Journal
ECOLOGICAL RESEARCH
Volume 29, Issue 1, Pages 91-101Publisher
WILEY
DOI: 10.1007/s11284-013-1102-5
Keywords
AsiaFlux network; CO2 efflux; CWD; Net ecosystem production; Soda-lime
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Funding
- Japan Society for the Promotion of Science, Japan
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Coarse woody debris (CWD) is an important component of the forest carbon cycle, acting as a carbon pool and a source of CO2 in temperate forest ecosystems. We used a soda-lime closed-chamber method to measure CO2 efflux from downed CWD (diameter a parts per thousand yen5 cm) and to examine CWD respiration (R (CWD)) under field conditions over 1 year in a temperate secondary pioneer forest in Takayama forest. We also investigated tree mortality (input to the CWD pool) from the data obtained from the annual tree census, which commenced in 2000. We developed an exponential function of temperature to predict R (CWD) in each decay class (R (2) = 0.81-0.97). The sensitivity of R (CWD) to changing temperature, expressed as Q (10), ranged from 2.12 to 2.92 and was relatively high in decay class III. Annual C flux from CWD (F (CWD)) was extrapolated using continuous air temperature measurements and CWD necromass pools in the three decay classes. F (CWD) was 3.0 (class I), 17.8 (class II), and 13.7 g C m(-2) year(-1) (class III) and totaled 34 g C m(-2) year(-1) in 2009. Annual input to CWD averaged 77 g C m(-2) year(-1) from 2000 to 2009. The budget of the CWD pool in the Takayama forest, including tree mortality inputs and respiratory outputs, was 0.43 Mg C ha(-1) year(-1) (net C sink) owing to high tree mortality in the mature pioneer forest. The potential CWD sink is important for the carbon cycle in temperate successional forests.
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