胡杨与灰叶胡杨的叶片光谱特征对比分析

Comparative analysis of leaf spectral characteristics of Populus euphratica and Populus pruinosa

本研究以塔里木河流域的胡杨与灰叶胡杨为研究对象,通过对叶片进行光谱测试,并结合室内化验分析数据,揭示胡杨及灰叶胡杨叶片的光谱特征,并研究二者之间的相关性。结果表明,胡杨与灰叶胡杨的叶片光谱反射率走向相似,但差异较明显;通过二者之间的两条反射光谱曲线的光谱相似性相关数值的计算,证明胡杨与灰叶胡杨的光谱相似性不高;胡杨与灰叶胡杨的包络线去除光谱的两个吸收谷位置走向一致,但差异显著性检验证明,二者的吸收斜率差异极显著。通过胡杨与灰叶胡杨的光谱位置特征进行对比筛选,判断不同胡杨品种的吸收特征参数,并通过筛选敏感波段反映光谱与色素的相关性,体现色素吸收光谱变化的强弱程度,更能体现色素含量变化的差异。为利用遥感技术监测胡杨与灰叶胡杨的健康状况提供技术支撑,进而为干旱区荒漠生态系统的恢复及植被重建提供理论基础。

The Populus euphratica and Populus pruinosa in Tarim River Basin were selected as the research object,through field spectral tests and laboratory analysis data,the spectral characteristics of the leaves of Populus euphratica and Populus pruinosa were revealed,and the correlation between them was also investigated.The results showed that the spectral reflectance trend of Populus euphratica and Populus pruinosa were similar,but the difference was obvious.The spectral similarity of Populus euphratica and Populus pruinosa was not high by calculating the spectral similarity correlation values of two reflection spectral curves of Populus euphratica and Populus pruinosa.The two absorption valleys of the envelope removal spectra of Populus euphratica and Populus pruinosa showed the same trend,but the difference significance test proved that the difference in absorption slope was very significant.By comparing the spectral position characteristics of Populus euphratica and Populus pruinosa,the absorption characteristic parameters of different Populus euphratica varieties were selected and judged,and the correlation between spectrum and pigment was reflected by screening the sensitive bands,reflecting the intensity of the change of pigment absorption spectrum and the difference of pigment content.In conclusion,this study provided technical support for monitoring the health status of Populus euphratica and Populus pruinosa by remote sensing technology,and further provided theoretical basis for the restoration of arid desert ecosystem and vegetation reconstruction.