Japan Geoscience Union Meeting 2016

Presentation information


Symbol A (Atmospheric and Hydrospheric Sciences) » A-CG Complex & General

[A-CG22] Material Circulations in Land Ecosystems

Wed. May 25, 2016 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall HALL6)

Convener:*Tomomichi Kato(Research Faculty of Agriculture, Hokkaido University), Takashi Hirano(Research Faculty of Agriculture, Hokkaido University), Hisashi Sato(Department of Environmental Geochemical Cycle Research, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)), Ryuichi Hirata(National Institute for Environmental Studies)

5:15 PM - 6:30 PM

[ACG22-P08] Influence of natural and human disturbances on long-term CO2 exchange over larch forests

*Yoshiyuki Takahashi1, Nobuko Saigusa1, Ryuichi Hirata1, Naishen Liang1, Reiko Ide1, Kentaro Takagi2, Takashi Hirano3 (1.Center for Global Environmental Research, National Institute for Environmental Studies, 2.The Field Science Center for Northern Biosphere, Hokkaido University, 3.Graduate School of Agriculture, Hokkaido University)

Keywords:CO2, flux, disturbance, larch, monitoring

Larch forest is an important research object for evaluating ecosystem response against future global warming because it is a representative vegetation type for high latitudinal northeast Eurasia where greater temperature rise due to climate change is anticipated. In Japan, Larch is a common tree type of plantation that has been planted widespread over northeastern Japan especially after World War II. However, many larch forests have been left unmanaged because of the sluggish lumber demand. Quantifying the influence of the forest management on carbon budget in larch forests has significance on the securement of forests as a source of CO2 absorption.
Thus, National Institute for Environmental Studies (NIES) has implemented long-term monitoring program of CO2 exchange over three domestic larch forests in association with Hokkaido University. We established the Fuji Hokuroku Flux Observation Site in the foothills of Mt. Fuji as an alternative base for monitoring, and began observations in January 2006. The site is dominated by larch trees of more than 50 year-old. 30% thinning was conducted at the site in spring of year 2014. Tomakomai Flux Research site was established in 1999 to carry out integrated monitoring on the carbon budget in a mature larch forest. However, the site was devastated by the typhoon in 2004. Flux observation at the site is ongoing after the typhoon disturbance.
We began observations of the effects of canopy opening on a larch forest ecosystem structure in 2001 at a mixed forest in Teshio experimental forest of Hokkaido University. The forest was clear-cut and planted with larch trees in 2003. We monitor and evaluate the changes in carbon budget and forest ecosystem structure. Those three observation sites were affected from different kinds of natural and human disturbance. We will introduce the comparison results of carbon fluxes and related parameters for the sites.