摘要:
基于多时相的Landsat8 OLI卫星遥感数据,采用面向对象的分类方法,提取双台河口国际重要湿地芦苇分布信息。通过对归一化植被指数( normalized difference vegetation index ,NDVI)等6个植被指数与野外实测芦苇地上生物量数据间的统计分析,比较不同植被指数对芦苇地上生物量的敏感性,构建双台河口国际重要湿地芦苇地上生物量遥感反演模型;应用该模型对芦苇地上生物量进行遥感反演以及空间格局分析。结果表明:双台河口国际重要湿地芦苇分布面积为4.39×104 hm2,约占该研究区总面积32.96%;选取的6个植被指数均与芦苇地上生物量显著相关(p<0.05),其中,以NDVI为变量的幂指数形式的估算模型为芦苇地上生物量遥感估算最优模型,模拟精度为79%,决策系数为0.76;双台河口国际重要湿地芦苇地上生物量呈东高西低和北高南低的分布格局,其平均地上生物量为4785.5 g/m2,总地上生物量为2.06×106 t;本研究结果可为双台河口国际重要湿地生态系统管理和生物多样性保护提供数据支持与科学指导。
Abstract:
With the object -oriented classification method , the spatial distribution of Phragmites australis was obtained based on multi -temporal Landsat8 OLI data covering Shuangtai Estuary National Nature Reserve .By analyzing the sensitivity between different vegetation indexes and aboveground biomass ( AGB ) of Phragmites australis, the retrieval model of AGB for Phragmites australis was developed .Furthermore, the spatial pattern of AGB for Phragmites australis was observed .The results showed that the area of Phragmites australis was 4.39 ×104 hm2 , accounting for 32.96%of the study area of the Shuangtai Estuary National Nature Reserve .Selecting NDVI as the variable for the power function , the authors formulated the optimal model for estimating AGB of Phragmites australis with an estimation accuracy of 79%.Average AGB of Phragmites australis was 4 785 .5 g/m2 and total AGB was 2.06 ×106 t.High values of AGB were observed in the northeast part , while low AGB values in the southwest .The results obtained in this study would provide data to support wetland ecosystem management and scientific guidance for Shuangtai Estuary National Nature Reserve .
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