Meng Fandong, Hong Songbai, Wang Jiawei, Chen Anping, Zhang Yao, Zhang Yichen, Janssens Ivan A, Mao Jiafu, Myneni Ranga B, Peñuelas Josep, Piao Shilong
State Key Laboratory of Tibetan Plateau Earth System and Resources Environment (TPESRE), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China.
Sino-French Institute for Earth System Science, College of Urban and Environmental Sciences, Peking University, Beijing, China.
Ecol Lett. 2023 May;26(5):816-826. doi: 10.1111/ele.14205. Epub 2023 Mar 23.
Global greening, characterized by an increase in leaf area index (LAI), implies an increase in foliar carbon (C). Whether this increase in foliar C under climate change is due to higher photosynthesis or to higher allocation of C to leaves remains unknown. Here, we explored the trends in foliar C accumulation and allocation during leaf green-up from 2000 to 2017 using satellite-derived LAI and solar-induced chlorophyll fluorescence (SIF) across the Northern Hemisphere. The accumulation of foliar C accelerated in the early green-up period due to both increased photosynthesis and higher foliar C allocation driven by climate change. In the late stage of green-up, however, we detected decreasing trends in foliar C accumulation and foliar C allocation. Such stage-dependent trends in the accumulation and allocation of foliar C are not represented in current terrestrial biosphere models. Our results highlight that a better representation of C allocation should be incorporated into models.
全球绿化以叶面积指数（LAI）增加为特征，这意味着叶片碳（C）含量增加。气候变化下叶片碳含量的增加是由于光合作用增强还是碳向叶片的分配增加，目前尚不清楚。在此，我们利用北半球卫星衍生的叶面积指数和太阳诱导叶绿素荧光（SIF），探讨了2000年至2017年叶片变绿期间叶片碳积累和分配的趋势。由于光合作用增强以及气候变化驱动的叶片碳分配增加，叶片碳积累在变绿初期加速。然而，在变绿后期，我们检测到叶片碳积累和叶片碳分配呈下降趋势。当前陆地生物圈模型并未体现出叶片碳积累和分配的这种阶段依赖性趋势。我们的结果强调，应将对碳分配的更好描述纳入模型。
