Two Modeling Methods for Estimating Tree Canopy Transpiration with Sap Flow Technique

HAN Lei; HE Kangning; HU Xingbo; ZHANG Dong; QIN Jing

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Two Modeling Methods for Estimating Tree Canopy Transpiration with Sap Flow Technique

HAN Lei 1 #,HE Kangning 2 *,HU Xingbo 2,ZHANG Dong 2,QIN Jing 2

1.School of Soil and Water Conservation, Beijing Forestry University

2.School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083

*Correspondence author

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Funding: The Doctoral Program Foundation of Institutions of Higher Education of China （No.No. 20070022028) and the 11th Five Scientific & Technological Sustaining Research Program of China）

Opened online: 4 January 2011

Accepted by: none

Citation: HAN Lei,HE Kangning,HU Xingbo.Two Modeling Methods for Estimating Tree Canopy Transpiration with Sap Flow Technique[OL]. [ 4 January 2011] http://en.paper.edu.cn/en_releasepaper/content/4401496

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.

Keywords:canopy conductance;transpiration;sap flow;model;Platycladus orientalis

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