Canopy transpiration response to environmental variations in Platycladus orientalis: properties and modelling . | [Pakistan Journal of Botany • 2012]

Author(s):

1. Lei Han: College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China; New Technology Application and Research Center, Ningxia University, Yinchuan 750021, China

2. Kangning He: College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China

3. Xingbo Hu: College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China

4. Dong Zhang: College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China

Abstract:

Regrowth of tall, dense forests consumes more water, with the result that catchment yield may decline and even soil desiccation occurred especially in the semi-arid Loess Plateau of China. In this study, meteorological measurements combined with sap flow techniques provided a low-cost option to study the rates of water uptake by individual trees of Platycladus orientalis response to environmental factors on a continuous basis. A series of environmental control functions: vapour pressure deficit, solar radiation and air temperature were used to characterize canopy transpiration (Ec). A Jarvis-type model, modified to directly estimate the Ec rather than canopy conductance, explained 89% of the variation observed in Ec. Cross validation shows that this model provided good predictions of canopy transpiration for P. orientalis. Such a methodology offers a reasonable estimation of water use in the determination of water balance for land water resources planning, vegetation management and impact assessments of rehabilitation.

Page(s): 541-545

DOI: DOI not available

Published: Journal: Pakistan Journal of Botany, Volume: 44, Issue: 2, Year: 2012

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