Transpiration from a Cryptomeria japonica plantation, part 2: Responses of canopy conductance to meteorological factors

Hikaru Komatsu, Yihuei Kang, Tomonori Kume, Natsuko Yoshifuji, Norifumi Hotta

研究成果: ジャーナルへの寄稿学術誌査読

38 被引用数 (Scopus)

抄録

To our knowledge, there is no information on the canopy conductance of Cryptomeria japonica plantations, although such forests are very common in Japan. We examined the canopy conductance Gc of a C. japonica plantation based on 1-year sap-flow data using the simplified Penman-Monteith equation. After selecting data based on the criterion proposed in part 1 of this study (Komatsu et al., 2006. Hydrological Processes 20: this issue), we now examine Gc responses to meteorological factors. Gc was expressed using functions of solar radiation S (W m-2), the vapour pressure deficit D (kPa), and air temperature T (°C). The resulting functions were f1 (S) = [(1000 + 30)S]/[1000(S + 30)], f2(D) = exp(-0.54D)/exp (-0.54), and f3(T) = {[(30 - 5) + 14](T - 5)}/1{(30 - 5) [(T - 5) + 14]}, where f1(S), f2(D), and f3(T) are functions expressing the Gc responses to S, D, and T respectively. The functions were characterized by comparing general functions for coniferous forests, which showed that it was necessary to consider f3(T) to reproduce the 1-year transpiration at the site, and that f1(S) and f2(D) determined here were not very different from the general functions. This paper is the first to determine Gc responses to meteorological fa ctors for a C. japonica plantation. When predicting transpiration from a C. japonica plantation using hydrological or ecological models, the functions determined here should be used instead of the default functions of the models.

本文言語英語
ページ(範囲)1321-1334
ページ数14
ジャーナルHydrological Processes
20
6
DOI
出版ステータス出版済み - 4月 15 2006
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 水の科学と技術

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