Details

Autor(en) / Beteiligte

• Chen, Ning
• Zhang, Yangjian
• Zhu, Juntao
• Zu, Jiaxing
• Huang, Ke
• Li, Junxiang
• Liu, Yaojie
• Cong, Nan
• Tang, Ze
• Wang, Li
• Zhu, Yixuan

Titel

Temperature‐mediated responses of carbon fluxes to precipitation variabilities in an alpine meadow ecosystem on the Tibetan Plateau

Ist Teil von

• Ecology and evolution, 2019-08, Vol.9 (16), p.9005-9017

Ort / Verlag

England: John Wiley & Sons, Inc

Erscheinungsjahr

2019

Quelle

Wiley Online Library

Beschreibungen/Notizen

• Effects of climate warming and changing precipitation on ecosystem carbon fluxes have been intensively studied. However, how they co‐regulate carbon fluxes is still elusive for some understudied ecosystems. To fill the gap, we examined net ecosystem productivity (NEP), gross ecosystem productivity (GEP,) and ecosystem respiration (ER) responses to multilevel of temperature increments (control, warming 1, warming 2, warming 3, warming 4) in three contrasting hydrological growing seasons in a typical semiarid alpine meadow. We found that carbon fluxes responded to precipitation variations more strongly in low‐level warming treatments than in high‐level ones. The distinct responses were attributable to different soil water conditions and community composition under low‐level and high‐level warming during the three growing seasons. In addition, carbon fluxes were much more sensitive to decreased than to increased precipitation in low‐level warming treatments, but not in high‐level ones. At a regional scale, this negative asymmetry was further corroborated. This study reveals that future precipitation changes, particularly decreased precipitation would induce significant change in carbon fluxes, and the effect magnitude is regulated by climate warming size. Warming regulates the effect of precipitation (PPT) variability on carbon (C) fluxes. C fluxes respond to PPT more strongly in low‐level warming than high‐level warming. C fluxes were more sensitive to decreased than to increased PPT in low‐level warming.