Seasonality of water and carbon dioxide exchanges at a teak plantation in northern Thailand
Seasonality of water and carbon dioxide exchanges at a teak plantation in northern Thailand
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DOI：
10.1002/eco.284
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发表时间：
2013-02
期刊：
影响因子：
2.6
通讯作者：
Yasunori Igarashi;N. Tanaka;Katsunori Tanaka;N. Yoshifuji;Takanori Sato;C. Tantasirin;Masakazu Suzuki
中科院分区：
文献类型：
--
作者：
Yasunori Igarashi;N. Tanaka;Katsunori Tanaka;N. Yoshifuji;Takanori Sato;C. Tantasirin;Masakazu Suzuki
本研究的目的是阐明在热带落叶林网站，即在泰国北方的柚木种植园的净辐射到感热通量和潜热通量和二氧化碳（CO2）通量的能量分区的季节模式。一般来说，在湿（生长）季，潜热通量比感热通量更突出，而在干（休眠）季，感热是排放到大气中的能量的主要形式。更特别的是，潜热通量在柚木落叶前开始增加，比落叶开始早1个月下降。白天的净CO2吸收量增加，但只有在雨季开始时，增加的叶子，值达到峰值，在雨季的早期，此后下降。这种下降比潜热通量开始下降早约3个月，比落叶开始早约4个月。这些结果表明，大气和热带落叶林之间的水和CO2交换的季节性基本上解耦在湿季后期。这种脱钩的季节性的水和碳交换可能是特别重要的模拟生态水文学的热带落叶林。版权所有© 2012约翰威利父子有限公司.
The object of this study was to elucidate the seasonal patterns of energy partitioning of net radiation into sensible and latent heat fluxes and carbon dioxide (CO2) flux at a tropical deciduous forest site, i.e. a teak plantation in northern Thailand. In general, latent heat flux was more prominent than sensible heat flux in the wet (growing) season, whereas in the dry (dormant) season, sensible heat was the main form of energy emitted to the atmosphere. More specially, latent heat flux began to increase before leaf‐out of teak trees and decreased 1 month earlier than leaf‐fall initiation. Daytime net CO2 uptake appeared to increase with increasing amount of leaves but only at the beginning of the wet season; values peaked during the early part of wet season; and declined thereafter. This decline occurred about 3 months earlier than when latent heat flux began to decrease about 4 months earlier than the leaf‐fall initiation. These results indicate that the seasonality of water and CO2 exchanges between the atmosphere and the tropical deciduous forest was substantially decoupled during the late wet season. This decoupling of the seasonality of water and carbon exchanges may be particularly important when modelling the ecohydrology of this tropical deciduous forest. Copyright © 2012 John Wiley & Sons, Ltd.