Regional emissions of soil greenhouse gases across Tibetan alpine grasslands
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Regional emissions of soil greenhouse gases across Tibetan alpine grasslands. / Wang, Peiyan; Wang, Jinsong; Elberling, Bo; Ambus, Per; Li, Yang; Pan, Junxiao; Zhang, Ruiyang; Guo, Hui; Niu, Shuli.
In: Geoderma, Vol. 443, 116843, 2024.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Regional emissions of soil greenhouse gases across Tibetan alpine grasslands
AU - Wang, Peiyan
AU - Wang, Jinsong
AU - Elberling, Bo
AU - Ambus, Per
AU - Li, Yang
AU - Pan, Junxiao
AU - Zhang, Ruiyang
AU - Guo, Hui
AU - Niu, Shuli
N1 - CENPERMOA[2024] Publisher Copyright: © 2024 The Author(s)
PY - 2024
Y1 - 2024
N2 - Soil greenhouse gas (GHG) emissions play an important role in regional climate feedback on the Qinghai-Tibetan Plateau (QTP). Previous studies have focused on soil GHGs based on observations within a limited space on the QTP, however, the regional GHG emissions remain unclear. Analyzing soil samples from 25 sites along a 2,700 km transect across QTP, we showed significantly higher soil CO2 and N2O emission rates in alpine meadows than other upland grassland types, but similar soil CH4 uptake rates across all grassland types. The spatial variations of total soil GHG balance were dominated by CO2 emission. We found that CO2 emission was primarily constrained by high soil pH, low soil moisture and nutrient availability, and fungal abundance, N2O emission was inhibited by high soil pH, while CH4 uptake was dominated by methanotrophic abundance. Furthermore, we estimated a current regional total soil GHG balance of 144.4 Tg CO2-eq yr−1 for surface soil across Tibetan alpine grasslands, which increased by 17.6%, 24.8%, and 38.9% under warming scenarios of 1.5℃, 2℃ and 3℃, respectively. Our results provide a baseline for regional soil GHG emissions responding to climate warming on the QTP.
AB - Soil greenhouse gas (GHG) emissions play an important role in regional climate feedback on the Qinghai-Tibetan Plateau (QTP). Previous studies have focused on soil GHGs based on observations within a limited space on the QTP, however, the regional GHG emissions remain unclear. Analyzing soil samples from 25 sites along a 2,700 km transect across QTP, we showed significantly higher soil CO2 and N2O emission rates in alpine meadows than other upland grassland types, but similar soil CH4 uptake rates across all grassland types. The spatial variations of total soil GHG balance were dominated by CO2 emission. We found that CO2 emission was primarily constrained by high soil pH, low soil moisture and nutrient availability, and fungal abundance, N2O emission was inhibited by high soil pH, while CH4 uptake was dominated by methanotrophic abundance. Furthermore, we estimated a current regional total soil GHG balance of 144.4 Tg CO2-eq yr−1 for surface soil across Tibetan alpine grasslands, which increased by 17.6%, 24.8%, and 38.9% under warming scenarios of 1.5℃, 2℃ and 3℃, respectively. Our results provide a baseline for regional soil GHG emissions responding to climate warming on the QTP.
KW - Alpine grasslands
KW - Climate feedback
KW - Controlling factors
KW - Regional estimation
KW - Soil greenhouse gas emissions
KW - Temperature sensitivity
U2 - 10.1016/j.geoderma.2024.116843
DO - 10.1016/j.geoderma.2024.116843
M3 - Journal article
AN - SCOPUS:85186516634
VL - 443
JO - Geoderma
JF - Geoderma
SN - 0016-7061
M1 - 116843
ER -
ID: 389416260