Japan Geoscience Union Meeting 2018

Presentation information

[JJ] Oral

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

[A-CG40] Material Circulations in Land Ecosystems

Thu. May 24, 2018 10:45 AM - 12:15 PM 106 (1F International Conference Hall, Makuhari Messe)

convener:Tomomichi Kato(Research Faculty of Agriculture, Hokkaido University), Takashi Hirano(Research Faculty of Agriculture, Hokkaido University), Hisashi Sato(海洋研究開発機構 地球表層物質循環研究分野, 共同), Ryuichi Hirata(National Institute for Environmental Studies), Chairperson:Sato Hisashi(JAMSTEC)

11:00 AM - 11:15 AM

[ACG40-02] Influence of tree- thinning on long-term CO2 exchange over a larch forest

*Yoshiyuki Takahashi1, Nobuko Saigusa1, Ryuichi Hirata1, Naishen Liang1, Reiko Ide1, Munemasa Teramoto1 (1.Center for Global Environmental Research, National Institute for Environmental Studies)

Keywords:CO2, flux, disturbance, long-term observation

Larch forest is an important research object for evaluating CO2 uptake by forests because it is a common tree type of plantation that has been planted widespread over northeastern Japan. Quantifying the influence of the forest management on carbon budget in larch forests have 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 larch forests. Fuji Hokuroku Flux Observation Site was established 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 and 2015. The characteristics of CO2 exchange were affected from the human disturbance. Gross primary production (GPP) and ecosystem respiration (RE) of CO2 were remarkably decreased temporarily after the thinning. Consequently, both GPP and RE has recovered gradually. Net ecosystem production (NEP) has not fully recovered at 2017 to the level before the thinning because the speed of the recovery differs for GPP and RE. We will introduce the results of carbon fluxes and related parameters for the sites.