摘要
在明确了沙漠化土地的程度分级及其指标、监测方法的基础上,对科尔沁地区近50a来的沙漠化土地进行了遥感动态监测和分析。结果表明:科尔沁地区20世纪50年代未至70年代中期,是沙漠化土地扩展速度最快的一个时期,总面积增加了9084km2。从70年代中期到80年代后期,沙漠化土地继续呈快速增长之势,增加了9624km2;进入90年代,沙漠化过程呈现出逆转的趋势,沙漠化土地总面积由1987年的61008km2,减少到2000年的50142km2,减少了10866km2。就近50a来沙漠化土地变化的整体而言,经历了发展—再发展—逆转的过程。到2000年,科尔沁地区的沙漠化态势依然是严峻的。但从整个发展过程来看,沙漠化已呈现逆转的趋势。整个区域的生态环境在改善,环境容量在提高,继续发展下去,有望进入良性循环以保障生态环境与社会经济的可持续发展。
The evolvement of sandy desertified land in Horqin region for the last 5 decades was dynamically monitored and analyzed based on the grading indexes of desertified lands and the effective monitoring method. In the 20th Century, the desertified land developed at the most fast speed from late 1950s to middle 1970s and the total area had increased by \{9 084\} km2; the development of desertified land lasted its fast\|developing trend from middle 1970s to late 1980s and the total area had increased by \{9 624\} km2; as entering 1990s the processes of desertification became inversed, the total area had decreased from \{61 008\} km2 in year 1987 to \{50 142\} km2 in year 2000 and had decreased by \{10 866\} km2 during the 13 years. In the past 50 years the desertified land has generally experienced the processes of developing\?further developing\?inversing. Although the status of desertified land development was still arduous by year 2000, the revising trend is hopeful. If the trend of eco\|environment being improved and the environmental caring capacity being heightened is going on the eco\|environment and the social economy are possibly entering the sustainable development.
出处
《中国沙漠》
CSCD
北大核心
2003年第6期646-651,共6页
Journal of Desert Research
基金
国家"973"沙漠化项目(TG2000048705)
国家博士后研究基金资助
关键词
科尔沁地区
土地沙漠化
动态监测
荒漠化
last 5 decades
Horqin region
desertified land
dynamic monitor
