高光谱指数法用于确定多枝柽柳（Tamarix ramosissima）蒸腾速率

doi:10.7522/j.issn.1000-694X.2013.00403

摘要/Abstract

摘要： 蒸腾速率（Tr）是植物生理生态学研究中表征蒸腾耗水的常用指标，研究植物的蒸腾耗水有助于了解当地生态系统稳定性和水资源的可持续利用，但在遥感应用尤其在干旱区遥感应用中很少被使用。本文以古尔班通古特沙漠南缘的主要建群种多枝柽柳（Tamarix ramosissima）作为研究对象，应用高光谱指数法对其Tr日变化过程进行研究，寻找和确定最佳的Tr光谱指数。选择的6个光谱指数判定系数R²介于0.06～0.73，其中简单比值（SR）光谱指数有最高的判定系数（R²=0.73）、较低的均方根误差（RMSE=0.24）和较为简单的形式，光谱范围处于近红外波段（1 645～1 655 nm）/（1 775～1 785 nm）。SR作为Tr最佳光谱指数，对植被水分关系变化敏感，能够较好地记录和监测Tr日变化过程，有益于揭示光谱指数物理和生理机制。

关键词: 蒸腾速率, 日变化过程, 光谱指数, 多枝柽柳（Tamarix ramosissima）

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.

Key words: transpiration rate, diurnal course, spectral indices, Tamarix ramosissima

中图分类号:

Q945.79

王珊珊, 陈曦, 周可法, 王重. 高光谱指数法用于确定多枝柽柳（Tamarix ramosissima）蒸腾速率[J]. 中国沙漠, 2014, 34(4): 1023-1030.

Wang Shanshan, Chen Xi, Zhou Kefa, Wang Zhong. A Preliminary Study on the Transpiration Rate Based on High Spectral Index Method for Tamarix ramosissima in the Southern Periphery of the Gurbantunggut Desert[J]. JOURNAL OF DESERT RESEARCH, 2014, 34(4): 1023-1030.

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