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- Title
Woody debris contribution to the carbon budget of selectively logged and maturing mid-latitude forests.
- Authors
Liu, Wendy H.; Bryant, David M.; Hutyra, Lucy R.; Saleska, Scott R.; Hammond-Pyle, Elizabeth; Curran, Daniel; Wofsy, Steven C.
- Abstract
Woody debris (WD) is an important component of forest C budgets, both as a C reservoir and source of CO2 to the atmosphere. We used an infrared gas analyzer and closed dynamic chamber to measure CO2 efflux from downed coarse WD (CWD; diameter≥7.5 cm) and fine WD (FWD; 7.5 cm>diameter≥2 cm) to assess respiration in a selectively logged forest and a maturing forest (control site) in the northeastern USA. We developed two linear regression models to predict WD respiration: one based on WD temperature, moisture, and size ( R 2=0.57), and the other on decay class and air temperature ( R 2=0.32). WD respiration (0.28±0.09 Mg C ha−1 year−1) contributed only ≈2% of total ecosystem respiration (12.3±0.7 Mg C ha−1 year−1, 1999–2003), but net C flux from CWD accounted for up to 30% of net ecosystem exchange in the maturing forest. C flux from CWD on the logged site increased modestly, from 0.61±0.29 Mg C ha−1 year−1 prior to logging to 0.77±0.23 Mg C ha−1 year−1 after logging, reflecting increased CWD stocks. FWD biomass and associated respiration flux were ≈7 times and ≈5 times greater, respectively, in the logged site than the control site. The net C flux associated with CWD, including inputs and respiratory outputs, was 0.35±0.19 Mg C ha−1 year−1 (net C sink) in the control site and −0.30±0.30 Mg C ha−1 year−1 (net C source) in the logged site. We infer that accumulation of WD may represent a small net C sink in maturing northern hardwood forests. Disturbance, such as selective logging, can enlarge the WD pool, increasing the net C flux from the WD pool to the atmosphere and potentially causing it to become a net C source.
- Subjects
COARSE woody debris; CARBON; FORESTS &; forestry; LOGGING; HARDWOODS; BIOTIC communities
- Publication
Oecologia, 2006, Vol 148, Issue 1, p108
- ISSN
0029-8549
- Publication type
Article
- DOI
10.1007/s00442-006-0356-9