Effect of soil moisture on canopy conductance of Amazonian rainforest

被引：99

作者：

Harris, PP ^{[1
]}

Huntingford, C

Cox, PM

Gash, JHC

Malhi, Y

机构：

[1] Ctr Ecol & Hydrol, Wallingford OX10 8BB, Oxon, England

[2] Meteorol Off, Hadley Ctr, Bracknell RG12 2SY, Berks, England

[3] Univ Edinburgh, Sch Geosci, Edinburgh, Midlothian, Scotland

来源：

AGRICULTURAL AND FOREST METEOROLOGY | 2004年 / 122卷 / 3-4期

基金：

英国自然环境研究理事会;

关键词：

Amazonia; soil moisture; conductance; evaporation;

D O I：

10.1016/j.agrformet.2003.09.006

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

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 465 m(3) m(-3), which was comparable with estimates from soil hydraulic properties. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：215 / 227

页数：13