生态脆弱区土地利用变化与沙漠化响应研究——以宁夏中部干旱带为例

以宁夏中部干旱带1978年MSS及1987、1996和2007年Landsat TM/ETM遥感影像为信息源,在3S技术支持下,对不同时期土地利用与沙漠化与沙漠化变化响应关系进行了分析。结果表明：耕地和草地是该地区的主要土地利用类型,分别占总面积的27.7%,24.7%。近30a来,耕地、城镇用地面积增幅较大,分别增加...

Land use change and its desertification response in vulnerable ecological area:A case in arid area of central Ningxia

By using data derived from the 1978 MSS image and 1987,1996,2007 Landsat TM/ETM images and with the help of 3S,the land use change and its desertification response in arid area of central Ningxia were analyzed.The results showed that the study area was primarily comprised of cultivated and grassland,specifically,cultivated and sandy land occupied 27.7% and 24.7% of the total study area.Furthermore,in the past nearly 30 years,cultivated land and urban land increased 229138.23hm2 and 232777.41hm2,respectively.Conversely,the grassland area was decreased from 1978 to 1987,thereafter,the area increased continuously.As the sane time,sandy land reduced by rate of 1.3% per year,and its area decreased 281682.04 hm2 between 1978 and 2007.This indicated that the constant aggravation of the desertification trend in the study area has been basically controlled,and the desertification degree had mitigated evidently.Based on the relationship of sandy desertification and land use,the most important reasons of desertification developed or reversed were that the various land use types conversed between by human conscious change land use types.