Effect of soil moisture on canopy conductance of Amazonian rainforest

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• 作者：Harris ; Philip P. ; Huntingford ; Chris ; Cox ; Peter M. ; Gash ; John H.C. ; Malhi ; Yadvinder
• 关键词：Amazonia ; Soil moisture ; Conductance ; Evaporation
• 刊名：Agricultural and Forest Meteorology
• 出版年：2004
• 期刊代码：2_01681923
• 类别：abs
• 出版时间：April 20, 2004
• 卷：122
• 期：3-4
• 页码：215-227
• 文件大小：288 K

摘要

Estimates of canopy conductance, g_c, were derived from hourly eddy-covariance measurements of evaporation for a primary forest site near Manaus, Brazil, using an inverted Penman–Monteith equation. These data were used to calibrate Jarvis-type models of canopy conductance including and excluding a soil moisture dependence. A period of low canopy conductance in the observations coincided with low soil moisture and high humidity deficit. The model was able to capture this decrease in diurnal maximum g_c only when a soil moisture dependence was included. The optimised value of wilting point in the soil moisture function was 465m³m⁻³, which was comparable with estimates from soil hydraulic properties.