Premium
Role of coarse woody debris in the carbon cycle of Takayama forest, central Japan
Author(s) -
Ohtsuka Toshiyuki,
Shizu Yoko,
Hirota Mitsuru,
Yashiro Yuichiro,
Shugang Jia,
Iimura Yasuo,
Koizumi Hiroshi
Publication year - 2014
Publication title -
ecological research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.628
H-Index - 68
eISSN - 1440-1703
pISSN - 0912-3814
DOI - 10.1007/s11284-013-1102-5
Subject(s) - coarse woody debris , environmental science , temperate rainforest , carbon cycle , carbon sink , forestry , snag , forest ecology , ecology , atmospheric sciences , ecosystem , biology , geography , habitat , geology
Coarse woody debris (CWD) is an important component of the forest carbon cycle, acting as a carbon pool and a source of CO 2 in temperate forest ecosystems. We used a soda‐lime closed‐chamber method to measure CO 2 efflux from downed CWD (diameter ≥5 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.