Energy budget above a temperate mixed forest in northeastern China
文献类型：期刊论文
| 作者 | Wu, JB; Guan, DX; Han, SJ; Shi, TL; Jin, CJ; Pell, TF; Yu, GR; Guan, DX, Chinese Acad Sci, Inst Appl Ecol, Shenyang 110016, Peoples R China |
| 刊名 | HYDROLOGICAL PROCESSES
 |
| 出版日期 | 2007 |
| 卷号 | 21期号:18页码:2425-2434 |
| ISSN号 | 0885-6087 |
| 关键词 | Energy Budget Sensible Heat Flux Latent Heat Flux Eddy Covariance Technique Temperate Forest |
| 英文摘要 | Components of the energy budget were measured continuously above a 300-year-old temperate mixed forest at the Changbaishan site, northeastern China, from I January to 31 December 2003, as a part of the ChinaFlux programme. The albedo values above the canopy were lower than most temperate forests, and the values for snow-covered canopy were over 50% higher than for the snow-free canopy. In winter, net radiation R-n was generally less than 5% of the summer value due to high albedo and low incoming solar radiation. The annual mean latent heat LE was 37.5 W m(-2), accounting for 52% of Rn. The maximum daily evaporation was about 4.6 mat day(-1) in summer. Over the year, the accumulated precipitation was 578 mm; this compares with 493 mm of evapotranspiration, which shows that more than 85% of water was returned to the atmosphere through evapotranspiration. The LE was strongly affected by the transpiration activity and increased quickly as the broadleaved trees began to foliate. The sensible heat H dropped at that time, although Rn increased. Consequently, the seasonal variation in the Bowen ratio was clearly U-shaped, and the minimum value (0-1) occurred on a sunny day just after rain, when most of the available energy was used for evapotranspiration. Negative beta values occurred occasionally in the non-growing season as a result of intensive radiative cooling and the presence of water on the surface. The was very high (up to 13-0) in snow-covered winter, when evapotranspiration was small due to low surface temperature and available soil water. Vegetation phenology and soil moisture were the key variables controlling the available energy partitioning between H and LE. Energy budget closure averaged better than 86% on a half-hourly basis, with slightly greater closure on a daily basis. The degree of closure showed a dependence on friction velocity u*. Copyright (C) 2006 John Wiley & Sons, Ltd. |
| 学科主题 | Water Resources |
| 语种 | 英语 |
| WOS记录号 | WOS:000249265600003 |
| 公开日期 | 2011-09-23 |
| 源URL | [http://210.72.129.5/handle/321005/54627]  |
| 专题 | 沈阳应用生态研究所_沈阳应用生态研究所 |
| 通讯作者 | Guan, DX, Chinese Acad Sci, Inst Appl Ecol, Shenyang 110016, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wu, JB,Guan, DX,Han, SJ,et al. Energy budget above a temperate mixed forest in northeastern China[J]. HYDROLOGICAL PROCESSES,2007,21(18):2425-2434. |
| APA | Wu, JB.,Guan, DX.,Han, SJ.,Shi, TL.,Jin, CJ.,...&Guan, DX, Chinese Acad Sci, Inst Appl Ecol, Shenyang 110016, Peoples R China.(2007).Energy budget above a temperate mixed forest in northeastern China.HYDROLOGICAL PROCESSES,21(18),2425-2434. |
| MLA | Wu, JB,et al."Energy budget above a temperate mixed forest in northeastern China".HYDROLOGICAL PROCESSES 21.18(2007):2425-2434. |
入库方式： OAI收割
来源：沈阳应用生态研究所
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