Relationships Between Characteristic of Soil Nutrients and Soil Texture and Moisture in Wind-Water Erosion Crisscross Region

Liudaogou watershed,located in wind-water erosion crisscross region on the Loess Plateau,has been chosen as the study area.And soil nutrient loss is serious and soil degeneration is obvious under the effect of wind-water erosion in this area.However,there are great differences between laws of soil degradation due to different land use types.Characteristic of soil nutrients of slope farmland and waste grassland was analyzed and correlation among characteristic of soil nutrients and soil texture and moisture was discussed.The results indicated that:(1)The contents of kinds of soil nutrients were relatively low,the contents of soil nutrients of surface layer were higher than that of the lower level and slope farmland was higher than waster grassland;meantime,the higher the ratio of the contents of surface soil nutrients to that of the lower level soil nutrients was,the worse the sustainable ability of supplying fertilizer was.(2)The law of the contents of soil nutrient of slope farmland was similar to the law of soil erosion of slope,that was,firstly it decreased and then increased from top of the slope to foot of that.(3)Soil moisture had a great impact on soil texture and was significantly negative correlation with organic carbon and total nitrogen,negative correlation with available nitrogen.(4)Soil nutrient content was related to the adsorption of soil texture,that was,the thinner particle was helpful to improve soil adsorption capacity,while,the adsorption capacity was also related to the proportion of soil particle composition and the mechanism need further be studied.