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| A Preliminary Study on the Transpiration Rate Based on High Spectral Index Method for Tamarix ramosissima in the Southern Periphery of the Gurbantunggut Desert |
| Wang Shanshan1, Chen Xi1, Zhou Kefa1, Wang Zhong2 |
1. Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
2. Xinjiang Institute of Nuclear and Biotechnology, Xinjiang Academy of Agricultural Sciences, Urumqi 830091, China |
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Abstract Water availability is one of the most important factors limiting photosynthetic assimilation of carbon dioxide and growth of individual plants in terrestrial ecosystems. Transpiration rate (Tr) of plants has been widely assessed using ecological methods in field measurements; however, approaches for remote sensing Tr are still lacking, particularly in arid ecosystems. In this study, a comprehensive analysis of diurnal Tr via spectral indices in arid ecosystems was assessed. Analyses were conducted on a native dominant desert shrub, Tamarix ramosissima, in its original habitat on the southern periphery of the Gurbantunggut Desert, China. Based on diurnal measurements of spectral reflectance, photosynthesis, and micrometeorological variables, simple and useful spectral indices for estimating diurnal Tr at the assimilative organ scale were explored. From six types of spectral indices, ranging from simple to sophisticated, the best wavelength domains for a given type of index were determined by screening all combinations using correlation analysis. The coefficient of determination (R2), ranging from 0.06 to 0.73, for Tr was calculated for all indices derived from spectra taken from the assimilative organs. With only two wavelengths and a significant correlation coefficient (R2=0.73), the Simple Ratio (SR) type index was the most sensitive to Tr among all of the indices. Determine the best ranges of SR type index band are Near-infrared band (1 645-1 655 nm) and (1 775-1 785 nm), which are sensitive to changes water relations of vegetation. Furthermore, SR is a useful indicator to determine the dynamic and diurnal processes of transpiration of T. ramosissima. Therefore, SR makes a preliminary attempt of Tr for simple and fast access to large scale water consumption.
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Received: 19 March 2014
Published: 20 July 2014
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2014, Vol. 34 
