红壤丘陵区坡度与坡向对耕地土壤养分空间差异的影响  

Impacts of Slope Gradient and Slope Aspect on Soil Properties of Farmland in Red Soil Hilly Region

作　　者：陈冲[1] 周卫军[1] 郑超[1] 陈妙[1] 杨威[1] 

机构地区：[1]湖南农业大学资源环境学院,湖南长沙410128

出　　处：《湖南农业科学》2011年第12期53-56,共4页Hunan Agricultural Sciences

基　　金：国家科技支撑项目(2009BADC6B005);湖南省研究生科技创新基金项目

摘　　要：以湖南省平江县南江镇为例，采用野外调查采样、室内分析测定、统计分析等方法，结合数字地面模型（DEM）提取地面坡度和坡向，研究了红壤丘陵区不同坡度和坡向下耕地土壤养分空间的变化规律。结果表明：坡度和坡向对土壤pH值的影响不明显，红壤丘陵区耕地土壤有机质和全氮含量有随坡度增大而升高的趋势，但没有显著差异，阴坡显著高于阳坡；土壤碱解氮含量在0～5°和5°～10°坡度的显著高于10°～15°和15°-20°坡度的，且阴坡高于阳坡；土壤全磷和有效磷含量有随坡度增大而下降的趋势，0～5°坡度的显著高于其他坡度的，且阳坡显著高于阴坡；土壤全钾含量不随坡度和坡向而变化，但速效钾含量有显著差异。The variation rules of soil properties in farmlands with different slope gradients and slope aspects in Nanjiang Town, Pingjiang County, Hunan Province, red soft hilly area, Were studied by field sampling, laboratory analysis, statistical analysis, and the slope gradient and slope aspect were determined by digital terrain model （DTM）. The results showed that the contents of soil organic matter and total nitrogen increased with increase of slope gradient, but there were no significant differences, while that in south-facing slope land was significantly higher than that in north- facing slope land in red soil hilly region; slope gradient and slope aspect had no obvious impact on soil pH value; the content of soil alkali-hydrolysable nitrogen in slope with 0~5~ or 5-10~ was significantly higher than that in slope with 10-15~ and 15-20~, while that in north-facing slope land was higher than that in south-facing slope land; the contents of soil total phosphorus （P） and available P decreased with increase of slope gradient, that in slope with 0-5~ were markedly higher than that in slope with other three gradients, while that in south-facing slope land were significantly higher than that in north-facing slope land; the soil total K content not changed with different slope gradients and slope aspects, but the soil available K content changed significantly.

关 键 词：微地形 坡度坡向 土壤养分 空间差异 红壤 丘陵区 

分 类 号：S155.44[农业科学—土壤学]