Response Characteristics of the Field-Measured Spectrum for the Four Gerneral Types of Halophyte and Species Recognition in the Northern Slope Area of Tianshan Mountain in Xinjiang
1. College of Resources & Environment Science, Xinjiang University, Urumqi 830046，China 2. College of Art & Science, Beijing Union University, Beijing 100083，China 3. Key Laboratory of Oasis Ecology (Xinjiang University) Ministry of Education, Urumqi 830046，China
Abstract：Based on the field-measured Vis-NIR reflectance of four common types of halophyte (Achnatherum splendens(Trin.)Nevski, Sophora alopecuroides L., Camphorosma monspeliaca L.subsp.lessingii(L.)Aellen, Alhagi sparsifolia shap) within given spots in the Northern Slope Area of Tianshan Mountain in Xinjiang, the spectral response characteristics and species recognition of these types of halophyte were analyzed. The results showed that (Alhagi sparsifolia shap) had higher chlorophyll and carotenoid by CARI and SIPI index. (Sophora alopecuroides L. was at a vigorously growing state and had a higher NDVI compared with the other three types of halophyte because of its greater canopy density. But its CARI and SIPI values were lower due to the influence of its flowers. (Sophora alopecuroides L.) and (Camphorosma monspeliaca L.subsp.lessingii(L.)) had stable REPs and BEPs, but REPs and BEPs of (Achnatherum splendens(Trin.)Nevski, Aellen, Alhagi sparsifolia shap) whose spectra red shift and spectra blue shift occurred concurrently obviously changed . There was little difference in spectral curves among the four types of halophyte, so the spectrum mixing phenomenon was severe. (Camphorosma monspeliaca L.subsp.lessingii(L.)Aellen) and (Alhagi sparsifolia shap) could not be separated exactly in a usual R/NIR feature space in remote sensing. Using the stepwise discriminant analysis, five indices were selected to establish the discriminant model, and the model accuracy was discussed using the validated sample group. The total accuracy of the discriminant model was above 92% and (Achnatherum splendens(Trin.)Nevski) and (Camphorosma monspeliaca L.subsp.lessingii(L.)Aellen) could be respectively recognized 100% correctly.
张 芳1, 3, 熊黑钢2, 3*, 努尔巴依·阿布都沙力克1, 3, 栾福明1, 3 . 新疆天山北坡常见盐生植物端元尺度光谱特征及识别[J]. 光谱学与光谱分析, 2011, 31(12): 3336-3341.
ZHANG Fang1, 3，XIONG Hei-gang2, 3*，Nurbay Abdusalih1, 3，LUAN Fu-ming1, 3. Response Characteristics of the Field-Measured Spectrum for the Four Gerneral Types of Halophyte and Species Recognition in the Northern Slope Area of Tianshan Mountain in Xinjiang . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2011, 31(12): 3336-3341.
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