Persistent and enhanced carbon sequestration capacity of alpine grasslands on Earth's Third Pole.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 37196073.
- Also identified by DOI 10.1126/sciadv.ade6875 and PMC identifier 10191437.
- Licence recorded as CC BY-NC.
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Abstract
The carbon sequestration capacity of alpine grasslands, composed of alpine meadows and steppes, in the Tibetan Plateau has an essential role in regulating the regional carbon cycle. However, inadequate understanding of its spatiotemporal dynamics and regulatory mechanisms restricts our ability to determine potential climate change impacts. We assessed the spatial and temporal patterns and mechanisms of the net ecosystem exchange (NEE) of carbon dioxide in the Tibetan Plateau. The carbon sequestration of the alpine grasslands ranged from 26.39 to 79.19 Tg C year<sup>-1</sup> and had an increasing rate of 1.14 Tg C year<sup>-1</sup> between 1982 and 2018. While alpine meadows were relatively strong carbon sinks, the semiarid and arid alpine steppes were nearly carbon neutral. Alpine meadow areas experienced strong increases in carbon sequestration mainly because of increasing temperatures, while alpine steppe areas had weak increases mainly due to increasing precipitation. Carbon sequestration capacity of alpine grasslands on the plateau has undergone persistent enhancement under a warmer and wetter climate.