Continuous measurement of soil carbon efflux with Forced Diffusion (FD) chambers in a tundra ecosystem of Alaska

Soil is a significant source of CO2 emission to the atmosphere, and this process is accelerating at high latitudes due to rapidly changing climates. To investigate the sensitivity of soil CO2 emissions to high temporal frequency variations in climate, we performed continuous monitoring of soil CO2 e...

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Bibliographic Details
Published in:The Science of the total environment 2016-10, Vol.566-567, p.175-184
Main Authors: Kim, Yongwon, Park, Sang-Jong, Lee, Bang-Yong, Risk, David
Format: Article
Language:English
Subjects:
Alaska
Annual soil carbon budget
Arctic region
carbon
carbon dioxide
data collection
ecosystems
Forced Diffusion (FD) chamber system
global warming
greenhouse gas emissions
growing season
latitude
lichens
monitoring
permafrost
Soil CO2 efflux
Sphagnum
Temperature
Thaw depth
tundra
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Summary:Soil is a significant source of CO2 emission to the atmosphere, and this process is accelerating at high latitudes due to rapidly changing climates. To investigate the sensitivity of soil CO2 emissions to high temporal frequency variations in climate, we performed continuous monitoring of soil CO2 efflux using Forced Diffusion (FD) chambers at half-hour intervals, across three representative Alaskan soil cover types with underlying permafrost. These sites were established during the growing season of 2015, on the Seward Peninsula of western Alaska. Our chamber system is conceptually similar to a dynamic chamber, though FD is more durable and water-resistant and consumes less power, lending itself to remote deployments. We first conducted methodological tests, testing different frequencies of measurement, and did not observe a significant difference between collecting data at 30-min and 10-min measurement intervals (averaged half-hourly) (p
ISSN:0048-9697
1879-1026
DOI:10.1016/j.scitotenv.2016.05.052