Long-term changes in the daytime growing season carbon dioxide exchange following increased temperature and snow cover in arctic tundra
Research output: Contribution to journal › Journal article › Research › peer-review
Standard
Long-term changes in the daytime growing season carbon dioxide exchange following increased temperature and snow cover in arctic tundra. / Hermesdorf, Lena; Liu, Yijing; Michelsen, Anders; Westergaard-Nielsen, Andreas; Mortensen, Louise Hindborg; Jepsen, Malte Skov; Sigsgaard, Charlotte; Elberling, Bo.
In: Global Change Biology, Vol. 30, No. 1, e17087, 2024.Research output: Contribution to journal › Journal article › Research › peer-review
Harvard
APA
Vancouver
Author
Bibtex
}
RIS
TY - JOUR
T1 - Long-term changes in the daytime growing season carbon dioxide exchange following increased temperature and snow cover in arctic tundra
AU - Hermesdorf, Lena
AU - Liu, Yijing
AU - Michelsen, Anders
AU - Westergaard-Nielsen, Andreas
AU - Mortensen, Louise Hindborg
AU - Jepsen, Malte Skov
AU - Sigsgaard, Charlotte
AU - Elberling, Bo
N1 - CENPERM[2024] Publisher Copyright: © 2023 John Wiley & Sons Ltd.
PY - 2024
Y1 - 2024
N2 - Increasing temperatures and winter precipitation can influence the carbon (C) exchange rates in arctic ecosystems. Feedbacks can be both positive and negative, but the net effects are unclear and expected to vary strongly across the Arctic. There is a lack of understanding of the combined effects of increased summer warming and winter precipitation on the C balance in these ecosystems. Here we assess the short-term (1–3 years) and long-term (5–8 years) effects of increased snow depth (snow fences) (on average + 70 cm) and warming (open top chambers; 1–3°C increase) and the combination in a factorial design on all key components of the daytime carbon dioxide (CO2) fluxes in a wide-spread heath tundra ecosystem in West Greenland. The warming treatment increased ecosystem respiration (ER) on a short- and long-term basis, while gross ecosystem photosynthesis (GEP) was only increased in the long term. Despite the difference in the timing of responses of ER and GEP to the warming treatment, the net ecosystem exchange (NEE) of CO2 was unaffected in the short term and in the long term. Although the structural equation model (SEM) indicates a direct relationship between seasonal accumulated snow depth and ER and GEP, there were no significant effects of the snow addition treatment on ER or GEP measured over the summer period. The combination of warming and snow addition turned the plots into net daytime CO2 sources during the growing season. Interestingly, despite no significant changes in air temperature during the snow-free time during the experiment, control plots as well as warming plots revealed significantly higher ER and GEP in the long term compared to the short term. This was in line with the satellite-derived time-integrated normalized difference vegetation index of the study area, suggesting that more factors than air temperature are drivers for changes in arctic tundra ecosystems.
AB - Increasing temperatures and winter precipitation can influence the carbon (C) exchange rates in arctic ecosystems. Feedbacks can be both positive and negative, but the net effects are unclear and expected to vary strongly across the Arctic. There is a lack of understanding of the combined effects of increased summer warming and winter precipitation on the C balance in these ecosystems. Here we assess the short-term (1–3 years) and long-term (5–8 years) effects of increased snow depth (snow fences) (on average + 70 cm) and warming (open top chambers; 1–3°C increase) and the combination in a factorial design on all key components of the daytime carbon dioxide (CO2) fluxes in a wide-spread heath tundra ecosystem in West Greenland. The warming treatment increased ecosystem respiration (ER) on a short- and long-term basis, while gross ecosystem photosynthesis (GEP) was only increased in the long term. Despite the difference in the timing of responses of ER and GEP to the warming treatment, the net ecosystem exchange (NEE) of CO2 was unaffected in the short term and in the long term. Although the structural equation model (SEM) indicates a direct relationship between seasonal accumulated snow depth and ER and GEP, there were no significant effects of the snow addition treatment on ER or GEP measured over the summer period. The combination of warming and snow addition turned the plots into net daytime CO2 sources during the growing season. Interestingly, despite no significant changes in air temperature during the snow-free time during the experiment, control plots as well as warming plots revealed significantly higher ER and GEP in the long term compared to the short term. This was in line with the satellite-derived time-integrated normalized difference vegetation index of the study area, suggesting that more factors than air temperature are drivers for changes in arctic tundra ecosystems.
KW - climate change
KW - CO
KW - ecosystem respiration
KW - Greenland
KW - gross ecosystem photosynthesis
KW - NDVI
KW - net ecosystem exchange
KW - snow
KW - warming
U2 - 10.1111/gcb.17087
DO - 10.1111/gcb.17087
M3 - Journal article
C2 - 38273494
AN - SCOPUS:85180695811
VL - 30
JO - Global Change Biology
JF - Global Change Biology
SN - 1354-1013
IS - 1
M1 - e17087
ER -
ID: 382439615