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  

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

作　　者：贾科利[1] 张俊华[2] 马正亮[1] 叶蔚[1] 

机构地区：[1]宁夏大学资源环境学院,银川750021 [2]宁夏大学新技术应用研究开发中心,银川750021

出　　处：《干旱区资源与环境》2011年第10期98-103,共6页Journal of Arid Land Resources and Environment

基　　金：国家自然科学基金项目(40801219);宁夏大学211工程重点学科建设项目"草业科学与生态工程"子项目资助

摘　　要：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,分别增加了229138.23hm2和232777.41hm2;草地面积呈先减少后增加的趋势,沙漠化土地面积平均以每年1.3%的速率减少,面积减少了281682.04hm2,沙漠化程度逐渐减轻。人类有意识的改变土地利用方式,使土地利用类型之间相互转化,是影响沙漠化发展或逆转的直接原因。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.

关 键 词：土地利用 沙漠化 生态脆弱区 宁夏中部干旱带 

分 类 号：F301.24[经济管理—产业经济]