title: Effects of Warming on CO2 Fluxes in an Alpine Meadow Ecosystem on the Central Qinghai-Tibetan Plateau.
abstract: To analyze CO2 fluxes under conditions of climate change in an alpine meadow on the central Qinghai-Tibetan Plateau, we simulated the effect of warming using open top chambers (OTCs) from 2012 to 2014. The OTCs increased soil temperature by 1.62°C (P < 0.05), but decreased soil moisture (1.38%, P < 0.05) during the experiments. The response of ecosystem CO2 fluxes to warming was variable, and dependent on the year. Under conditions of warming, mean gross ecosystem productivity (GEP) during the growing season increased significantly in 2012 and 2014 (P < 0.05); however, ecosystem respiration (ER) increased substantially only in 2012 (P < 0.05). The net ecosystem CO2 exchange (NEE) increased marginally in 2012 (P = 0.056), did not change in 2013(P > 0.05), and increased significantly in 2014 (P = 0.034) under conditions of warming. The GEP was more sensitive to climate variations than was the ER, resulting in a large increase in net carbon uptake under warming in the alpine meadow. Under warming, the 3-year averages of GEP, ER, and NEE increased by 19.6%, 15.1%, and 21.1%, respectively. The seasonal dynamic patterns of GEP and NEE, but not ER, were significantly impacted by warming. Aboveground biomass, particularly the graminoid biomass increased significantly under conditions of warming. Soil moisture, soil temperature, and aboveground biomass were the main factors that affected the variation of the ecosystem CO2 fluxes. The effect of warming on inter- and intra-annual patterns of ecosystem CO2 fluxes and the mechanism of different sensitivities in GEP and ER to warming, require further researched.
authors.affiliation: Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing, China; Key Laboratory for Agro-Environment & Climate Change, Ministry of Agriculture, Beijing, China.
authors.forename: Hasbagan
authors.initials: H
authors.lastname: Ganjurjav
authors.affiliation: Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing, China; Key Laboratory for Agro-Environment & Climate Change, Ministry of Agriculture, Beijing, China.
authors.forename: Qingzhu
authors.initials: Q
authors.lastname: Gao
authors.affiliation: Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing, China; Key Laboratory for Agro-Environment & Climate Change, Ministry of Agriculture, Beijing, China.
authors.forename: Weina
authors.initials: W
authors.lastname: Zhang
authors.affiliation: Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing, China; Key Laboratory for Agro-Environment & Climate Change, Ministry of Agriculture, Beijing, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Liang
authors.affiliation: Clinic Pharmacy of Qinghai Hospital of Traditional Chinese Medicine, Qinghai Province, Xining, China.
authors.forename: Yawei
authors.initials: Y
authors.lastname: Li
authors.affiliation: Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing, China; Key Laboratory for Agro-Environment & Climate Change, Ministry of Agriculture, Beijing, China.
authors.forename: Xujuan
authors.initials: X
authors.lastname: Cao
authors.affiliation: Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing, China; Key Laboratory for Agro-Environment & Climate Change, Ministry of Agriculture, Beijing, China.
authors.forename: Yunfan
authors.initials: Y
authors.lastname: Wan
authors.affiliation: Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing, China; Key Laboratory for Agro-Environment & Climate Change, Ministry of Agriculture, Beijing, China.
authors.forename: Yue
authors.initials: Y
authors.lastname: Li
authors.affiliation: Nagqu Agriculture and Animal Husbandry Bureau, Tibet Autonomous Region, Nagqu, China.
authors.forename: Luobu
authors.initials: L
authors.lastname: Danjiu
mesh_terms: D002245:Carbon Dioxide / Q000378:metabolism*; D058572:Carbon Footprint; D057232:Global Warming; D065948:Grassland; D018609:Tibet
chemical_list: D002245:Carbon Dioxide