摘要
以黄土高原普遍采用的3种耕作措施下形成的微地形为研究对象,即人工锄耕(AH)、人工掏挖(AD)和等高耕作(CT),试验坡度为5°,15°,25°,试验雨强为60mm/h,通过GIS技术建立不同微地形数字高程模型(M-DEM)的基础上,结合高程条带法对其空间复杂度特征及其变化进行研究。结果表明:(1)不同耕作措施下的地表粗糙度大小依次为CT>AD>AH;(2)降雨过程对微地形起伏度有显著影响。在降雨之前不同耕作措施下的微地形起伏度大小依次为AD>AH>CT,而在90min雨后,微地形起伏度大小依次为CT>AD>AH。(3)微地形沟壑深度、高程变异系数与微地形起伏度的变化规律相似。在建立M-DEM的基础上,高程条带法是定量研究不同耕作措施下坡面微地形复杂度特征的有效途径。
In this paper,the combination of M-DEM based on GIS and swath profile methodology was applied to analyze spatial complexity characteristics of micro-topography under different tillage practices artificial dig,artificial hoe and contour tillage with slope of 5°,15°,25°and rainfall intensity of 60mm/h.The result showed that:(1)The descending order of roughness under different tillage practices was contour tillage,artificial dig and artificial hoe.(2)Rainfall had a significant effect on the micro-terrain,the descending order of changes of the micro-relief under different tillage practices was artificial dig,artificial hoe and contour tillage,but the descending order of changes of the micro-relief was contour tillage,artificial dig and artificial hoe after rainfall with 90min.(3)The earth's gully depth and variance coefficient in elevation of micro-topography under different tillage practices was in consist with micro-relief order.Swath profile methodology could be a significant solution to research micro-topography complexity characteristic quantitatively based on GIS.
出处
《水土保持学报》
CSCD
北大核心
2013年第4期152-156,共5页
Journal of Soil and Water Conservation
基金
国家自然科学基金项目(41271288)
