摘要
黄土高原水蚀风蚀交错区在强烈的水蚀风蚀作用下,土壤养分流失严重,土壤退化明显。但不同的土地利用方式,这种退化规律有较大的差异。以位于黄土高原水蚀风蚀交错区的六道沟小流域为研究区,分析坡耕地和荒草坡地土壤养分特征,探讨土壤养分与土壤质地及水分的相关性。结果表明:(1)水蚀风蚀交错区各养分含量都较低,其养分含量表层均高于下层,坡耕地高于荒草地;土壤各养分上下层比值越大,土壤的供肥持续能力越差;(2)坡耕地土壤养分含量表现出与坡地水土流失相似的规律,从坡顶部到坡底呈现先减小后增大的趋势;(3)土壤水分含量影响土壤质地变化,并与土壤有机质和全氮关系最好,与有效态氮的关系较密切;(4)土壤养分含量与土壤质地的吸附作用有关,组成物质越细,吸附能力越强,但这种吸附能力还与不同粒级组成的比重有关,其机理有待于进一步研究。
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.
出处
《水土保持学报》
CSCD
北大核心
2012年第2期99-104,共6页
Journal of Soil and Water Conservation
基金
黄土高原土壤侵蚀与旱地农业国家重点实验室课题(10501-230
10502-Z12-1)
关键词
水蚀风蚀交错区
土壤粒级构成
土壤养分
利用类型
wind-water erosion crisscross region
soil particle composition
soil nutrients
use types
