抄録
Evapotranspiration (ET) was estimated from a planted coniferous forest in southwestern Japan by applying three methods: the eddy covariance method; the measurement of rainfall (P) and runoff (Q) in a small watershed; and a combination of rainfall interception loss (IC), upper canopy transpiration based on a sap-flux density measurement in Japanese cedar (Cryptomeria Japonica D. Don) stands (EUC), and modeled sub-canopy ET (ESC). After inverse multiplication of the energy imbalance ratio, ET by the eddy covariance method (ETEC) was 839.9mm in 2007 and 811.8mm in 2008. The yearly values of P-Q were partially affected by P in the previous autumn. After continuous data collection for more than 5years, P-Q became stable. The 9-year (2000-2008) average P-Q, which was considered most reliable in this study, was 897.5mmy-1. The cumulative ETEC during the daylight hours from the right stream bank, covered mainly with large Japanese cedars, was 894.1mm from April 2007 to March 2008. The value was almost the same as that calculated as the components sum (ETCOMP=IC+EUC+ESC: 911.4mm), and the comparison suggested that the annual totals of ETEC with an energy imbalance correction provide a reliable estimate of ET in a forest stand on a complex topography. Spatial variation in the watershed was likely caused by differences in soil water retention at each slope position. The slight difference in annual ETEC in 2007 compared with 2008 was attributed to differences in the radiative energy input. In the monthly-weekly analysis, ETCOMP was frequently higher than ETEC after heavy rainfall, while ETEC was higher under dry conditions and during active ET. Even under dry canopy conditions, daily ETEC was often higher than EUC+ESC. The results suggested a time-lag in evaporation from the ecosystem and/or under-estimated ETEC after rainfall.
| 元の言語 | 英語 |
|---|---|
| ページ（範囲） | 250-264 |
| ページ数 | 15 |
| ジャーナル | Journal of Hydrology |
| 巻 | 522 |
| DOI | |
| 出版物ステータス | 出版済み - 3 1 2015 |
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All Science Journal Classification (ASJC) codes
- Water Science and Technology
これを引用
Estimation of annual forest evapotranspiration from a coniferous plantation watershed in Japan (2) : Comparison of eddy covariance, water budget and sap-flow plus interception loss. / Shimizu, Takanori; Kumagai, Tomo'omi; Kobayashi, Masahiro; Tamai, Koji; Iida, Shin'ichi; Kabeya, Naoki; Ikawa, Reo; Tateishi, Makiko; Miyazawa, Yoshiyuki; Shimizu, Akira.
：: Journal of Hydrology, 巻 522, 01.03.2015, p. 250-264.研究成果: ジャーナルへの寄稿 › 記事
}
TY - JOUR
T1 - Estimation of annual forest evapotranspiration from a coniferous plantation watershed in Japan (2)
T2 - Comparison of eddy covariance, water budget and sap-flow plus interception loss
AU - Shimizu, Takanori
AU - Kumagai, Tomo'omi
AU - Kobayashi, Masahiro
AU - Tamai, Koji
AU - Iida, Shin'ichi
AU - Kabeya, Naoki
AU - Ikawa, Reo
AU - Tateishi, Makiko
AU - Miyazawa, Yoshiyuki
AU - Shimizu, Akira
PY - 2015/3/1
Y1 - 2015/3/1
N2 - Evapotranspiration (ET) was estimated from a planted coniferous forest in southwestern Japan by applying three methods: the eddy covariance method; the measurement of rainfall (P) and runoff (Q) in a small watershed; and a combination of rainfall interception loss (IC), upper canopy transpiration based on a sap-flux density measurement in Japanese cedar (Cryptomeria Japonica D. Don) stands (EUC), and modeled sub-canopy ET (ESC). After inverse multiplication of the energy imbalance ratio, ET by the eddy covariance method (ETEC) was 839.9mm in 2007 and 811.8mm in 2008. The yearly values of P-Q were partially affected by P in the previous autumn. After continuous data collection for more than 5years, P-Q became stable. The 9-year (2000-2008) average P-Q, which was considered most reliable in this study, was 897.5mmy-1. The cumulative ETEC during the daylight hours from the right stream bank, covered mainly with large Japanese cedars, was 894.1mm from April 2007 to March 2008. The value was almost the same as that calculated as the components sum (ETCOMP=IC+EUC+ESC: 911.4mm), and the comparison suggested that the annual totals of ETEC with an energy imbalance correction provide a reliable estimate of ET in a forest stand on a complex topography. Spatial variation in the watershed was likely caused by differences in soil water retention at each slope position. The slight difference in annual ETEC in 2007 compared with 2008 was attributed to differences in the radiative energy input. In the monthly-weekly analysis, ETCOMP was frequently higher than ETEC after heavy rainfall, while ETEC was higher under dry conditions and during active ET. Even under dry canopy conditions, daily ETEC was often higher than EUC+ESC. The results suggested a time-lag in evaporation from the ecosystem and/or under-estimated ETEC after rainfall.
AB - Evapotranspiration (ET) was estimated from a planted coniferous forest in southwestern Japan by applying three methods: the eddy covariance method; the measurement of rainfall (P) and runoff (Q) in a small watershed; and a combination of rainfall interception loss (IC), upper canopy transpiration based on a sap-flux density measurement in Japanese cedar (Cryptomeria Japonica D. Don) stands (EUC), and modeled sub-canopy ET (ESC). After inverse multiplication of the energy imbalance ratio, ET by the eddy covariance method (ETEC) was 839.9mm in 2007 and 811.8mm in 2008. The yearly values of P-Q were partially affected by P in the previous autumn. After continuous data collection for more than 5years, P-Q became stable. The 9-year (2000-2008) average P-Q, which was considered most reliable in this study, was 897.5mmy-1. The cumulative ETEC during the daylight hours from the right stream bank, covered mainly with large Japanese cedars, was 894.1mm from April 2007 to March 2008. The value was almost the same as that calculated as the components sum (ETCOMP=IC+EUC+ESC: 911.4mm), and the comparison suggested that the annual totals of ETEC with an energy imbalance correction provide a reliable estimate of ET in a forest stand on a complex topography. Spatial variation in the watershed was likely caused by differences in soil water retention at each slope position. The slight difference in annual ETEC in 2007 compared with 2008 was attributed to differences in the radiative energy input. In the monthly-weekly analysis, ETCOMP was frequently higher than ETEC after heavy rainfall, while ETEC was higher under dry conditions and during active ET. Even under dry canopy conditions, daily ETEC was often higher than EUC+ESC. The results suggested a time-lag in evaporation from the ecosystem and/or under-estimated ETEC after rainfall.
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U2 - 10.1016/j.jhydrol.2014.12.021
DO - 10.1016/j.jhydrol.2014.12.021
M3 - Article
AN - SCOPUS:84923008500
VL - 522
SP - 250
EP - 264
JO - Journal of Hydrology
JF - Journal of Hydrology
SN - 0022-1694
ER -