论文部分内容阅读
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。
The micro-topography formed under the three kinds of farming practices commonly used in the Loess Plateau was studied as artificial hoeing (AH), artificial digging (AD) and contour tillage (CT). The test slopes were 5 °, 15 °, 25 ° and rainfall intensity of 60 mm / h. Based on the establishment of different micro-topographic digital elevation models (M-DEMs) by GIS technology, the spatial complexity features and their changes were studied by combining with the elevation banding method. The results showed that: (1) The surface roughness under different tillage measures was CT> AD> AH; (2) The rainfall process had a significant effect on the micro-relief. Before the rain, the micro relief topography under different tillage measures was AD> AH> CT. After 90 minutes of rain, the micro relief topography was CT> AD> AH. (3) The micro-topographic gully depth, elevation variation coefficient and micro-topography fluctuation are similar. On the basis of establishing M-DEM, elevation banding method is an effective way to quantitatively study the micro-topography complexity under different tillage measures.