摘要
以MODIS NDVI数据和降水量站点数据为基础,计算内蒙古风蚀区2001—2018年的相对降水利用率(RUE_(r)),通过分析RUE_(r)的时间变化、空间分布及变异系数,综合评价内蒙古风蚀区18年间的沙漠化演变情况。结果表明,18年间内蒙古风蚀区内的RUE_(r)呈现出微弱的下降趋势,沙漠化程度加剧;空间分布上,62.98%的地区为正斜率,植被呈恢复状态,降水为影响沙漠化的主导因素;37.02%的地区为负斜率,植被出现退化现象,人类活动为影响沙漠化的主导因素。研究区内89.09%的地区为轻度沙漠化,重度沙漠化地区集中在内蒙古西北部,中度沙漠化和非沙漠化地区在研究区内零星分布。18年间内蒙古风蚀区的沙漠化变异程度较大,87.91%的地区表现为脆弱到非常脆弱,仅有12.09%的地区表现为稳定到非常稳定。
Based on MODIS NDVI data and precipitation station data,this paper calculated the relative rainfall utilization efficiency(RUE_(r))in the wind erosion area of Inner Mongolia from 2001 to 2018.By analyzing the temporal variation,spatial distribution and coefficient of variation of RUE_(r),the evolution of desertification in the wind erosion area of Inner Mongolia in the past 18 years was evaluated comprehensively.The results showed that during the past 18 years,the RUE_(r) in the wind erosion area of Inner Mongolia had shown a weak downward trend,which means the degree of desertification had increased.In terms of spatial distribution,62.98%of the study areas had a positive slope,vegetation was in a recovery state,precipitation was the leading factor affecting desertification,37.02%of the study areas had a negative slope,vegetation was in a degraded state,human activity was the leading factor affecting desertification.89.09%of the study areas were light desertification.The areas with heavy desertification were concentrated in the northwest of Inner Mongolia,while the areas with moderate and no desertification are scattered in the study areas.In the past 18 years,the degree of desertification variation in the wind erosion area of Inner Mongolia was relatively large,87.91%of the study areas were fragile to very fragile,and only 12.09%of the study areas were stable to very stable.
作者
泉涛
王静璞
党文硕
刘新秋
沈瑞华
QUAN Tao;WANG Jing-pu;DANG Wen-shuo(School of Resources and Environmental Engineering,Ludong University,Yantai,Shandong 264025)
出处
《安徽农业科学》
CAS
2021年第8期72-76,共5页
Journal of Anhui Agricultural Sciences
基金
国家自然科学基金项目(41701005)
国家级大学生创新创业训练计划项目(201810451006)。
关键词
沙漠化
相对降水利用率
时空变化
内蒙古风蚀区
Desertification
Relative rainfall utilization efficiency
Spatial-temporal variation
Wind erosion area of Inner Mongolia
