【摘要】 以遥感和地理信息系统为技术支撑,提取草地动态变化数据,分析了1989—2001年吉林省西部地区草地动态变化。研究结果表明:12年间草地面积减少22 68万hm2,年减少率为1 75%,表现在低覆盖度草地面积大量减少,主要转变成耕地、盐碱地及草地类型间转换,并且有不同程度的退化。造成这一结果的原因是人口压力过大导致过度放牧、盲目开垦等。草地面积的减少及覆盖度的降低对区域经济发展产生了制约作用,应采取管理、生物和工程等综合措施以有效恢复和发展草地资源。更多还原

【Abstract】 Based on the technology of RS and GIS, the paper extracted the dynamic data of grassland and analyzed the dynamic change of Western Jilin from 1989 to 2001. The result showed that 22.68 myriahectare of grassland decreased during the 12 years and annual decreasing rate was 1.75 percent. A great deal of low-covered grassland decreased and was turned into farmland, alkaline soil and other types of grassland. The stress of population resulted in the over-grazing and over-reclamation. As a result, the development of regional economy was confined due to the decrease of grassland and the low covering. The comprehensive measures of management, biology and engineering should be taken to effectively recover and develop the grassland resources.更多还原