Journal
APPLIED SOIL ECOLOGY
Volume 167, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsoil.2021.104061
Keywords
Climate change; Soil water content; Soil temperature; Methane uptake; Non-growing season; Alpine meadow
Categories
Funding
- National Natural Science Foundation of China [31630009, 31971467]
- Second Tibetan Plateau Scientific Expedition and Research (STEP) program [2019QZKK0302]
- Qing-hai Innovation Platform Construction Project [2017-ZJ-Y20]
Ask authors/readers for more resources
Alpine meadows act as significant CH4 sinks, with warming increasing CH4 uptake significantly and drought enhancing this effect by decreasing soil water content. However, wetness weakens the warming effect on CH4 uptake. The study also found that warming stimulates CH4 uptake not only by increasing CH4 oxidation but also by changing the methanotroph community compositional structure.
Alpine meadows are significant CH4 sink. However, the response of soil CH4 uptake to future climate change in the alpine meadows remains poorly understood. We carried out an alpine meadow field experiments to determine how warming and altered precipitation (drought and wetness) affect CH(4 )uptake, as well as its underlying mechanisms. Our results showed that this mesic alpine meadow was a CH4 sink under all treatments (ranging from -311.4 to -487.1 mg m- 2 CH4). Warming significantly increased CH4 uptake by an average of 18.14% of the annual cumulative CH4 uptake and by 48.68% of the non-growing season cumulative CH4 uptake. Drought enhanced the positive warming effect on CH4 uptake by decreasing soil water content, but wetness weakened this effect. Moreover, using high-throughput sequencing and GeoChip approaches, we found that warming stimulated CH4 uptake not only by increasing CH4 oxidation but also by decreasing CH4 production through changing the methanotroph community compositional structure. Further analysis revealed that the dynamics of daily CH4 uptake were mainly regulated by soil water content during the growing season, whereas daily CH4 uptake was strongly correlated with soil temperature during the non-growing season. Warming and altered precipitation influence soil CH4 uptake in different ways during the growing and non-growing seasons. Based on our results, we predict that Tibetan Plateau mesic alpine meadows will remain a net sink of CH(4 )under future climate warming and drought scenarios, but soil CH4 uptake will decrease if precipitation increases in future.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available