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Wet Canopy Evaporation Rate of Three Stands in Western Sichuan,China

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The wet canopy evaporation rate (Er) was calculated by Penman-Monteith combination model based on three assumptions and with meteorological variables 2 m above the canopy in three stands, dominated by spruce (SF), fir (FF) and birch (BF) trees, respectively, in the subalpine forests in western Sichuan, China over a growing season. The total amount of the E was 44.5 mm for SF, 88.5 mm for FF and 57.8 mm for BF, accounting for 9.2%, 16.6% and 10.2% of the gross rainfall,respectively, in the measuring period. There was the highest average monthly Er and percentage of E to gross rainfall for FF compared with SF and BF.Mean Er was 0.097 mm h-1 (ranging from 0.028 to 0.487 mm h-1), 0.242 mm h-1 (from 0.068 to 0.711mm h-1) and 0.149 mm h-1 (from 0.060 to 0.576 mm h-1) for SF, FF and BF, respectively. The highest average monthly Er occurred in June was 0.120 mm h-1 for SF, 0.317 mm h-1for FF and 0.169 mm h-1 for BF, and the lowest value in October was 0.083 mm h-1 for SF, 0.187 mm h-1 for FF and 0.101 mm h-1 for BF, respectively. The averages of Er from 8:00 to 16:00 were significantly higher than those from 0:00 to 8:00 and from 16:00 to 0:00 for the three stands. The marked daily and monthly differences of Er were contributable to the variations of solar radiation, air temperature and relative humidity above the canopy.

Wet canopy evaporation ratemeteorological variablePenman-Monteith equationsubalpine forestwestern Sichuan

Yang Wanqin、Wang Kaiyun、Seppo Kellom(a)ki、XIAO Ling

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ChengduInstituteofBiology, Chinese Academy of Sciences, Chengdu 610041, China

University of Joensuu, Faculty of Forestry, P.O. Box 111, FIN-80101, Finland

China-Finland Cooperation Project "Responses of the Ecosystem Processes of High-Frigid Coniferous Forest to Climate"Key Project of Ecology and Environment in West China国家自然科学基金中国科学院"百人计划"

302113050490201010

2004

山地科学学报(英文版)
中国科学院水利部成都山地灾害与环境研究所

山地科学学报(英文版)

影响因子：0.228
ISSN：1672-6316
年,卷(期)：2004.1(2)
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