TY - JOUR
T1 - Estimation of canopy water storage capacity from sap flow measurements in a Bornean tropical rainforest
AU - Kume, Tomonori
AU - Manfroi, Odair J.
AU - Kuraji, Koichiro
AU - Tanaka, Nobuaki
AU - Horiuchi, Toshinobu
AU - Suzuki, Masakazu
AU - Kumagai, Tomo'omi
N1 - Funding Information:
This work was supported by the CREST program of the JST (Japan Science and Technology Corporation). We would like to express our appreciation to Ms. Lucy Chong of the Forest Research Center, Sarawak Forestry Corporation, and Tohru Nakashizuka of Tohoku University for their sincere cooperation with our work in Lambir. Some of the equipment used was installed by Dr. Shinji Sawano of the National Institute for Agro-Environmental Sciences. We also thank assistant Prof. Norifumi Hotta of the University of Tokyo and Dr. Hikaru Komatsu of Kyushu University for their helpful comments.
PY - 2008/5/15
Y1 - 2008/5/15
N2 - Canopy water storage capacity (Sc) is a key parameter for estimations of rainfall interception using a big-leaf model (BLM). This study proposes a simple method for estimating Sc. The crucial factor in this method is the canopy drying time (or wet canopy duration) after rainfall. The time can be estimated from sap flow measurements in accordance with an earlier study of ours in a Bornean tropical rainforest. By using the estimated canopy drying time to calibrate a BLM for rainfall interception, we derived Sc. This method could also provide aerodynamic resistance (Ra). To validate our estimations, the derived parameters Sc and Ra were compared to Sc and Ra determined independently by a method based on net rainfall measurements on an event basis and on wind profile measurements, respectively. The parameters in our method (Sc = 0.7 mm, Ra = 14 s m-1) were shown to correspond well to the values determined by independent methods. Furthermore, the method proposed in this study is applicable to tropical forests where short canopy drying times can be expected after rainfall; that is, if the cloudy weather after rainfall becomes sunny within 250 min.
AB - Canopy water storage capacity (Sc) is a key parameter for estimations of rainfall interception using a big-leaf model (BLM). This study proposes a simple method for estimating Sc. The crucial factor in this method is the canopy drying time (or wet canopy duration) after rainfall. The time can be estimated from sap flow measurements in accordance with an earlier study of ours in a Bornean tropical rainforest. By using the estimated canopy drying time to calibrate a BLM for rainfall interception, we derived Sc. This method could also provide aerodynamic resistance (Ra). To validate our estimations, the derived parameters Sc and Ra were compared to Sc and Ra determined independently by a method based on net rainfall measurements on an event basis and on wind profile measurements, respectively. The parameters in our method (Sc = 0.7 mm, Ra = 14 s m-1) were shown to correspond well to the values determined by independent methods. Furthermore, the method proposed in this study is applicable to tropical forests where short canopy drying times can be expected after rainfall; that is, if the cloudy weather after rainfall becomes sunny within 250 min.
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U2 - 10.1016/j.jhydrol.2008.01.020
DO - 10.1016/j.jhydrol.2008.01.020
M3 - Article
AN - SCOPUS:40849116020
SN - 0022-1694
VL - 352
SP - 288
EP - 295
JO - Journal of Hydrology
JF - Journal of Hydrology
IS - 3-4
ER -