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通过对1988年9月15日的TM遥感影像、2000年5月19日的ETM遥感影像和2006年7月7日的ETM遥感影像解译,获取了长武县的土地利用图,根据中国陆地生态系统单位面积生态服务价值,求算出长武县的生态系统服务价值。结果表明:30年来,长武县的耕地面积随着“退耕还林”工程的推进有显著下降,林地面积则随着三北防护林建设工程的实施显著增加,未利用土地、水域和草地面积变化不大;长武县总体生态系统服务价值总量在逐年递增,从1988年的5.67×108元上升到2006年的5.72×108元,生态系统总体向健康方向发展。
The land use map of Changwu County was obtained through interpretation of TM remote sensing image of September 15, 1988, ETM remote sensing image of May 19, 2000 and ETM remote sensing image of July 7, 2006. According to the data of China land Ecosystem unit area ecological service value, calculate the value of ecosystem services in Changwu County. The results showed that in 30 years, the area of arable land in Changwu County decreased significantly with the progress of the “Conversion of Farmland to Forestland” project, and the area of forestland increased significantly with the implementation of Sanbei shelterbelt construction project. The land, water area and grassland The total ecosystem service value in Changwu County increased year by year, from 5.67 × 108 yuan in 1988 to 5.72 × 108 yuan in 2006. The ecosystem was generally in a healthy direction.