Persistent and enhanced carbon sequestration capacity of alpine grasslands on Earth's Third Pole.

The lower-resolution NEE dataset over the period 2000–2018 revealed that the annual NEE of the alpine grassland region on the TP fluctuated between −57.08 and −32.47 g C m −2 year −1 , with an average of −43.50 ± 5.34 g C m −2 year −1 , and showed a nonsignificant trend of −0.38 g C m −2 year −1 ( P > 0.05).

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Between 1982 and 1999, mean annual NEE was −27.25 ± 5.81 g C m −2 year −1 (−39.90 ± 8.51 Tg C year −1 ) and had a significant trend of −0.62 g C m −2 year −1 (−0.91 Tg C year −1 ).

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In the alpine meadow region, the carbon sink intensity mostly showed a positive trend, while in some parts of the alpine steppe region, such as the Qiangtang Plateau, the absolute values of NEE showed a decreasing trend.

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