Home About Browse Search
Svenska


CO2 and CH4 exchanges between moist moss tundra and atmosphere on Kapp Linne, Svalbard

Lindroth, Anders and Pirk, Norbert and Jonsdottir, Ingibjorg S. and Stiegler, Christian and Klemedtsson, Leif and Nilsson, Mats (2022). CO2 and CH4 exchanges between moist moss tundra and atmosphere on Kapp Linne, Svalbard. Biogeosciences. 19 :16 , 3921-3934
[Research article]

[img] PDF
5MB

Abstract

We measured CO2 and CH4 fluxes using chambers and eddy covariance (only CO2) from a moist moss tundra in Svalbard. The average net ecosystem exchange (NEE) during the summer (9 June-31 August) was negative (sink), with -0.139 +/- 0.032 mu mol m(-2) s(-1) corresponding to -11.8 g C m(-2) for the whole summer. The cumulated NEE over the whole growing season (day no. 160 to 284) was -2.5 g C m(-2). The CH4 flux during the summer period showed a large spatial and temporal variability. The mean value of all 214 samples was 0.000511 +/- 0.000315 mu mol m(-2) s(-1), which corresponds to a growing season estimate of 0.04 to 0.16 g CH4 m(-2). Thus, we find that this moss tundra ecosystem is closely in balance with the atmosphere during the growing season when regarding exchanges of CO2 and CH4. The sink of CO2 and the source of CH4 are small in comparison with other tundra ecosystems in the high Arctic.Air temperature, soil moisture and the greenness index contributed significantly to explaining the variation in ecosystem respiration (R-eco), while active layer depth, soil moisture and the greenness index were the variables that best explained CH4 emissions. An estimate of temperature sensitivity of Reco and gross primary productivity (GPP) showed that the sensitivity is slightly higher for GPP than for R-eco in the interval 0-4.5 degrees C; thereafter, the difference is small up to about 6 degrees C and then begins to rise rapidly for R-eco. The consequence of this, for a small increase in air temperature of 1 degrees (all other variables assumed unchanged), was that the respiration increased more than photosynthesis turning the small sink into a small source (4.5 g C m(-2)) during the growing season. Thus, we cannot rule out that the reason why the moss tundra is close to balance today is an effect of the warming that has already taken place in Svalbard.

Authors/Creators:Lindroth, Anders and Pirk, Norbert and Jonsdottir, Ingibjorg S. and Stiegler, Christian and Klemedtsson, Leif and Nilsson, Mats
Title:CO2 and CH4 exchanges between moist moss tundra and atmosphere on Kapp Linne, Svalbard
Series Name/Journal:Biogeosciences
Year of publishing :2022
Volume:19
Number:16
Page range:3921-3934
Number of Pages:14
Publisher:COPERNICUS GESELLSCHAFT MBH
ISSN:1726-4170
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Physical Geography
URN:NBN:urn:nbn:se:slu:epsilon-p-118933
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-118933
Additional ID:
Type of IDID
DOI10.5194/bg-19-3921-2022
Web of Science (WoS)000847360500001
ID Code:28850
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Ecology and Management
Deposited By: SLUpub Connector
Deposited On:15 Sep 2022 09:32
Metadata Last Modified:15 Sep 2022 09:41

Repository Staff Only: item control page

Downloads

Downloads per year (since September 2012)

View more statistics

Downloads
Hits