Satellite data indicate significant advancement in alpine spring phenology over decades of climate warming, but corresponding field evidence is scarce. It is also unknown whether this advancement results from an earlier shift of phenological events, or enhancement of plant growth under unchanged phenological pattern. By analyzing a 35-year dataset of seasonal biomass dynamics of a Tibetan alpine grassland, we show that climate change promoted both earlier phenology and faster growth, without changing annual biomass production. Biomass production increased in spring due to a warming-induced earlier onset of plant growth, but decreased in autumn due mainly to increased water stress. Plants grew faster but the fast-growing period shortened during the mid-growing season. These findings provide the first in situ evidence of long-term changes in growth patterns in alpine grassland plant communities, and suggest that earlier phenology and faster growth will jointly contribute to plant growth in a warming climate.

中文翻译：

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高山草原植物生长得更快，更快，但在35年的气候变化中生物量保持不变。

卫星数据表明，几十年来的气候变暖在高山春季物候方面取得了重大进展，但缺乏相应的现场证据。同样未知的是，这种进展是由于物候事件的较早转变，还是由于在不变的物候模式下植物生长的增强。通过分析藏高寒草原35年的季节性生物量动态数据集，我们发现气候变化既促进了更早的物候学又促进了更快的生长，而没有改变生物量的年产量。在春季，由于变暖导致的植物生长较早，生物量产量增加，而在秋季，主要由于水分胁迫增加，生物量产量减少。在生长中期，植物生长较快，但快速生长期缩短了。