Spatiotemporal variation patterns of land desertification from 2000 to 2020 in the Horqin-Otindag Sandy Land
The Horqin-Otindag Sandy Land is one of the areas with the most severe land desertification in Chi-na.Understanding spatiotemporal patterns of land desertification is an important foundation for scientific deserti-fication control.The study took the Horqin-Otindag Sandy Land as the study area.Based on the MOD13Q1 ND-VI data,meteorological data,socio-economic data,the spatiotemporal patterns of land desertification and their driving factors were revealed from 2000 to 2020 using Sen+Mann Kendall trend analysis,strip analysis,geo-graphical detectors and other methods.The results showed that:(1)The land desertification intensity was much more serious in the west than that in the east.Slight desertification appeared in the junction of the Horqin Sandy Land and the Otindag Sandy Land.(2)From 2000 to 2020,land desertification in the study area showed a signif-icant reversal trend in general.The desertification reversed area accounted for 73.59％of the total study area,which mainly distributed in the middle east of Otindag Sandy Land and the southeast of Horqin Sandy Land.The desertification area with deterioration trend accounted for 11.17％,which was scattered in the study area.(3)The annual precipitation and population density are the dominant factors affecting the spatial pattern of land desertification during the study period.The interaction of all factors shows bivariate enhancement,among which the precipitation and soil type interaction most obvious.We suggested to strengthen cross regional cooperation and coordination under the premise of scientific assessment of regional resource and environment carrying capaci-ty,strengthen the governance of Otindag Sandy Land,optimize the industrial structure of Horqin Sandy Land,promote the coordinated development of ecology and economy,and promote the integrated protection and sys-tematic governance of mountains,rivers,forests,fields,lakes,grass and sand.This study could provide a theo-retical basis for the ecological restoration and sustainable utilization of desertified land in the study area.
land desertificationsandy landstrend analysisgeographic detector model
NETL
NSTL
万方数据
