A review of evapotranspiration estimates from tropical forests in Thailand and adjacent regions
A review of evapotranspiration estimates from tropical forests in Thailand and adjacent regions
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DOI：
10.1016/j.agrformet.2008.01.011
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发表时间：
2008-05
影响因子：
6.2
通讯作者：
N. Tanaka;T. Kume;N. Yoshifuji;Katsunori Tanaka;Hideki Takizawa;K. Shiraki;C. Tantasirin;N. Tangtham-N
中科院分区：
文献类型：
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作者：
N. Tanaka;T. Kume;N. Yoshifuji;Katsunori Tanaka;Hideki Takizawa;K. Shiraki;C. Tantasirin;N. Tangtham-N
为了了解东南亚大陆季节性干燥的热带森林（热带季风森林）在区域气候系统中的潜在作用，我们简要描述了该地区复杂的森林类型，并回顾了已发表的研究报告热带季风森林和大气之间的水蒸气交换。此外，我们提出了未来的研究需要，以解决我们目前的知识基础的不足之处。大气蒸发量的季节变化在季风区很明显，通常随着大气水蒸气赤字和入射太阳辐射的增加而增加，在旱季后期达到最大值，在雨季达到相对较低的值。虽然回顾的研究数量有限，森林类型之间的蒸散（ET）的季节模式的比较表明，增加ET对应于大气蒸发的需求，在两个万年青森林生态系统，但不是在万年青和落叶森林生态系统。这种相反的ET季节性导致了森林类型之间旱季ET的显著差异，从一种万年青森林类型的0.6mmd-1到另一种万年青森林类型的5.9mmd-1不等。进一步调查根系深度和气孔导度的响应，个别树木干旱条件下的建议是必要的，得出一个更普遍的结论，旱季ET森林类型之间的差异。除蒸发量的季节变化外，降水量的年际波动及其季节分布也是该地区的重要特征。最近的物候学和生理学研究表明，这些年际变化的降雨量可以有显着影响的水和能量交换以上的热带季风森林。因此，我们强调有必要进一步审查热带季风森林和大气之间的水和能量交换的气候异常的影响。
To understand the potential roles of seasonally dry tropical forests (tropical monsoon forests) of mainland Southeast Asia in the regional climate system, we briefly describe the complex forest types in this region and review published studies which reported water vapour exchange between tropical monsoon forests and the atmosphere. In addition, we propose future research needs to address deficiencies in our current knowledge base. Seasonal variation in atmospheric evaporative demand, which generally increases with atmospheric water vapour deficit and incoming solar radiation, is conspicuous in this monsoon region, reaching maxima in the late dry season and relatively low values in the wet season. Though the number of reviewed studies is limited, a comparison of seasonal patterns of evapotranspiration (ET) between forest types shows increased ET corresponding with the atmospheric evaporative demand in two evergreen forest ecosystems, but not in both an evergreen and two deciduous forest ecosystems. This contrasting ET seasonality results in considerable differences in dry season ET among forest types, ranging from a low of 0.6mmd−1at one evergreen forest type, to 5.9mmd−1at another evergreen forest type. Further investigations of both rooting-depths and responses of stomatal conductance of individual trees to dry conditions are suggested to be necessary to draw a more general conclusion regarding dry season ET difference between forest types. Besides the seasonal changes in evaporative demand, inter-annual fluctuations of rainfall and its seasonal distribution are also significant in this region. Recent phenological and physiological studies suggest that these inter-annual variations in rainfall can have significant impacts on water and energy exchanges above the tropical monsoon forests. Thus, we stress the need for further examination of the effects of rainfall-regime anomalies on water and energy exchanges between tropical monsoon forests and the atmosphere.