Understanding the Mechanisms Underlying Heterotrophic CO2 and CH4 Fluxes in a Peatland with Deep Soil Warming and Atmospheric CO2 Enrichment

Bridgham, Scott D.¹  Keller, Jason K.²  Zhuang, Qianlai³ 

[1]Univ. of Oregon, Eugene, OR (United States). Inst. of Ecology and Evolution

[2]Chapman Univ., Orange, CA (United States). Schmid College of Science and Technology

[3]Purdue Univ., West Lafayette, IN (United States). Dept. of Earth and Atmospheric Sciences and Agronomy

关键词: climate change;    peatlands;    methane;    anaerobic carbon cycling;   

DOI  :  10.2172/1324457
RP-ID  :  UO-DOE--08092
PID  :  OSTI ID: 1324457

美国|英语

来源: SciTech Connect

【 摘 要 】

This project was funded from June 15, 2012 through June 15, 2015, with a no-cost extension until Sept. 15, 2016. Our project focused on a whole-ecosystem warming and enhanced atmospheric CO₂ experiment in the S1 Bog in Marcell Experimental Forest in northern Minnesota, USA called ???Spruce and Peatland Responses Under Climatic and Environmental Change??? (SPRUCE; http://mnspruce.ornl.gov). Construction of substantial infrastructure required for these treatments was beyond our control and led to a staggered initiation of experimental treatments at this site. Deep peat heating (DPH) was instituted in June 2014, whole-ecosystem warming began in August 2015, and the CO₂ enhancement began in June 2016. Prior to the initiation of the experimental treatments, we completed a large amount of research to better understand factors controlling anaerobic carbon (C) cycling, and particularly methane (CH₄) dynamics, in northern peatlands in an effort to put the SPRUCE project in a broader context. We additionally focused extensively on the DPH treatment, which provided a unique opportunity to isolate warming effects on the vast reservoir of permanently anaerobic C stored in peatlands below the water table.