Seasonal Variation of CO2 flux over a broadleaf deciduous forest.

Yasuda, Yukio; Watanabe, Tsutomu; Ohtani, Yoshikazu; Okano, Michiaki; Nakayama, Keiichi I.

doi:10.3178/jjshwr.11.575

Cited by 18 publications

(11 citation statements)

References 15 publications

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“…Samples were taken every 0.2 s after confirming that the frequency band that contributed to the transport was lower than 0.1 Hz. The CO 2 flux-measuring system used at this site was originally designed and tested at another site by Yasuda et al (1998), and was subsequently modified for long-term flux monitoring, including studies at the site in this study and other Forestry and Forest Products Research Institute FluxNet sites (Ohtani et al 2001).…”

Section: Field Measurementsmentioning

confidence: 99%

Seasonal and interannual variation in net ecosystem production of an evergreen needleleaf forest in Japan

Mizoguchi

Ohtani

Takanashi

et al. 2012

Journal of Forest Research

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Carbon dioxide (CO 2 ) flux was measured above the forest at the Fujiyoshida site on the northern slope of Mount Fuji in Japan in 2000-2008 using an eddy covariance technique. The forest mainly consists of Japanese red pine (Pinus densiflora) and Japanese holly (Ilex pedunculosa). The 9-year average of monthly mean net ecosystem production (NEP) ranged from -0.1 g C m -2 day -1 in January to 2.5 g C m -2 day -1 in May. The maximum net uptake was observed in May, although gross primary production (GPP) was highest in July. Variation in the leaf amount did not notably affect seasonal variation in GPP. This site was characterized by carbon uptake even in winter, if the meteorological conditions were conducive for photosynthesis and a resulting long period of carbon uptake. The 9-year averages of annual NEP, GPP, and ecosystem respiration (RE) were 388, 1,802, and 1,413 g C m -2 year -1 , respectively. The annual NEP was lowest in 2003 and highest in 2004 over the 9 years. Year-to-year variability of NEP mainly depended on air temperature and photosynthetically active radiation in summer, and the dependence of the deviation of annual NEP on that of GPP was greater than that of RE. Long-term observational data indicated that the carbon uptake ability at the study site was at a moderate level in comparison with other temperate humid evergreen forests around the world. These data also indicated that the site had a high carbon uptake ability compared with other deciduous forests in Japan because of the duration of carbon uptake.

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Section: Field Measurementsmentioning

confidence: 99%

Seasonal and interannual variation in net ecosystem production of an evergreen needleleaf forest in Japan

Mizoguchi

Ohtani

Takanashi

et al. 2012

Journal of Forest Research

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“…Seasonality of NEP, GPP, and R E The seasonal pattern of NEP variations observed at the API study site is typical for deciduous broad-leaved forests (Greco and Baldocchi 1996;Valentini et al 1996;Yasuda et al 1998). The seasonal pattern of NEP was determined by the balance of GPP and R E , as shown in Figs.…”

Section: Discussionmentioning

confidence: 99%

“…On local scales, characteristics of temporal variability in carbon balance have been obtained from many long-term observations at a variety of sites; these results showed the occurrence of seasonal variations in NEP (Goulden et al 1996b;Baldocchi et al 1997;Yasuda et al 1998;Aubinet et al 2002;Carrara et al 2003;Ohtani et al 2005), GPP, and R E (Goulden et al 1996a;Law et al 2000;Saigusa et al 2002;Carrara et al 2004;Dunn et al 2007;Hirata et al 2007) according to forest type and climatic conditions. Such long-term observations have revealed interannual variations of carbon balance in forest ecosystems, and relationships between these variations and climatic or environmental factors have been analyzed.…”

Section: Introductionmentioning

confidence: 97%

Carbon balance in a cool–temperate deciduous forest in northern Japan: seasonal and interannual variations, and environmental controls of its annual balance

Yasuda

Saito

Hoshino

et al. 2012

Journal of Forest Research

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We monitored variation in seasonal and annual net ecosystem production (NEP), gross primary production (GPP), and ecosystem respiration (R E ) based on 7-year eddy covariance measurements above a cool-temperate deciduous broad-leaved forest (Japanese beech forest). The 7-year means (±SD) of annual NEP, GPP, and R E were 312 ± 64, 1250 ± 62, and 938 ± 36 g C m -2 year -1 , respectively. Variation in NEP was much larger than variation in GPP and R E . During the growing season, the main factor controlling carbon balance was air temperature; variation in seasonal integrated NEP was regulated by accumulated air temperature (degree-day) with a significant negative correlation, whereas the seasonal ratio of R E to GPP was correlated positively with accumulated air temperature. Because the deviation of seasonal NEP was also significantly correlated with seasonal R E /GPP, NEP was controlled by R E /GPP, depending on air temperature during the growing season. Seasonal R E in the defoliation and snow seasons was also important for evaluating the annual carbon balance, because the total number of days in the two seasons was quite large owing to a long snowy winter. In the defoliation and snow seasons, we found defoliation season length was a major factor determining seasonal integrated R E , illustrating the positive correlation between R E and defoliation season length. The major factors controlling interannual variations in forest carbon balance are discussed.

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“…In previous reports (Sawamoto et al 2000(Sawamoto et al , 2001, soil respiration was measured near Yakutsk City, far eastern Siberia, in 1997 and1998. In eastern Siberia, including the Yakutsk region, low precipitation in spring causes frequent forest fires (Valendik 1996), which release carbon dioxide into the atmosphere directly (Dixon and Krankina 1993), and markedly affect forest regeneration (Matveev and U soltzev 1996) and carbon cycling in the Taiga ecosystem.…”

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confidence: 99%

Changes in net ecosystem production associated with forest fire in taiga ecosystems, near Yakutsk, Russia

Sawamoto

Hatano

Shibuya

et al. 2003

Soil Science and Plant Nutrition

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Seasonal Variation of CO2 flux over a broadleaf deciduous forest.

Cited by 18 publications

References 15 publications

Seasonal and interannual variation in net ecosystem production of an evergreen needleleaf forest in Japan

Seasonal and interannual variation in net ecosystem production of an evergreen needleleaf forest in Japan

Carbon balance in a cool–temperate deciduous forest in northern Japan: seasonal and interannual variations, and environmental controls of its annual balance

Changes in net ecosystem production associated with forest fire in taiga ecosystems, near Yakutsk, Russia

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