基于层次分析法的锡林郭勒草地景观系统风蚀危险性分析

发布时间：2018-03-17 05:23

  本文选题：风蚀　切入点：危险性分析　出处：《干旱区地理》2016年05期 　论文类型：期刊论文

【摘要】：基于景观尺度在锡林郭勒草地以400 m为间隔均匀布设160个采样点,对各采样点的坡位、坡度、坡向、坡形、土壤含水量、土壤容重、砂粒含量、植被高度、植被盖度、结皮盖度、结皮厚度、苔藓盖度进行野外实地调查及实验室分析测算。运用层次分析法计算各因子对风蚀的影响性权重,并结合实测值得出各采样点的风蚀危险性及空间分布。结果显示:研究区风蚀危险性具有明显的空间差异,轻险型(0风险值≤0.45)、危险型(0.45风险值≤0.5)和强险型0.5风险值≤1)区域的面积占研究区总面积的比例分别为68.7%、20.3%和11.0%。西部区域风蚀危险性较高,中部区域较低,东部区域危险性介于西部与中部之间,但南北差异较大。影响风蚀危险性的主要因素是人类活动,为降低土壤风蚀危险性,应减小人类活动对环境的影响,对牧地建议降低放牧强度,对耕地建议采取保护性耕作措施。
[Abstract]:On the basis of landscape scale, 160 sampling sites were evenly distributed at 400 m intervals in Xilinguole grassland. The slope position, slope, slope direction, slope shape, soil water content, soil bulk density, sand content, vegetation height, vegetation coverage of each sampling site were studied. Field investigation, laboratory analysis and calculation of crust cover, crust thickness and moss cover were carried out. The influence weight of each factor on wind erosion was calculated by AHP. Combined with the measured values, the wind erosion risk and spatial distribution of each sampling point are obtained. The results show that the wind erosion risk in the study area is obviously different in space. The risk value of light risk type 0 鈮，

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