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The CO2 flux from coarse woody debris (RCWD) in a deciduous broad-leaved forest was measured using chamber measurements. The relationships between RCWD and environmental factors, such as temperature (T) and the water content (θ) of the coarse woody debris (CWD), were determined from long-term continuous measurements. Measurements of the RCWD of many CWD samples revealed relationships between RCWD and CWD characteristics, such as wood density (ρ) and diameter (D). A field survey conducted in 2003 estimated the mass of CWD as 9.30tC·ha-1, with snags amounting to 60% of the total CWD mass. Scaling RCWD to the ecosystem while considering environmental factors according to the type (snag or log) of CWD and CWD characteristics, we estimated that the annual RCWD in the forest was 0.50tC·ha-1·y-1 in 2003. This came to 13-19% of the total heterotrophic respiration in the forest. The mean annual CWD input mass from 2000 to 2004 was 0.61tC·ha-1·y-1. Therefore, 0.11tC·ha-1·y-1 were sequestered by CWD, which amounted to 7% of the net ecosystem production (NEP) in the forest. In a younger forest, it is difficult to assume that the CWD input and decomposition are balanced, so the RCWD and CWD input mass should be quantified to evaluate the forest carbon cycle and NEP.



Author: M. Jomura, Y. Kominami, K. Tamai, T. Miyama, et al (majomura at mbox dot kyoto-inet dot or dot jp)
Filesize: 182.40 Kb


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     Talk History
Friday, September 30
· Discussion Panel
· Nitrogen Regulation of Carbon Sequestration in Terrestrial Ecosystems in Respons
· The Role of Water Relations in Driving Grassland Ecosystem Responses to Rising A
· Unraveling the Decline in High-latitude Surface Ocean Carbonate
Thursday, September 29
· Hazards of Temperature on Food Availability in Changing Environments (HOT-FACE)
· The Amazon and the Modern Carbon Cycle
· New Coupled Climate-carbon Simulations from the IPSL Model
· The Changing Carbon Cycle
· What are the Most Important Factors for Climate-carbon Cycle Coupling?
· CO2 Uptake of the Marine Biosphere
· European-wide Reduction in Primary Productivity Caused by the Heat and Drought i
· Persistence of Nitrogen Limitation over Terrestrial Carbon Uptake
· Atmospheric CO2, Carbon Isotopes, the Sun, and Climate Change over the Last Mill
· Proposing a Mechanistic Understanding of Atmospheric CO2 During the late Pleist
· Greenhouse Gas (CO2, CH4) and Climate Evolution since 650 kyrs Deduced from Anta
Wednesday, September 28
· (In and) Out of Africa: Estimating the Carbon Exchange of a Continent
· Recent Shifts in Soil Dynamics on Growing Season Length, Productivity, and...
· Interannual Variability in the Carbon Exchange Using an Ecosystem-fire Model
· Photosynthesis and Respiration in Forests in Response to Environmental Changes
· Seasonal and Interannual Variability in Net Ecosystem CO2 Exchange in Japan
· Estimating Landscape-level Carbon Fluxes from Tower CO2 Mixing Ratio Measurement
· Monitoring Effects in Climate and Fire Regime on Net Ecosystem Production
· Radiative Forcing from a Boreal Forest Fire
· The Influence of Soil and Water Management on Carbon Erosion and Burial
· Spatial and Temporal Patterns of CO2, CH4, and N2O Fluxes in Ecosystems
· Modeling the History of Terrestrial Carbon Sources and Sinks
· The Age of Carbon Respired from Terrestrial Ecosystems
· Discussion Panel
· The Underpinnings of Land Use History
Tuesday, September 27
· Regional CO2 Fluxes for North America Estimated from NOAA/CMDL Observatories

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The 7th International CO2 Conference

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September 25th - 30th
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