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1. Two Modeling Methods for Estimating Tree Canopy Transpiration with Sap Flow Technique | |||
HAN Lei,HE Kangning,HU Xingbo,ZHANG Dong,QIN Jing | |||
Forestry 27 December 2010 | |||
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Abstract:Meteorological measurements combined with sap flow techniques provided a low-cost option to study the rates of water uptake by individual trees response to environmental factors on a continuous basis. Modeled canopy conductance (gc) has often been used to predict transpiration (Ec) with the Penman-Monteith (P-M) model. However, a Jarvis-type model, modified to direct estimate the Ec specifically rather than canopy conductance suggested an alternative method. For comparative purpose we parameterized both P-M and modified Jarvis type model using a series of environmental control functions: vapor pressure deficit, solar radiation and air temperature. Both approaches provided good predictions of canopy transpiration and explained 85% and 89% of the variance respectively. These two modeling methods offer a reasonable estimation of water use in the determination of water balance for land water resources planning, vegetation management and impact assessments of rehabilitation. | |||
TO cite this article:HAN Lei,HE Kangning,HU Xingbo, et al. Two Modeling Methods for Estimating Tree Canopy Transpiration with Sap Flow Technique[J]. |
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