新疆地区药用红花的高光谱特征研究

Hyperspectral characteristics of Carthamus tinctorius in Xinjiang region

中药资源调查是中药资源保护和利用的首要问题,实时准确地监测药用植物种类和覆盖面积对药用植物物种多样性研究和生态环境的可持续发展具有重要意义。花期是遥感识别物种的关键时期,花期具有独特的光谱特征,相比营养生长期通过花更容易识别物种。红花作为新疆地区主要的经济和药用植物,已受到广泛关注。该文于2011年7月在新疆昌吉地区的红花栽培样地对红花冠层以及红花样地边缘的高光谱测定,得到红花冠层、采摘过后剩下的红花冠层、红花样地边缘及红花叶片光谱反应曲线。通过对其冠层光谱特征分析,发现红花冠层以及采摘过后剩下的红花冠层有特征吸收峰,且存在于770 nm附近;通过光谱分析发现红花冠层光谱与红花地边缘的光谱存在显著差异。一阶导数以及反高斯模型研究表明红花冠层能满足植被光谱基本特征的同时又与红花样地边缘植被冠层存在显著的差异。该文提出的方法旨在研究红花的高光谱特征,为监测红花的生长状态和生理参数提供前期的理论基础,为今后红花的分布面积估算及动态精细监测做铺垫。

Investigation of traditional Chinese medicine resources is the most important issue of the protection and use of tradi- tional Chinese medicine resources. Real-time monitoring of medicinal plant species and coverage of an area are of great significance to the sustainable development of the medicinal plant species diversity and ecological environment. Flower has unique spectral characteris- tics. Comparing the vegetative stage through the flowering stage it is easier to identify species. The flowering stage is a eritieal period for identifying species with remote sensing. Carthamus tinctorius as a traditional Chinese medicine resources in XinJiang region, attrac- ted widespread attention in recent years. In this paper, the hyperspectral data of canopy and other vegetation canopy was measured in 2011. The spectral curve was analyzed, the result indicated that C. tinctorius canopy and the canopy after picking showed absorption peak near 770 nm, the first derivative of red edge spectra and invert-Gaussian model were analyzed, the result indicated that there was significant difference between C. tinctorius canopy and other vegetation canopy. The proposed method is designed to provide initial the- oretical foundation for growth condition and physiological parameters of C. tinctorius, and make theoretical groundwork for the distribu- tion and elaborate monitoring of C. tinctorius in future.