Increasing importance of precipitation in spring phenology with decreasing latitudes in subtropical forest area in China
Increasing importance of precipitation in spring phenology with decreasing latitudes in subtropical forest area in China
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随着中国亚热带森林地区纬度的降低，降水在春季物候中的重要性日益增加
DOI：
10.1016/j.agrformet.2021.108427
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发表时间：
2021-07
影响因子：
6.2
通讯作者：
Fanghua Hao
中科院分区：
文献类型：
--
作者：
Xinxi Li;Yongshuo H Fu;Shouzhi Chen;Jingfeng Xiao;Guodong Yin;Xing Li;Xuan Zhang;Xiaojun Geng;Zhaofei Wu;Xuancheng Zhou;Jing Tang;Fanghua Hao
气候变暖显著地促进了北方半球温带和北方生物群落的植物春季物候。然而，亚热带森林物候对气候变化的反应在很大程度上仍然不清楚。本研究旨在确定2002-2017年中国亚热带森林春季光合物候的时空格局，并探讨其响应不同气候变量变化的内在机制。我们采用四种方法从2002年至2017年期间的太阳诱导叶绿素荧光（SIF）数据集中提取光合期（SOP）的开始，并使用偏相关分析确定SOP与环境因子之间的相关性。总体而言，SOP提前了6.8天。此外，我们发现，基于SIF的SOP与基于通量数据的光合开始日期高度相关，表明SIF可以是一个有用的指标，在表征光合物候在亚热带森林。偏相关分析结果表明，在北方亚热带森林中，温度对SOP起主导作用，而降水对SOP的重要性随纬度的降低而增加，降水是南方季风万年青林SOP的主要气候控制因子。这些结果表明，在持续的气候变化下，预测的温度升高和降水制度的转变可能会在很大程度上影响光合物候，从而影响亚热带森林的碳和水循环。
Climate warming has significantly advanced plant spring phenology in temperate and boreal biomes in the northern hemisphere. However, the response of subtropical forest phenology to climate change remains largely unclear. This study aimed to determine the spatiotemporal patterns of spring photosynthetic phenology in subtropical forests in China over the period 2002-2017 and explore its underlying mechanism in response to the changes of different climate variables. We applied four methods to extract the start of the photosynthetic period (SOP) from a solar–induced chlorophyll fluorescence (SIF) data set during the period 2002 to 2017, and determined correlations between SOP and environmental factors using partial correlation analyses. Overall, the SOP was advanced by 6.8 days. Furthermore, we found that the SIF-based SOP is highly correlated with the flux data–based photosynthetic onset dates, demonstrating that SIF can be a useful index in characterizing the photosynthetic phenology in subtropical forests. Interestingly, based on partial correlation analysation temperature dominated the SOP in the northern subtropical forest, but the importance of precipitation increased with decreasing latitudes, and the primary climatic control of SOP in southern monsoon evergreen forests is precipitation. These results suggested that the predicted increase in temperature and shift in precipitation regimes under ongoing climate change might potentially largely affect the photosynthetic phenology, and thus affect the carbon and water cycles in subtropical forests.
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