陕北黄土地貌正负地形坡度组合研究

Slope Spectrum of Positive and Negative Terrains of Loess Plateau in Northern Shaanxi Province

以沟沿线为分界线的黄土正负地形,是黄土地貌的基本特征,其中正负地形的坡面特征差异在黄土高原呈现一定的空间分异规律.本文以5 m分辨率DEM为基本信息源,以自动提取的陕北黄土高原正负地形为依据,通过坡谱对比分析,研究陕北黄土高原不同地貌类型区正负地形的地面坡度组合特征.研究结果显示,在陕北黄土高原不同地貌类型区,其正负地形在所提取的坡谱曲线、坡谱偏度、平均坡度差、坡谱信息熵等一系列指标上有显著的差异.而且这种差异的空间分异呈现一定的规律性,在一定程度上反映了地面的破碎程度与发育程度.

Divided by the zigzag loess shoulder-lines, the loess plateau presents two main kinds of terrains, which are named positive and negative terrains. The slope characteristic differences of positive and negative terrains show specific spatial variation patterns. Taking 5 m grid resolution DEMs as main information source and the extracted positive and negative terrains as basic data, researches are done to reveal the slope spectrum characteristics of positive and negative terrains in different landform type areas. The results show that there exist significant differences between the loess positive and negative terrains of the different landform type areas in the aspect of the slope spectrum curves, skewness, average slope difference and slope spectrum entropy. Moreover, the spatial variation of the significant differences present a specific regularity, which reflect the crushing and development of the land surface to some extent.