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- W3092876826 abstract "Abstract Alpine wetlands play a sensitive function in global carbon cycle during the ongoing climate warming, yet the temporal patterns of carbon dynamics from in situ ground‐based long‐term observations remain unclear. Here, we analyzed the continuous net ecosystem CO 2 exchange (NEE) measured with the eddy covariance technique over an alpine peatland on the northeastern Qinghai‐Tibetan Plateau from 2007 to 2016. The wetland acted as a net CO 2 source with a positive NEE (120.4 ± 34.8 gC m −2 year −1 , Mean ± SD), with the mean annual gross primary productivity (GPP) of 500.3 ± 59.4 gC m −2 year −1 and annual ecosystem respiration (RES) of 620.7 ± 74.2 gC m −2 year −1 . At the seasonal scale, the classification and regression trees (CART) analysis showed that aggregated growing season degree days (GDDs) were the predominant determinant on variations in monthly NEE and monthly GPP. Variations in monthly RES were determined by soil temperature (Ts). Furthermore, nongrowing season Ts had a significant positive correlation with the following year annual GPP ( p < 0.05). Nongrowing season RES only accounted for about 25% of annual RES but had significant correlation with annual RES and annual NEE ( p < 0.05). The further partial correlation analysis showed that nongrowing season air temperature (Ta, p = 0.05), rather than precipitation (PPT, p = 0.25) was a predominant determinant on variations in annual NEE. Our results highlighted the importance in carbon dynamics of climate fluctuations and CO 2 emission from the nongrowing season in alpine wetlands. We speculated that the vast peadlands would positively feedback to climate change on the Tibetan plateau where the nongrowing season warming was significant." @default.
- W3092876826 created "2020-10-22" @default.
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- W3092876826 date "2020-11-01" @default.
- W3092876826 modified "2023-10-14" @default.
- W3092876826 title "Seasonal and Interannual Variations of CO<sub>2</sub> Fluxes Over 10 Years in an Alpine Wetland on the Qinghai‐Tibetan Plateau" @default.
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- W3092876826 doi "https://doi.org/10.1029/2020jg006011" @default.
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