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湿地植被生物量是湿地生态系统健康状况的重要指标,直接反映植被群落的生长状况和生产力高低。估测高寒沼泽湿地植被生物量有助于理解高寒沼泽生态系统与全球气候变化之间的反馈关系。以三江源隆宝滩自然保护区为研究对象,使用欧空局CHRIS/PROBA数据,利用高光谱光谱维信息和多角度立体结构信息,分析不同角度光谱反射率、窄波段植被指数、红边指数以及主成分分量与湿地植被地上干、鲜生物量的相关性,探讨生物量对角度的敏感性。结果表明:高寒沼泽湿地植被地上生物量对角度具有一定的敏感性,前向观测的+36°影像优于0°和-36°影像;-36°红边位点指数REIP对地上干生物量、鲜生物量的拟合效果最好,干生物量的R~2为0.599,F值为37.404;鲜生物量的R~2高达0.685,F值达54.410。研究区内最大地上生物量干重为446.7g/m~2,湿重为2 368.1g/m~2。
Wetland vegetation biomass is an important indicator of the health status of wetland ecosystems and directly reflects the growth status and productivity of vegetation communities. Estimating vegetation biomass in alpine marsh wetlands can help to understand the feedback relationship between alpine swamp ecosystems and global climate change. Taking Longbao Nature Reserve of Sanjiangyuan as the research object, using ESA CHRIS / PROBA data and hyperspectral spectral information and multi-angle stereo structure information, the spectral reflectance at different angles, vegetation index in narrow band, red edge index As well as the correlation between the main component and dry and fresh biomass of wetland vegetation, and discussing the sensitivity of biomass to the angle. The results showed that the aboveground biomass of the alpine swamp wetland was sensitive to the angle. The + 36 ° image of the forward observation was better than the 0 ° and -36 ° images. The -36 ° red edge locus index REIP had significant effects on aboveground biomass , The fitting effect of fresh biomass was the best, R ~ 2 of dry biomass was 0.599, F value was 37.404; R ~ 2 of fresh biomass was 0.685, F value was 54.410. The maximum dry weight of aboveground biomass in the study area was 446.7 g / m ~ 2 and wet weight was 2 368.1 g / m ~ 2.