陇东地区残塬分布规律及影响因素分析

doi:10.16232/j.cnki.1001-4179.2019.08.011

摘要/Abstract

摘要： 沟道侵蚀和水土流失使陇东地区支离破碎，部分地段甚至已将塬区瓦解。基于高分辨率遥感影像目视解译获取陇东地区残塬面积，再通过计算陇东地区的残塬面积占比，对该地区残塬分布规律及土壤侵蚀影响因素进行了分析。研究发现：研究区从南向北，残塬面积占比逐渐减小；从中部往两侧，残塬面积占比减小。从高程、黄土厚度、降雨量及植被4个方面分析引起这种残塬分布差异的原因，结果表明：① 高程越高，残塬面积占比越小；② 黄土厚度越大，残塬面积占比越大；③ 降雨不是残塬面积比的影响因素，植被覆盖度与残塬面积比具有正相关性；④ 黄土厚度与残塬面积比的正相关率为66.7%，即黄土厚度是影响残塬面积分布的主导因素。低厚度低塬占比区是固沟保塬工程今后研究的重点。

关键词: 残塬分布规律, 残塬面积占比, 影响因素, 目视解译, 陇东地区

Abstract: Gully erosion and soil-water loss have broken the landform in east Gansu Province, and some tableland areas have even collapsed. Based on the visual interpretation of high resolution remote sensing image, the residual tableland in east Gansu Province was obtained, and then the proportion of residual tableland area was calculated. The distribution law of residual tableland and the influencing factors of soil erosion in this area were analyzed. The general proportion law in the study area was as follow: the proportion of the residual tableland area decreases gradually from south to north, and from the middle to the two sides. The factors influencing the distribution of residual tableland in the study area are analyzed from 4 aspects of elevation, soil thick, rainfall and vegetation. The distribution characteristics of the residual tableland are as follows: (1) the higher the elevation is, the smaller the proportion of residual tableland area is; (2) the larger the loess thickness is, the larger the residual tableland area proportion is; (3) rainfall is not the influence factor, and the vegetation cover degree has a positive correlation to the residual area; (4) the positive correlation rate between loess thickness and area ratio of residual tableland is 66.7%, that is, loess thickness is the dominant factor affecting the area distribution of residual tableland. The area with small soil thickness and low residual tableland proportion is the key of future research on gully control and tableland protection.

Key words: regularities of tableland distribution, residual tableland area ratio, influencing factor, visual interpretation, east Gansu Province

袁爽，许强，赵宽耀，陈婉琳，徐建强，郭鹏. 陇东地区残塬分布规律及影响因素分析[J]. 人民长江, doi: 10.16232/j.cnki.1001-4179.2019.08.011.

YUAN Shuang, XU Qiang, ZHAO Kuanyao, CHEN Wanlin, XU Jianqiang, GUO Peng. Analysis on distribution law and influencing factors of residual tableland in east Gansu Province[J]. , doi: 10.16232/j.cnki.1001-4179.2019.08.011.

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陇东地区残塬分布规律及影响因素分析

Analysis on distribution law and influencing factors of residual tableland in east Gansu Province

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