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Author (up) Wagner, F.; Herault, B.; Stahl, C.; Bonal, D.; Rossi, V. openurl 
  Title Modeling water availability for trees in tropical forests Type Journal Article
  Year 2011 Publication Agricultural and Forest Meteorology Abbreviated Journal Agric. For. Meteorol.  
  Volume 151 Issue 9 Pages 1202-1213  
  Keywords Water balance model; Amazonian rainforest; Time domain reflectometer; Bayesian inference; Tree drought stress  
  Abstract Modeling soil water availability for tropical trees is a prerequisite to predicting the future impact of climate change on tropical forests. In this paper we develop a discrete-time deterministic water balance model adapted to tropical rainforest climates, and we validate it on a large dataset that includes micrometeorological and soil parameters along a topographic gradient in a lowland forest of French Guiana. The model computes daily water fluxes (rainfall interception, drainage, tree transpiration and soil plus understorey evapotranspiration) and soil water content using three input variables: daily precipitation, potential evapotranspiration and solar radiation. A novel statistical approach is employed that uses Time Domain Reflectometer (TDR) soil moisture data to estimate water content at permanent wilting point and at field capacity, and root distribution. Inaccuracy of the TDR probes and other sources of uncertainty are taken into account by model calibration through a Bayesian framework. Model daily output includes relative extractable water, REW, i.e. the daily available water standardized by potential available water. The model succeeds in capturing temporal variations in REW regardless of topographic context. The low Root Mean Square Error of Predictions suggests that the model captures the most important drivers of soil water dynamics, i.e. water refilling and root water extraction. Our model thus provides a useful tool to explore the response of tropical forests to climate scenarios of changing rainfall regime and intensity. (C) 2011 Elsevier B.V. All rights reserved.  
  Address [Wagner, F; Herault, B] Univ Antilles Guyane, UMR Ecol Forets Guyane, F-97387 Kourou, France, Email:  
  Corporate Author Thesis  
  Publisher Elsevier Science Bv Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0168-1923 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000294032000005 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 337  
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