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利用FieldSpec4便携式地物光谱仪和ASD积分球,于2014年7月和12月对研究区6种典型植被进行光谱数据采集与处理,分析植被冠层和落叶的光谱特征及其变化规律,同时分析坡度因素、测量方法对植被光谱反射率的影响。结果表明:不同季节常绿植被光谱存在差异,不同植被光谱反射率的季节变化也不同。冬季常绿植被具有相似的光谱特征,但是不同植被类型之间也存在明显的差异。冬季植被冠层光谱呈现出先降低后稳定的特点;植被落叶层光谱由于受叶片色素、含水量、土壤背景等因素的影响,在衰老腐化的过程中并未出现明显的规律性变化。一定坡度范围内,植被光谱反射率随坡度的增大而升高。不同的测量方法获取的植被光谱反射率不同,但是光谱变化规律相同。
Spectral data of six typical vegetations in the study area were collected and processed in July and December 2014 by using the FieldSpec4 portable matter spectrometer and ASD integrating sphere. Spectral characteristics and variation of vegetation canopy and deciduous were analyzed. Meanwhile, the slope Influence of Factors and Measurement Methods on Spectral Reflectance of Vegetation. The results show that there are differences in the spectra of evergreen vegetation in different seasons, and seasonal changes of spectral reflectance in different vegetation are also different. Winter evergreen vegetation has similar spectral characteristics, but there are also significant differences between different vegetation types. The canopy spectra of winter vegetation showed the characteristics of first decreasing and then stabilizing. Because of the influence of leaf pigment, water content, soil background and other factors, the spectrum of vegetation deciduous layer did not change obviously in the process of senescence. Within a certain slope, the spectral reflectance of vegetation increased with the increase of slope. Vegetation spectral reflectance obtained by different measurement methods is different, but the spectrum changes the same.