B23B-0605
Calculation of Individual Tree Water Use in a Bornean Tropical Rain Forest Using Individual-Based Dynamic Vegetation Model SEIB-DGVM
Tuesday, 15 December 2015
Poster Hall (Moscone South)
Taro Nakai1, Tomo'omi Kumagai1, Takami Saito1, Kazuho Matsumoto2, Tomonori Kume3, Michiko Nakagawa4 and Hisashi Sato5, (1)Nagoya University, Nagoya, Japan, (2)University of the Ryukyus, Faculty of Agriculture, Nishihara, Japan, (3)NTU National Taiwan University, Taipei, Taiwan, (4)Nagoya University, Graduate School of Bioagricultural Sciences, Nagoya, Japan, (5)JAMSTEC Japan Agency for Marine-Earth Science and Technology, Kanagawa, Japan
Abstract:
Bornean tropical rain forests are among the moistest biomes of the world with abundant rainfall throughout the year, and considered to be vulnerable to a change in the rainfall regime; e.g., high tree mortality was reported in such forests induced by a severe drought associated with the ENSO event in 1997-1998. In order to assess the effect (risk) of future climate change on eco-hydrology in such tropical rain forests, it is important to understand the water use of trees individually, because the vulnerability or mortality of trees against climate change can depend on the size of trees. Therefore, we refined the Spatially Explicit Individual-Based Dynamic Global Vegetation Model (SEIB-DGVM) so that the transpiration and its control by stomata are calculated for each individual tree. By using this model, we simulated the transpiration of each tree and its DBH-size dependency, and successfully reproduced the measured data of sap flow of trees and eddy covariance flux data obtained in a Bornean lowland tropical rain forest in Lambir Hills National Park, Sarawak, Malaysia.
