Modelling canopy conductance under wet and dry conditions in a subtropical cloud forest
Abstract
Canopy conductance (g c) in a ridge-top cloud forest in the Garajonay National Park on La Gomera (Canary Islands) was derived by using the Jarvis-Stewart multiplicative algorithm and validated by inverting the Penman-Monteith equation using measured sap-flow data for the two main species, Myrica faya (beech) and Erica arborea (tree-heath). Canopy conductance correlated well with global radiation and vapour pressure deficit, and the multiplicative algorithm reproduced the daytime and seasonal course of g c satisfactorily using only these two factors under moderate and high evaporative conditions. There was no significant relation between soil moisture content in the first 0.3 m and g c, even though topsoil moisture reached very low values in summer, suggesting the roots had access to water at deeper levels.
- Publication:
-
Agricultural and Forest Meteorology
- Pub Date:
- 2009
- DOI:
- 10.1016/j.agrformet.2009.03.008
- Bibcode:
- 2009AgFM..149.1565G
- Keywords:
-
- Canopy conductance;
- Transpiration;
- Jarvis-Stewart model;
- Cloud forest;
- Fayal-brezal;
- Canary Islands