摘要
选取风速、日照、气温年较差、相对湿度、坡度、坡向、植被盖度、土壤可蚀性K值、海拔和冰川积雪变化因子作为西藏那曲地区融水侵蚀强度评价的影响因子,运用主成分分析方法提取融水侵蚀的主要影响因素,并计算不同环境背景条件下的融水侵蚀强度因子,利用GIS技术对那曲地区融水侵蚀进行分级评价,分析那曲地区融水侵蚀分布特征。结果显示,融水侵蚀主要影响因素分别是地形地貌因素、气候因素、土壤因素和冰川积雪变化因素。那曲地区融水侵蚀分级结果表明,研究区融水侵蚀各强度等级所占面积由大到小依次为微度(40%)、极强度(24%)、中度(16%)、轻度(8%)、剧烈(7%)、强度(5%)。
Ten influencing factors were selected as indicators to evaluate the meltwater erosion intensity in Naqu district,as wind speed,total sunshine,annual range of temperature,relative humidity,slope gradient,aspect,NDVI,soil erodibility,elevation and snow change factor.The dominant influencing factors on meltwater erosion intensity were extracted by the method of principal components analysis,and the index of meltwater erosion intensity for each evaluation unit was calculated under different environmental backgrounds.Moreover,the meltwater erosion degrees were evaluated based on GIS software and the spatial distribution characteristics of meltwater erosion were analyzed in Naqu district.The results showed four dominant influencing factors on meltwater erosion,as geomorphology factor,climate factor,soil factor and snow change factor.Six degrees were classified for the meltwater erosion intensity in the study area.The percentage of areas with different meltwater erosion intensity degrees are：extremly slight erosion（40.0%）,extremly serious erosion（24.0%）,medium erosion（16.0%）,slight erosion（8.0%）,violent erosion（7.0%）,serious erosion（5.0%）.
出处
《陕西师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2015年第5期90-95,共6页
Journal of Shaanxi Normal University：Natural Science Edition
基金
国家自然科学基金重点项目(41230746)
国家自然科学基金(41271304)
关键词
融水侵蚀
主成分分析
GIS
那曲地区
强度评价
meltwater erosion
principal components analysis
GIS
Naqu district
strength evaluation
