Year-to-Year Differences in Sap Flow and Crown-Level Stomatal Conductance of Two Species in a Lowland Evergreen Forest, Central Cambodia
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概要
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Although information about the hydrologic and ecological features of lowland evergreen forests in central Cambodia has been collected since the beginning of the 21st century, measurements of the transpiration process remain very limited. This paper describes the differences detected in transpiration (q) and crown-level stomatal conductance (GS) between Calophyllum inophyllum (which undergoes successive leaf exchange) and Drypetes sp. (which performs irregular leaf exchange) (hereafter referred to as Calophyllum and Drypetes, respectively), and the analysis of these differences in consideration of their contrasting leaf phenologies. We evaluated q using sap flow measurements and obtained daily GS values. Calophyllum and Drypetes had high and low periods between which q and GS differed significantly. Within high/low periods, smaller scatter in the plot of GS versus vapour pressure deficit (D) was found in Calophyllum compared to Drypetes. For a given value of D, q in high periods was 1.3 and 1.9 times larger than in low periods for Calophyllum and Drypetes, respectively. The smaller scatter for Calophyllum was the result of relatively constant physiological activity that was maintained by successive leaf fall.For both species, high periods were recorded after remarkable leaf-fall events; thus, our current data implied that leaf phenology is one of the most important factors affecting transpiration.
著者
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Shimizu Takanori
Department Of Civil And Ocean Engineering Ehime University
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Shimizu Akira
Kyushu Research Center Forestry And Forest Products Research Institute
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Tamai Koji
Department Of Forest Site Environment Forestry And Forest Products Research Institute
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TAMAI Koji
Department of Soil and Water Conservation, Forestry and Forest Products Research Institute (FFPRI)
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KABEYA Naoki
Kyushu Research Center, Forestry and Forest Products Research Institute (FFPRI)
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KETH Nang
Forest-Wildlife Research and Development Institute, Forestry Administration
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CHANN Sophal
Forest-Wildlife Research and Development Institute
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SHIMIZU Takanori
Department of Soil and Water Conservation, Forestry and Forest Products Research Institute (FFPRI)
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ITO Eriko
Hokkaido Research Center, FFPRI
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NOBUHIRO Tatsuhiko
Department of Soil and Water Conservation, Forestry and Forest Products Research Institute (FFPRI)
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ARAKI Makoto
Bureau of Climate Change, FFPRI
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KABEYA Naoki
Kyushu Research Center, FFPRI
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IIDA Shin'ichi
Department of Soil and Water Conservation, Forestry and Forest Products Research Institute (FFPRI)
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