为了解及评估左江流域土壤侵蚀的现状及其空间分布规律,本文采用中国土壤流失方程(Chinese Soil Loss Equation简称CSLE)对研究区定量评价土壤侵蚀状况.在地理信息系统(GIS)技术支持下,对研究区的土壤侵蚀状况进行空间分布规律分析,结果表明:左江流域的土壤侵蚀面积为4259.47 km2,占土地总面积的19.55%,总体以轻度和中度为主,主要分布在左江及其支流两岸的丘陵台地;各地类土壤侵蚀面积依次为旱地(11.84%)＜有林地(2.93%)＜灌木林地(2.54%)＜人为扰动土地(0.71%)＜其他草地(0.60%)＜其他林地(0.38%),旱地和人为扰动是水土流失防治的重点.坡度对土壤侵蚀侵蚀的影响明显,各坡度土壤侵蚀依次为缓坡(29.35%)＜较陡坡(21.76%)＜较缓坡(17.37%)＜微坡(14.98%)＜陡坡(10.82%)＜急陡坡(5.73%).坡向对土壤侵蚀分布不显著,各坡向的分布较为均衡.该研究成果可为水土流失治理和生态保护提供决策依据.
Quantitative evaluation and analysis of soil erosion for Zuojiang River basin based on GIS and CSLE
In order to understand and evaluate the current status and spatial distribution of soil erosion in Zuojiang River basin,CSLE was adopted to conduct quantitative evaluation of soil erosion in the study area,and the spatial distribution of soil erosion in the study area was analyzed under the technical support of GIS.The results demon-strate that the soil erosion area in Zuojiang River basin is 4259.47km2,taking up 19.55%of total land area;the ero-sion is mostly mild and moderate and mainly distributes in the hilly terraces on both sides of the Zuojiang River and its tributaries;the percentages of erosion areas of various kinds of lands are in turn dry land of 11.84%,forest land of 2.93%,shrub land of 2.54%,artificially disturbed land of 0.71%,other grassland of 0.60%and other forest land of 0.38%.Dry lands and human disturbance are the focus of soil erosion control.Slope has obvious effect on soil ero-sion.The percentages of erosion areas of various slopes are in turn gentle slope of 29.35%,steeper slope of 21.76%,gentler slope of 17.37%,slight slope of 14.98%,steep slope of 10.82%and abrupt slope of 5.73%.Slope orientation has no significant effect on soil erosion distribution.The soil erosion distribution of various slope orientations are rel-atively balanced.The study results can provide basis for soil erosion control and ecological protection.
soil erosionChinese Soil Loss Equation(CSLE)spatial distributionZuojiang River basin
万方数据
维普
