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水浇地与旱地春小麦冠层高光谱反射特征比较

DOI: 10.6046/gtzyyg.2014.03.04, PP. 24-30

Keywords: 水浇地,旱地,春小麦,冠层光谱反射特征

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Abstract:

用野外实测的水浇地与不同坡向旱地春小麦各发育期的冠层光谱数据,对比分析各发育期春小麦冠层光谱反射特征;依据TM图像的波段设置将实测光谱划分为4个波段,对比分析水浇地与旱地春小麦光谱在各波段的差异,并选择出识别水浇地与旱地春小麦的最佳波段。研究结果表明:不同地类水浇地与旱地春小麦冠层光谱反射率在可见光波段呈现的总特点是阳坡地>双面坡地>阴坡地>水浇地,在近红外波段则相反;不同发育期的水浇地与旱地春小麦在可见光波段均呈现起身期>乳熟期>拔节期>抽穗期>扬花期的特点,在近红外波段则呈现扬花期>抽穗期>拔节期>起身期>乳熟期的特点;因各地类春小麦叶绿素含量的相对值和覆盖度不同,在可见光波段的光谱曲线也存在差异——水浇地与旱地春小麦在起身期和乳熟期的光谱曲线各成1条线,而在其他3个发育期则形成2条曲线(水浇地和阴坡地的光谱曲线基本重合,阳坡地和双面坡地的光谱曲线完全重合)。760~900nm谱段是识别水浇地与旱地春小麦的最佳波段。

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