大熊猫主食竹开花后叶片光谱特性的变化

以佛坪自然保护区为研究区域，选取不同开花状态的大熊猫主食竹种巴山木竹、秦岭箭竹和龙头竹进行高光谱遥感测定，用原始光谱分析法和红边参数法分析开花对大熊猫主食竹光谱特征的影响。结果表明：(1)开花改变了各种竹子叶片反射光谱，龙头竹三种状态之间的光谱差异最大，其次为秦岭箭竹;(2)开花后，巴山木竹红边位置未发生明显移动，而秦岭箭竹和龙头竹则发生“蓝移”。研究发现原始光谱特征和红边位置在不同开花状态下都发生了变化，可以为大熊猫主食竹开花的遥感预测提供一定的实验基础及理论依据。

The Changes in Spectral Features of the Staple-Food Bamboos of Giant Panda after Flowering

Large-area flowering of the giant pandas’ staple food is an important factor which can influence their survival. Therefore, it is necessary to predict the bamboo flowering. Foping Nature Reserve was taken as the study area. The research selected the giant pandas’ staple-food bamboos Bashania fargesii, Fargesia qinlingensis and Fargesia dracocephala with different flowering situations (i.e., flowering, potential flowering, non-flowering with far distance) to measure the spectral reflectance of bamboo leaves. We studied the influence of bamboo flowering on the spectral features of three bamboo species through analyzing the original spectral reflectance and their red edge parameters. The results showed that (1) the flowering changed the spectra features of bamboo species. The spectral reflectance of B. fargesii shows a pattern: flowering bambooF. qinlingensis and F. dracocephala show the different pattern: flowering bamboopotential flowering bamboo>non-flowering bamboo with far distance. Among three bamboo species, F. dracocephala showed the greatest change, and then F. qinlingensis. (2) After bamboo flowering, the red edge of B. fargesii has no obvious shifting, while the other two bamboos have distinctive shifting towards the shorter waves. The study found that the original spectral feature and the red edge all changed under various flowering states, which can be used to provide the experimental basis and theoretic support for the future prediction of bamboo flowering through remote sensing.