Seasonality of soil CO2 efflux in a temperate forest: Biophysical effects of snowpack and spring freeze–thaw cycles

Journal Article · Thu Aug 15 04:00:00 EDT 2013 · Agricultural and Forest Meteorology, 177:83– 92

DOI:https://doi.org/10.1016/j.agrformet.2013.04.008· OSTI ID:1090179

Wang, Chuankuan; Han, Yi; Chen, Jiquan; Wang, Xingchang; Zhang, Quanzhi; Bond-Lamberty, Benjamin

Changes in characteristics of snowfall and spring freeze–thaw-cycle (FTC) events under the warming climate make it critical to understand biophysical controls on soil CO2 efflux (RS) in seasonally snow-covered ecosystems. We conducted a snow removal experiment and took year-round continuous automated measurements of RS, soil temperature (T5) and soil volumetric water content at the 5 cm depth (W5) with a half-hour interval in a Chinese temperate forest in 2010–2011. Our objectives were to: (1) develop statistical models to describe the seasonality of RS in this forest; (2) quantify the contribution of seasonal RS to the annual budget; (3) examine biophysical effects of snowpack on RS; and (4) test the hypothesis that an FTC-induced enhancement of RS is jointly driven by biological and physical processes.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1090179
• Report Number(s): PNNL-SA-91383; KP1702010
• Journal Information: Agricultural and Forest Meteorology, 177:83– 92, Journal Name: Agricultural and Forest Meteorology, 177:83– 92
• Country of Publication: United States
• Language: English