In order to explore effects of vegetation on nutrients in soils,nutrients characters of soils under natural grass,closed grass,abandoned lands,forest lands returned from farmlands and fixed sandy areas in Mu Us Desert...In order to explore effects of vegetation on nutrients in soils,nutrients characters of soils under natural grass,closed grass,abandoned lands,forest lands returned from farmlands and fixed sandy areas in Mu Us Desert were researched.The results indicated that vegetations in varied types have different effects on organic matter,total N,available N and available P,among which the first three were all higher in soils under closed grass,forest lands returned from farmlands,and fixed sandy lands than those under natural grass and abandoned lands.This was totally contrary with contents of available P in soil.In addition,nutrients in soils at 0-20 cm were more influenced by vegetation,than those at 20-60 cm,and Caragana Korshinskii proved better in improving nutrients in soils.展开更多
Soil erosion is the key factor leading to the degradation of tillage-layer quality,which directly threatens regional food and ecological security.To study the characteristics of soil structure,water retention capacity...Soil erosion is the key factor leading to the degradation of tillage-layer quality,which directly threatens regional food and ecological security.To study the characteristics of soil structure,water retention capacity,and nutrient changes in the tillage layer of purple soil sloping farmland under different erosion conditions,a shovel soil erosion test was performed to distinguish the factors that hinder the tillage-layer quality of sloping farmland under different erosion degrees.展开更多
基金Supported by Projects in the National Science&Technology Pillar Program during the Twelfth Five-Year Plan Period(2012BAD16B0202)National Natural Science Foundation of China(41171002)Scientific Research Foundation of Beijing Normal University
文摘In order to explore effects of vegetation on nutrients in soils,nutrients characters of soils under natural grass,closed grass,abandoned lands,forest lands returned from farmlands and fixed sandy areas in Mu Us Desert were researched.The results indicated that vegetations in varied types have different effects on organic matter,total N,available N and available P,among which the first three were all higher in soils under closed grass,forest lands returned from farmlands,and fixed sandy lands than those under natural grass and abandoned lands.This was totally contrary with contents of available P in soil.In addition,nutrients in soils at 0-20 cm were more influenced by vegetation,than those at 20-60 cm,and Caragana Korshinskii proved better in improving nutrients in soils.
基金supported by the National Natural Science Foundation of China(Grant No.41771310)
文摘Soil erosion is the key factor leading to the degradation of tillage-layer quality,which directly threatens regional food and ecological security.To study the characteristics of soil structure,water retention capacity,and nutrient changes in the tillage layer of purple soil sloping farmland under different erosion conditions,a shovel soil erosion test was performed to distinguish the factors that hinder the tillage-layer quality of sloping farmland under different erosion degrees.
