التفاصيل البيبلوغرافية
| العنوان: |
Warming effects on methane fluxes differ between two alpine grasslands with contrasting soil water status. |
| المؤلفون: |
Li, Fei1,2 (AUTHOR), Yang, Guibiao1,2 (AUTHOR), Peng, Yunfeng1 (AUTHOR), Wang, Guanqin1,2 (AUTHOR), Qin, Shuqi1,2 (AUTHOR), Song, Yutong1,2 (AUTHOR), Fang, Kai1,2 (AUTHOR), Wang, Jun1,2 (AUTHOR), Yu, Jianchun1,2 (AUTHOR), Liu, Li1,2 (AUTHOR), Zhang, Dianye1,2 (AUTHOR), Chen, Kelong3 (AUTHOR), Zhou, Guoying4,5 (AUTHOR), Yang, Yuanhe1,2 (AUTHOR) yhyang@ibcas.ac.cn |
| المصدر: |
Agricultural & Forest Meteorology. Aug2020, Vol. 290, pN.PAG-N.PAG. 1p. |
| مصطلحات موضوعية: |
*SOIL moisture, *MOUNTAIN soils, *GRASSLAND soils, *CLIMATE feedbacks, *METHANE, *SOIL temperature, *GROWING season |
| مستخلص: |
• Warming enhanced steppe CH 4 uptake but didn't alter swamp meadow CH 4 emissions. • The distinct responses were linked with different warming effects on CH 4 drivers. • Enhanced CH 4 sink across the entire alpine grasslands with moderate warming. Soil moisture plays a vital role in regulating the direction and magnitude of methane (CH 4) fluxes. However, it remains unclear whether the responses of CH 4 fluxes to climate warming exhibit difference between dry and moist ecosystems. Based on standardized manipulative experiments (i.e. , consistent experimental design and measurement protocols), here we explored warming effects on growing season CH 4 fluxes in two alpine grasslands with contrasting water status on the Tibetan Plateau. We observed that experimental warming enhanced CH 4 uptake in the relatively arid alpine steppe, but had no significant effects on CH 4 emission in the moist swamp meadow. The distinct responses of CH 4 fluxes were associated with the different warming effects on biotic and abiotic factors related to CH 4 oxidation and production processes. Warming decreased soil water-filled pore space (WFPS) and increased the pmoA gene abundance and CH 4 oxidation potential in the alpine steppe, which together led to a significant increase in CH 4 uptake at this alpine steppe site. However, warming-induced enhancement in CH 4 oxidation potential might be counteracted by the simultaneously increased CH 4 production potential in the swamp meadow, which could then result in insignificant warming effects on CH 4 emission at this swamp meadow site. Based on a meta-analysis of warming effects on CH 4 fluxes across the entire Tibetan Plateau, we found that the entire alpine grasslands could absorb an extra 0.042 Tg CH 4 (1 Tg = 1012 g) per growing season if soil temperature increased by 1 °C. These findings demonstrate that warming effects on CH 4 fluxes differ between two alpine grasslands with contrasting moisture conditions and the entire alpine grasslands may not trigger a positive CH 4 feedback to climate system with moderate warming. Image, graphical abstract [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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