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Article

Effects of Gradient Warming on Carbon and Water Fluxes in Zoige Plateau Peatland

1
Wetland Research Center, Institute of Ecological Conservation and Restoration, Chinese Academy of Forestry, Beijing 100091, China
2
Beijing Key Laboratory of Wetland Services and Restoration, Beijing 100091, China
3
Sichuan Zoige Wetland Ecosystem Research Station, Tibetan Autonomous Prefecture of Aba 624500, China
4
College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
5
College of Grassland Agriculture, Northwest A&F University, Yangling 712100, China
6
State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
7
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
*
Authors to whom correspondence should be addressed.
Water 2025, 17(2), 241; https://doi.org/10.3390/w17020241
Submission received: 4 December 2024 / Revised: 10 January 2025 / Accepted: 15 January 2025 / Published: 16 January 2025

Abstract

Water use efficiency (WUE) plays a pivotal role in connecting the carbon and water cycles and represents the amount of water used by plants or ecosystems to achieve carbon sequestration. The response of WUE to climate warming and its underlying mechanisms remain unclear. Here, we examined the effects of varying levels of warming on carbon fluxes, water fluxes, and WUE in an alpine peatland, with Blysmus sinocompressus and Carex secbrirostris as dominant species. Open-top chambers were utilized to simulate two levels of warming: low-level warming (TL) and high-level warming (TH). The carbon dioxide and water fluxes were monitored over a growing season (June to September). Gradient warming significantly decreased both gross primary productivity (GPP) and net ecosystem carbon exchange (NEE); GPP was 10.05% and 13.31% lower and NEE was 21.00% and 30.00% lower in the TL and TH treatments, respectively, than in the control. Warming had no significant effect on soil evaporation, and plant transpiration and evapotranspiration were 36.98% and 23.71% higher in the TL treatment than in the control, respectively; this led to decreases of 31.38% and 28.17% in canopy water use efficiency (WUEc) and ecosystem water use efficiency (WUEe), respectively. Plant transpiration was the main factor affecting both WUEe and WUEc in response to warming. The findings underscore the essential function of water fluxes in regulating WUE and enhance our understanding of carbon–water coupling mechanisms under climate change.
Keywords: climate change; carbon–water coupling; gross primary productivity; plant transpiration; alpine peatland climate change; carbon–water coupling; gross primary productivity; plant transpiration; alpine peatland

Share and Cite

MDPI and ACS Style

Yu, X.; Hao, Y.; Yan, Z.; Li, Y.; Yang, A.; Niu, Y.; Liu, J.; Kang, E.; Zhang, K.; Yan, L.; et al. Effects of Gradient Warming on Carbon and Water Fluxes in Zoige Plateau Peatland. Water 2025, 17, 241. https://doi.org/10.3390/w17020241

AMA Style

Yu X, Hao Y, Yan Z, Li Y, Yang A, Niu Y, Liu J, Kang E, Zhang K, Yan L, et al. Effects of Gradient Warming on Carbon and Water Fluxes in Zoige Plateau Peatland. Water. 2025; 17(2):241. https://doi.org/10.3390/w17020241

Chicago/Turabian Style

Yu, Xiaoshun, Yanbin Hao, Zhongqing Yan, Yong Li, Ao Yang, Yuechuan Niu, Jinming Liu, Enze Kang, Kerou Zhang, Liang Yan, and et al. 2025. "Effects of Gradient Warming on Carbon and Water Fluxes in Zoige Plateau Peatland" Water 17, no. 2: 241. https://doi.org/10.3390/w17020241

APA Style

Yu, X., Hao, Y., Yan, Z., Li, Y., Yang, A., Niu, Y., Liu, J., Kang, E., Zhang, K., Yan, L., Zhuang, W., Zhang, X., & Kang, X. (2025). Effects of Gradient Warming on Carbon and Water Fluxes in Zoige Plateau Peatland. Water, 17(2), 241. https://doi.org/10.3390/w17020241

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