甘肃省天然草地退牧还草工程效益遥感监测研究——以安西县荒漠草地为例

Benefit monitor of retrieving grassland from grazing by remote sensing in natural grassland of Gansu province——Taking the desert grassland of Anxi county as an example

以"3S"技术为支撑,结合遥感图像、草地光谱观测以及地面调查数据对安西县实施退牧还草后植被恢复情况进行分析研究。结果表明:除河东戈壁温性荒漠草地短期效果不明显外,其它草地不论是盖度、高度和产草量还是植被指数,围栏内较围栏外均有一定幅度的提高,其中牧草盖度、高度和产草量围栏内较围栏外平均增加了5.0%、16.9%和6.8%,植被指数增加了8.9%,2005年植被指数较2004年增加了9.7%。高光谱遥感进一步监测结果显示围栏内牧草光谱反射率比围栏外高,同样说明牧草长势及生产力围栏内要好于围栏外。由此可见,安西县退牧还草工程的实施已经取得了明显的效果。

Remote sensing images, spectrum and field data were used to determine the effect of antigrazing on restoration of grassland vegetation in Anxi County using the ＂3S＂ technology in this study. The results of this study showed that fence increased vegetation cover, plant height, forage yield and vegetation index by 5.0%, 16.9%, 6.8% and 8.9%, respectively except for Gobi temperate desertification grassland distributing in the Hedong regions. Vegetation index of grassland in 2005 was higher than that of grassland in 2004, with the increase of 9.7%. The high spectrum remote sensing further confirmed that spectrum reflectance in fenced area was higher than that in unfenced area, indicating that productivity in fenced area were better than that of unfenced area. These suggested that antigrazing in Anxi County was beneficial to grassland restoration.