Rock-eating mycorrhizas: their role in plant nutrition and biogeochemical cycles |
| |
Authors: | Laura van Schöll Thomas W Kuyper Mark M Smits Renske Landeweert Ellis Hoffland Nico van Breemen |
| |
Institution: | (1) Institute for Water and Environmental Resource Management, University of Technology Sydney, P.O. Box 123, Broadway, Sydney, NSW, 2007, Australia;(2) Department of Physics and Advanced Materials, University of Technology Sydney, P.O. Box 123, Broadway, Sydney, NSW, 2007, Australia;(3) Department of Environmental Sciences, University of Technology Sydney, P.O. Box 123, Broadway, Sydney, NSW, 2007, Australia |
| |
Abstract: | Rates of water uptake by individual trees in a native Australian forest were measured on the Liverpool Plains, New South Wales,
Australia, using sapflow sensors. These rates were up-scaled to stand transpiration rate (expressed per unit ground area)
using sapwood area as the scalar, and these estimates were compared with modelled stand transpiration. A modified Jarvis-Stewart
modelling approach (Jarvis 1976), previously used to calculate canopy conductance, was used to calculate stand transpiration rate. Three environmental variables,
namely solar radiation, vapour pressure deficit and soil moisture content, plus leaf area index, were used to calculate stand
transpiration, using measured rates of tree water use to parameterise the model. Functional forms for the model were derived
by use of a weighted non-linear least squares fitting procedure. The model was able to give comparable estimates of stand
transpiration to those derived from a second set of sapflow measurements. It is suggested that short-term, intensive field
campaigns where sapflow, weather and soil water content variables are measured could be used to estimate annual patterns of
stand transpiration using daily variation in these three environmental variables. Such a methodology will find application
in the forestry, mining and water resource management industries where long-term intensive data sets are frequently unavailable. |
| |
Keywords: | Jarvis model of transpiration Canopy conductance Woodland |
本文献已被 SpringerLink 等数据库收录! |
|