Hydro-Meteorological Studies Based on Field Observations at Tropical Monsoon Forests in Northern Thailand: Current Status of Knowledge and Future Research Needs

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  • TANAKA Nobuaki
    Japan Science and Technology Agency Graduate School of Agriculture and Life Sciences, The University of Tokyo
  • KUME Tomonori
    Graduate School of Agriculture and Life Sciences, The University of Tokyo Kasuya Research Forest, Kyushu University
  • YOSHIFUJI Natsuko
    Japan Science and Technology Agency Graduate School of Agriculture and Life Sciences, The University of Tokyo
  • TANAKA Katsunori
    Frontier Research Center for Global Change
  • TAKIZAWA Hideki
    College of Bioresource Sciences, Nihon University
  • SHIRAKI Katsushige
    Department of Ecoregion Sciences, Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • KOSAKA Izumi
    College of Bioresource Sciences, Nihon University
  • TANTASIRIN Chatchai
    Faculty of Forestry, Kasetsart University
  • TANGTHAM Nipon
    Faculty of Forestry, Kasetsart University
  • SUZUKI Masakazu
    Graduate School of Agriculture and Life Sciences, The University of Tokyo

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Other Title
  • タイ北部の熱帯季節林における現地観測をベースにした水文気象研究　―既往研究の整理と今後の課題―
  • タイ ホクブ ノ ネッタイ キセツリン ニ オケル ゲンチ カンソク オ ベース ニ シタ スイモン キショウ ケンキュウ キオウ ケンキュウ ノ セイリ ト コンゴ ノ カダイ

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Abstract

This paper describes an ecological classification of tropical monsoon forests in northern Thailand and reviews published hydro-meteorological studies conducted at each forest type. As a result of summarizing current status of knowledge, we found that basic hydro-meteorological aspects, i.e. seasonal variation in energy partitioning throughout a year with normal climatological condition, at most of the forest types in the region has been already studied. Also, we found a clear contrast in evapotranspiration in the dry season between forest types. The contrast might be one of notable characteristics of hydro-meteorology in tropical monsoon forests in the region. Inter-annual variations in both rainfall and its seasonal distribution might be significantly large in this region, leading to occasional severe droughts and irregular ecological rhythms of trees. Recent findings from several study sites imply that the variations in rainfall result in phenological and physiological responses of the studied forest ecosystems. These responses in turn may affect the exchanges of energy, water vapour, and carbon between forest ecosystems in the region and the atmosphere. Such effects of temporal variations in rainfall on the tropical monsoon forests have been poorly understood thus far. We, therefore, stress the necessity of further efforts to examine the ecological and hydro-meteorological responses of all tropical monsoon forests to the inter-annual variation in rainfall and its seasonal distribution.

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