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Effects of Warming on CO2 Fluxes in an Alpine Meadow Ecosystem on the Central Qinghai-Tibetan Plateau.

Ganjurjav H, Gao Q, Zhang W, Liang Y, Li Y, Cao X, Wan Y, Li Y, Danjiu L - PLoS ONE (2015)

Bottom Line: 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.The seasonal dynamic patterns of GEP and NEE, but not ER, were significantly impacted by warming.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.

View Article: PubMed Central - PubMed

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.

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.

No MeSH data available.


Related in: MedlinePlus

Total aboveground biomass (a), graminoid biomass (b), forb biomass (c), and ratio of graminoid and forb (d) in alpine meadow during 2012–2014 growing seasons.C: Control, W: Warming.
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pone.0132044.g003: Total aboveground biomass (a), graminoid biomass (b), forb biomass (c), and ratio of graminoid and forb (d) in alpine meadow during 2012–2014 growing seasons.C: Control, W: Warming.

Mentions: Warming (in the OTCs) significantly increased the aboveground biomass (Fig 3) by 70.7%, 28.1%, and 73.9% in 2012, 2013, and 2014, respectively (Fig 3a, P<0.05), and increased the graminoid biomass by 90.0%, 45.4%, and 117.5%, respectively (Fig 3b, P<0.05); the forb biomass was not significantly affected by warming (Fig 3c). Therefore, the biomass ratio of graminoids and forbs significantly increased in the warming plots as compared to the control plot (Fig 3d).


Effects of Warming on CO2 Fluxes in an Alpine Meadow Ecosystem on the Central Qinghai-Tibetan Plateau.

Ganjurjav H, Gao Q, Zhang W, Liang Y, Li Y, Cao X, Wan Y, Li Y, Danjiu L - PLoS ONE (2015)

Total aboveground biomass (a), graminoid biomass (b), forb biomass (c), and ratio of graminoid and forb (d) in alpine meadow during 2012–2014 growing seasons.C: Control, W: Warming.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4492951&req=5

pone.0132044.g003: Total aboveground biomass (a), graminoid biomass (b), forb biomass (c), and ratio of graminoid and forb (d) in alpine meadow during 2012–2014 growing seasons.C: Control, W: Warming.
Mentions: Warming (in the OTCs) significantly increased the aboveground biomass (Fig 3) by 70.7%, 28.1%, and 73.9% in 2012, 2013, and 2014, respectively (Fig 3a, P<0.05), and increased the graminoid biomass by 90.0%, 45.4%, and 117.5%, respectively (Fig 3b, P<0.05); the forb biomass was not significantly affected by warming (Fig 3c). Therefore, the biomass ratio of graminoids and forbs significantly increased in the warming plots as compared to the control plot (Fig 3d).

Bottom Line: 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.The seasonal dynamic patterns of GEP and NEE, but not ER, were significantly impacted by warming.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.

View Article: PubMed Central - PubMed

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.

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.

No MeSH data available.


Related in: MedlinePlus