| Wet Canopy Evaporation Rate of Three Stands in Western Sichuan, China |
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| 作者姓名： | YANGWanqin WANGKaiyun SeppoKellomaki XIAOLing |
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| 作者单位： | [1]ChengduInstituteofBiology,ChineseAcademyofSciences,Chengdu610041,China [2]UniversityofJoensuu,FacultyofForestry,P.O.Box111,FIN-80101,Finland |
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| 摘 要： | 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 to0.487 mm h^-1), 0.242 mm h^-1 (from 0.068 to 0.711 mm 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 to16:00 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.
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| 关 键 词： | 潮湿遮篷 蒸发速率 亚高山带森林 模型 气象变量 云杉 冷杉 桦树 四川西部 |
Wet canopy evaporation rate of three stands in Western Sichuan,China |
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| YANGWanqin WANGKaiyun SeppoKellomaki XIAOLing.Wet Canopy Evaporation Rate of Three Stands in Western Sichuan, China[J].Journal of Mountain Science,2004,1(2):166-174. |
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| Authors: | Wanqin Yang Kaiyun Wang Kellomäki Seppo Ling Xiao |
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| Institution: | (1) Chengdu Institute of Biology, Chinese Academy of Sciences, 610041 Chengdu, China;(2) Faculty of Forestry, University of Joensuu, P.O. Box 111, FIN-80101, Finland |
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| Abstract: | The wet canopy evaporation rate (Er) wascalculated by Penman-Monteith combination model based on three assumptions and with meteorological variables 2 m above the canopy inthree stands, dominated by spruce (SF), fir (FF) and birch (BF) trees, respectively(,)( )]in the subalpineforests in western Sichuan, China over a growingseason. The total amount of the E was 44.5 mm forSF, 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 togross rainfall for FF compared with SF and BF.Mean Er was 0.097 mm h-1 (ranging from 0.028 to0.487 mm h-1), 0.242 mm h-1 (from 0.068 to 0.711 mm h-1) and 0.149 mm h-1 (from 0.060 to 0.576 mm h-1for SF, FF and BF, respectively. The highest average monthly Er occurred in June was 0.120 mm h-1 forSF, 0.317 mm h-1 for 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 16:00were significantly higher than those from 0:00 to8:00 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 thecanopy. |
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| Keywords: | Wet canopy evaporation ratemeteorological variable Penman-Monteith equation subalpine forest western Sichuan |
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