关键词: 大青沟, 自然保护区, 地理信息系统, 土地利用与覆盖

Abstract: Based on the digitized results of the three Desertification Maps of Daqingou Nature Reserve in Horqin Sandy Land and the data of related social and economic activities of this area, a Geographical Information System data set of the Nature Reserve has been set up for the convenience of further analysis in the future. Analysis of the above data showed that under protection, the natural forest cover in the Nature Reserve had been greatly restored with an area increase of 446 hm² in 1958 to 6 094 hm² in 1981, and the artificial wood land cover increased also. However, immediately outside the Nature Reserve, desertification had developed severely due to misuse of the land resource. Shifting dune cover and patch numbers increased from 916 hm² and 70 of 1958 to 9 221 hm² and 300 of 1981, respectively, while those of semi shifting, semi fixed and fixed dunes decreased. In addition to the above land use/cover changes of the rest were much less. Moreover, it is noticeable that the number of water bodies had been decreased from 50 of 1958 to about 25 of 1981, leading to an area decrease of 71 hm².

Key words: Daqingou, Nature Reserve, Geographical Information System, Land use/cover