Two Modeling Method for Estimating Tree Canopy Transpiration with Sap Flow Technique
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.
Canopy conductance transpiration Sap flow model Platycladus orientalis
Lei Han Kangning He Xingbo Hu Dong Zhang Jin Qin
College of Soil and Water Conservation, Beijing Forestry University, Beijing, P. R. China
国际会议
昆明
英文
444-448
2010-10-17（万方平台首次上网日期，不代表论文的发表时间）