Seasonal contribution and interannual variation of evapotranspiration over a reed marsh (Phragmites australis) in Northeast China from 3-year eddy covariance data

摘要: At present, one of unresolved critical issues relating to climate change is whether evapotranspiration (ET) increasing or decreasing with global warming. There has been great interest, therefore, in studying ET a variety ecosystems better understand the nature controlling interactions and links between other ecosystem processes. Especially, relatively few studies on have conducted wetland environments. In this paper, we present results from 3 years (2005–2007) direct measurements, using eddy covariance method, over reed (Phragmites australis) marsh Liaohe Delta, Northeast China. The seasonal interannual variation daily its main controls were analysed. Annual for was 432, 480, 445 mm 2005, 2006 2007, respectively. contribution during non-growing season not negligible; it ranged 13% 16% annual investigated years. On course, increased associating temperature plant growth late-April early-May, peaked rapid growing weekly mean rates 3·7 day−1 (2005), (2006), 3·4 (2007). Decoupling factor (Ω) also varied seasonally, minimum values occurred maximum season, especially July. During decoupling generally 0·5 0·8, indicating that solar radiation affecting than vapour pressure deficit (VPD). Moreover, biological canopy conduction controlled marsh. would be helpful particular Copyright © 2009 John Wiley & Sons, Ltd.