点击次数：

论文类型：期刊论文

发表时间：2011-07-01

发表刊物：AQUATIC BOTANY

收录刊物：Scopus、SCIE

卷号：95

期号：1

页面范围：45-50

ISSN号：0304-3770

关键字：Evapotranspiration; Wetlands; Measurement; Phragmites australis

摘要：This paper introduces a multi-cylinder evapotranspirometer method, which can directly measure evapotranspiration (ET) from emergent plants in different species and states as well as simultaneously measure evaporation (E(w)) from an open water surface. Values of daily ET from three contrasting reed (Phragmites australis) stands, with different leaf area indexes (LAI), were obtained through in situ measurements of the Baiyangdian wetland using this method during the growing seasons in 2008 and 2009. The results showed that the ET rate of the reed belt was very high, even exceeding 20 mm d(-1) under extreme weather conditions. Depending on the LAI change, the annual ET from the different reed canopies ranged from 970 to 2035 mm, whereas the ET/E(w) ratios ranged from 2.05 to 3.98. Accuracy analysis results showed that the errors of the measurement from this method were no more than 2 mm. The relative errors of the measurement were correspondingly from 0.04% to 0.33%. It is indicated that the accuracy of our measurement is good enough for the requirements of the ET measurement. (C) 2011 Elsevier B.V. All rights reserved.