长江流域资源与环境 >> 2011, Vol. 20 >> Issue (3): 332-.

• 环境监测 • 上一篇    下一篇

三峡水库156米蓄水位消落区植被恢复遥感动态监测研究

李伟萍,曾源,吴炳方,张磊,赵炎,王强   

  1. (中国科学院遥感应用研究所|北京 100101)
  • 出版日期:2011-03-20

RESEARCH AND MONITORING OF VEGETATION RECOVERY BASED ON REMOTE SENSING IN THE DRAWDOWN AREA OF THE THREE GORGES BASIN 

LI Weiping, ZENG Yuan, WU Bingfang, ZHANG Lei, ZHAO Yan, WANG Qiang   

  1. (Institute of Remote Sensing Applications Chinese Academy of Sciences,Beijing 100101,China)
  • Online:2011-03-20

摘要:

基于2007~2009年的Landsat5TM、HJ1A/1BCCD遥感数据,利用像元二分法对三峡水库156 m蓄水位消落区的植被覆盖度进行了计算,分析了消落区植被恢复的时空变化特征,探讨了植被恢复时空变化的影响因子。2007、2008、2009年3 a 156 m蓄水位消落区植被覆盖度分别为512%、515%、492%,其中支流消落区的植被覆盖度高于干流,这与地形条件有关,坡度的大小决定了消落区植被覆盖的空间差异。2008年与2007年消落区植被覆盖状况基本一致,而2009年的植被覆盖度低于之前两年,这与三峡大坝水位调度方案不同有关,退水较晚时,植被生长时间较短,其植被覆盖度较低。研究结果表明,在正常的调度、一定的地形条件下,淹没数月的消落区植被具有一定的自然萌生能力。

Abstract:

Based on the Landsat5TM and disaster monitoring satellite CCD(HJ1A/1B)data during 2007~2009,the Vegetation Fractional Cover(Fc)in the drawdown area of the Three Gorges reservoir below 156 meter level was calculated by the dimidiate pixel model.This paper analyzed not only the spatial and temporal variation of the Fc in the drawdown area,but also the environmental impact factors.The Fc in 2007,2008,and 2009 was 512%、515%、492% respectively,and the Fc in stem stream area was higher than that in tributary.This was related with the geological conditions,and the slope determined the spatial difference of the Fc.The Fc of 2008 in the drawdown area was basically same with that in 2007,while the Fc in 2009 was lower than that in 2007 and 2008.This was related with the dynamic scheduling scheme of Three Gorge.When the water back later,the drawdown area exposed later,and the Fc was lower.The results show that the vegetation in the drawdown area of the Three Gorges basin has a certain ability to recover naturally.

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