春季物候而非气候主导北半球生长季峰值的变化趋势。
Spring phenology rather than climate dominates the trends in peak of growing season in the Northern Hemisphere.
机构信息
College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, China.
Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China.
出版信息
Glob Chang Biol. 2023 Aug;29(16):4543-4555. doi: 10.1111/gcb.16758. Epub 2023 May 17.
Shifts in plant phenology regulate ecosystem structure and function, which feeds back to the climate system. However, drivers for the peak of growing season (POS) in seasonal dynamics of terrestrial ecosystems remain unclear. Here, spatial-temporal patterns of POS dynamics were analyzed by solar-induced chlorophyll fluorescence (SIF) and vegetation index in the Northern Hemisphere over the past two decades from 2001 to 2020. Overall, a slow advanced POS was observed in the Northern Hemisphere, while a delayed POS distributed mainly in northeastern North America. Trends of POS were driven by the start of growing season (SOS) rather than pre-POS climate both at hemisphere and biome scale. The effect of SOS on the trends in POS was the strongest in shrublands while the weakest in evergreen broad-leaved forest. These findings highlight the crucial role of biological rhythms rather than climatic factors in exploring seasonal carbon dynamics and global carbon balance.
物候期的转变调节着生态系统的结构和功能，而这些又会反作用于气候系统。然而，陆地生态系统季节性动态中生长季始期（POS）的驱动因素仍不清楚。本研究利用 2001 年至 2020 年间北半球的太阳诱导叶绿素荧光（SIF）和植被指数，分析了过去 20 年北半球 POS 动态的时空格局。结果表明，北半球 POS 呈现出缓慢提前的趋势，而在东北北美地区主要表现为延迟的 POS。在半球和生物群区尺度上，POS 的趋势主要受生长季始期（SOS）而非前 POS 气候的驱动。在灌木林中，SOS 对 POS 趋势的影响最大，而在常绿阔叶林中则最小。这些发现强调了生物节律而非气候因素在探索季节性碳动态和全球碳平衡方面的关键作用。
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