石羊河流域下游民勤荒漠植物光谱特征分析

选取石羊河流域下游民勤10种典型荒漠植物进行地面反射光谱测定,通过分析荒漠植物光谱特征、红边参数及对比荒漠植物与农作物光谱数据,提取荒漠植物识别的波段和所需波段光谱分辨率。结果表明:1)10种荒漠植物具有相似的光谱曲线形状,但是不同荒漠植物种由于叶子的组织结构、色素含量和含水量不同,使得反射率大小又具有各自的特点;5个波段区间光谱曲线差异显著,用于识别荒漠植物。2)荒漠植物红边位置都靠近长波方向;沙蒿的红边幅值最大,锦鸡儿最小;沙拐枣的红边面积最大,泡泡刺最小。3)荒漠植物光谱反射特征在680nm、970nm、1450nm和2190nm附近与农作物有较大差异,光谱分辨率在可见光和近红外波段需要30nm或更窄,在中红外波段需要50nm或更窄。

Analysis on spectral reflectance characteristics of desert plants in Minqin Basin of Shiyang River

Taking Minqin Basin,downstream of Shiyang River as experimental area,ground spectral reflectance of 10 typical species desert plant were determined.The research analyzed the spectral reflectance common characteristics and red edge parameter characteristics of desert plants.At the same time,spectral curve with the area of crops were compared.Desert plants of identification band and the required identification of the band-band spectral resolution were extracted.The results showed that 10 kinds of desert plants have similar spectral curve shape,but different types of desert plants have their own characteristics because of the differences in leaf organizational structure,pigment content and moisture content.Band spectra of the five significant differences could be used to distinguish between different desert plants.Desert plants are close to the long-wave red edge position direction,Artemisia has the maximum amplitude of the red edge,Caragana has the minimum,Calligonum has the largest red edge.The major differences of reflectance of desert plant and crops were observed near 680nm,970nm,1450nm and 2190nm.The spectral resolution should be 30nm or less in visible and near infrared regions,and 50nm or less in middle infrared regions.