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首页> 外文期刊>Estuarine Coastal and Shelf Science >Multi-seasonal spectral characteristics analysis of coastal salt marsh vegetation in Shanghai, China
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Multi-seasonal spectral characteristics analysis of coastal salt marsh vegetation in Shanghai, China

机译：上海沿海盐沼植被多季节光谱特征分析

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摘要

Remote sensing technology has become the primary tool for ecological research on a large scale. The spectral characteristics of the salt marsh vegetation canopy, including four main communities, Phragmites australis community, Spartina alterniflora community, Scirpus mariqueter community and Carex scabrifolia community, were measured in the seasons of spring, summer and autumn by a ground FieldSpec™ Pro JR spectroradiometer, at the Chongming Dongtan Nature Reserve in Shanghai. The spectral data were converted to the reflectance curves, and their first derivative curves between 350 nm and 1000 nm were calculated. The differences in the reflectance and first derivative curves were then analyzed, with particular attention paid to the characteristics in the bands of visible, "green peak", "red edge" and near infrared. The results from this study showed that the different salt marsh communities had different and rather unique spectral characteristics during the three seasons studied. The near-ground spectral reflectance varied with the growing season, community type and its phenology. The discrimination ability, in terms of variations in the spectral reflectance, among the four major salt marsh communities was highest in autumn. It is proposed that a realistic strategy for classifying the salt marsh vegetation could be adopted by integrating and analyzing their remotely sensed images of multi-seasons. The implications of the results from this study in terms of serving as a tool for monitoring and mapping the distribution pattern and dynamics of salt marsh vegetation on the eastern coast of China are discussed.
机译：遥感技术已成为大规模生态研究的主要工具。使用地面FieldSpec™Pro JR分光辐射计在春季，夏季和秋季分别测量了盐沼植被冠层的光谱特征，包括四个主要群落：芦苇群落，互花米草群落，Scripus mariqueter群落和Carex裂藻群落。位于上海崇明东滩自然保护区。将光谱数据转换为反射率曲线，并计算它们在350 nm和1000 nm之间的一阶导数曲线。然后分析反射率和一阶导数曲线的差异，尤其要注意可见，“绿色峰值”，“红色边缘”和近红外波段的特征。这项研究的结果表明，在所研究的三个季节中，不同的盐沼群落具有不同且相当独特的光谱特征。近地光谱反射率随生长期，群落类型及其物候变化。就光谱反射率的变化而言，四个主要盐沼群落之间的区分能力在秋季最高。提出可以通过整合和分析它们的多季节遥感影像，采取一种可行的盐沼植被分类策略。讨论了本研究结果作为监测和绘制中国东部沿海盐沼植被分布格局和动态的工具的意义。

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