鄱阳湖几种常见湿地植物光谱特征的初步研究

Analysis on the Spectrum Characteristics of Typical Wetland Vegetation in Poyang Lake

以鄱阳湖南矶山自然保护区湿地为实验区,使用FieldSpec3便携式地物波谱仪对2010年11月的苔草、芦苇、南荻、虉草等7种鄱阳湖典型湿地植物的反射光谱数据进行采集和处理,并对不同湿地植物的光谱特征、光谱差异进行了分析;在此基础上运用二阶导数方法得到识别典型湿地植被的7个最佳波段:685.8 nm,692.4 nm,698.6 nm,704.3 nm,737.5 nm,746.2 nm,957.1 nm。通过验证,植被类型分类精度和样点验证精度分别为85.7%和91.5%。

The wetland of Nanji Nature Reserve of Poyang Lake was selected as the research area.The spectral of Carex cinerascens Kukenth,P.australis（cav.） Trin.ex Stend,T.Lutarioriparia L.Liu,and P.arundinacea L.etc.were measured by an ASD FieldSpec3 spectrometer（350~2 500 nm）.Then the features of these spectral curves from the wetland vegetation were analyzed.Meanwhile,second derivative analysis was applied to these transformed spectral in order to identify which spectral bands were the most biological explanative for the differentiation of wetland vegetation.This research identified 7 optimal spectral bands（685.8 nm,692.4 nm,698.6 nm,704.3 nm,737.5 nm,746.2 nm,957.1 nm） that appeared to contain the majority of the wetland information content of the full spectral resolution.It was validated that the vegetation type classification accuracy was 85.7% and the sample validation precision was 91.5%.