State Key Laboratory of Tibetan Plateau Earth System, Resources and Environment (TPESRE), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China.
Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT 59717, USA.
Sci Adv. 2024 Jun 7;10(23):eadn2487. doi: 10.1126/sciadv.adn2487.
Extended growing season lengths under climatic warming suggest increased time for plant growth. However, research has focused on climatic impacts to the timing or duration of distinct phenological events. Comparatively little is known about impacts to the relative time allocation to distinct phenological events, for example, the proportion of time dedicated to leaf growth versus senescence. We use multiple satellite and ground-based observations to show that, despite recent climate change during 2001 to 2020, the ratio of time allocated to vegetation green-up over senescence has remained stable [1.27 (± 0.92)] across more than 83% of northern ecosystems. This stability is independent of changes in growing season lengths and is caused by widespread positive relationships among vegetation phenological events; longer vegetation green-up results in longer vegetation senescence. These empirical observations were also partly reproduced by 13 dynamic global vegetation models. Our work demonstrates an intrinsic biotic control to vegetation phenology that could explain the timing of vegetation senescence under climate change.
气候变暖导致生长季延长，为植物生长提供了更多的时间。然而，研究主要集中在气候对不同物候事件的时间或持续时间的影响上。相对而言，人们对不同物候事件的相对时间分配的影响知之甚少，例如，用于叶片生长和衰老的时间比例。我们利用多颗卫星和地面观测数据表明，尽管 2001 年至 2020 年期间最近发生了气候变化，但在超过 83%的北方生态系统中，用于植被返青和衰老的时间比例仍保持稳定[1.27（±0.92)]。这种稳定性与生长季长度的变化无关，是由植被物候事件之间广泛存在的正相关关系造成的；植被返青时间延长导致植被衰老时间延长。13 个动态全球植被模型部分再现了这些经验观测结果。我们的工作证明了植被物候学的内在生物控制作用，这可以解释气候变化下植被衰老的时间。
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