth,and the soil available potassium content in the 0-10 cm soil layer gradually decreases from spring to autumn,and the forest soil available potassium contentss the largest.The growth of young forest stands can promote the accumulation of soil potassium,while the growth of overmature forest stands will inhibit the accumulation of soil potassium.Compared with the bare land,the maximum total potassium content of farmland and grassland increase by 61.82%and 51.71%,respectively.With the growth of plants,the potassium content in the soil of forest,farmland and grassland ecosystem gradually decrease,and the potassium content of bare soil do not change significantly with time.The results of this study provide a theoretical basis for the restoration and management of degraded ecosystems in sandy land.