国立研究開発法人 国際農林水産業研究センター | JIRCAS

Year-to-Year Differences in Sap Flow and Crown-Level Stomatal Conductance of Two Species in a Lowland Evergreen Forest, Central Cambodia

JARQ : Japan Agricultural Research Quarterly
ISSN
00213551
書誌レコードID(総合目録DB)
AA0068709X
本文フルテキスト

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.

刊行年月2013-07-01
作成者IIDA Shin'ichiITO ErikoSHIMIZU AkiraNOBUHIRO TatsuhikoSHIMIZU TakanoriKABEYA NaokiTAMAI KojiARAKI MakotoCHANN SophalKETH Nang
著者キーワード

leaf phenology

riparian zone

sap flux density

transpiration

vapour pressure deficit

公開者Japan International Research Center for Agricultural Sciences
データ作成日2013-07-01
国立情報学研究所メタデータ主題語彙集(資源タイプ)Journal Article
47
3
開始ページ319
終了ページ327
DOI10.6090/jarq.47.319
権利Japan International Research Center for Agricultural Sciences
言語eng