关键词: 土地沙漠化, 敏感性评价, 空间格局分布, 奈曼旗

Abstract:

Taking Naiman Banner as the research object,this paper selected five factors as evaluation indexes: dryness index,windy sand days,soil silt content,vegetation coverage and slope. The study area was divided into five grades: extremely sensitive,highly sensitive,moderately sensitive,slightly sensitive and insensitive. The spatial distribution and influencing factors of land desertification sensitivity were studied and analyzed. The results showed that: 1) on the whole,in 2020,Naiman Banner had the largest land area with mild desertification sensitivity,accounting for 29.7% of the total area;Followed by high sensitive land,accounting for 22.9%;Moderately sensitive land,accounting for 22.2%;Insensitive grade,accounting for 15.2%;The land area of extremely sensitive grade accounted for the lowest,which was 10.0%. The land desertification sensitivity of Naiman Banner decreased from north to south in space. 2) In terms of natural conditions,the main reason for the spatial difference of desertification sensitivity was vegetation coverage,followed by windy sand days,dryness index,soil silt content and slope. 3) From the perspective of land use,human activities also had a certain impact on land desertification. The sensitivity of land desertification was positively correlated with the area of cultivated land and sandy land,and negatively correlated with the area of forest land.

Key words: land desertification, sensitivity evaluation, spatial pattern distribution, Naiman Banner