1. 研究背景

[3]

主要结论：作者结合litterfall数据和SIF/EVI数据，揭示了物候的规律

1. 对于光照和降水异步的地区（Rclimate<0，背景是红色）

• 紫色点（赤道地区）：落叶和长叶都在旱季
• 红色点：落叶在旱季，长叶在雨季

2. 对于光照和降水同步的地区（Rclimate>0，背景是蓝色）

• 蓝色点：落叶和长叶都在雨季

2. 凋落物数据集空间分布

[3] 中的数据集 （全球，下图显示时候点和底图有偏移）

[2] 中的数据集 （南美，下图显示时候点和底图有偏移）

[6] 中的数据集（全球，下图显示时候点和底图有偏移）

3. 凋落物数据集来源

• [1] 泛亚热带：Wu J, Su Y, Chen X, et al. Leaf shedding of Pan-Asian tropical evergreen forests depends on the synchrony of seasonal variations of rainfall and incoming solar radiation[J]. Agricultural and Forest Meteorology, 2021, 311: 108691.
• [2] 南美：Gong F, Chen X, Yuan W, et al. Partitioning of three phenology rhythms in American tropical and subtropical forests using remotely sensed solar-induced chlorophyll fluorescence and field litterfall observations[J]. International Journal of Applied Earth Observation and Geoinformation, 2022, 107: 102698.
• [3] 全球：Yang X, Wu J, Chen X, et al. A comprehensive framework for seasonal controls of leaf abscission and productivity in evergreen broadleaved tropical and subtropical forests[J]. The Innovation, 2021, 2(4).
• [4] 中国：Dai Y, Gong F, Yang X, et al. Litterfall seasonality and adaptive strategies of tropical and subtropical evergreen forests in China[J]. Journal of Plant Ecology, 2022, 15(2): 320-334.
• [5] 中国：Liu X, Feng Y, Zhao X, et al. Climatic drivers of litterfall production and its components in two subtropical forests in South China: A 14-year observation[J]. Agricultural and Forest Meteorology, 2024, 344: 109798.
• [6] 全球：Holland, E.A., W.M. Post, E.G. Matthews, J.M. Sulzman, R. Staufer, and O.N. Krankina. 2014. A Global Database of Litterfall Mass and Litter Pool Carbon and Nutrients. ORNL DAAC, Oak Ridge, Tennessee, USA. https://doi.org/10.3334/ORNLDAAC/1244
• [7] Li Q, Chen X, Yuan W, et al. Remote sensing of seasonal climatic constraints on leaf phenology across pantropical evergreen forest biome[J]. Earth’s Future, 2021, 9(9): e2021EF002160.