Ronglei Zhou , Yangyang Liu , Xueqing Wang , Xu Chen , Gaohui Duan , Peidong Han , Ziqi Lin , Haijing Shi , Zhongming Wen
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This study aims to quantitatively assess the response of global autumn phenology to observed drought cumulative and lagged effects based on EOS and multi time-scales drought index (the Standardized Precipitation and Evapotranspiration Index, SPEI), and analyze the potential impact path of climate variables on EOS-SPEI relationship. Our results suggested that the cumulative and lagged effects of drought had a significant impact on the autumn phenology of approximately 27.00% and 48.73% of the vegetated area, respectively. The accumulated months were mostly concentrated on shorter time scales (1- to 3-month), and the lagged effect was mostly concentrated on 1 to 3 lagged months. These two effects on EOS were similar in different biomes and water availability, demonstrating that diverse biomes have different adaptation strategies to drought and the importance of water available for ecosystem drought mitigation. Precipitation and solar radiation had a direct negative impact on evaporation, whereas evaporation had a substantial directly positive impact on the intensity of drought effect on autumn phenology. The interaction between the climatic variables results in the accumulated months being directly positively regulated by thermal radiation, while the lagged months were directly positively influenced by precipitation, which indicates that the hydrothermal conditions at the onset of EOS occurrence govern the autumn phenology response to drought more than the occurrence time of EOS.</p></div>","PeriodicalId":362,"journal":{"name":"Journal of Hydrology","volume":null,"pages":null},"PeriodicalIF":5.9000,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Evaluating the effect of Multi-Scale droughts on autumn phenology of global land biomes with satellite observation\",\"authors\":\"Ronglei Zhou , Yangyang Liu , Xueqing Wang , Xu Chen , Gaohui Duan , Peidong Han , Ziqi Lin , Haijing Shi , Zhongming Wen\",\"doi\":\"10.1016/j.jhydrol.2024.131547\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The end of the growing season (EOS), autumn phenology, is a significant indicator of vegetation health in terrestrial ecosystems. 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引用次数: 0
摘要
生长季末期（EOS），即秋季物候，是陆地生态系统植被健康的一个重要指标。频率更高、强度更大的干旱预计会对生态系统的平衡产生更大的影响，因此迫切需要确定时间效应对秋季物候的影响，以提高对生态系统恢复力和抵抗力以及植物碳汇稳定性的认识。本研究旨在基于EOS和多时间尺度干旱指数（标准化降水和蒸散指数，SPEI），定量评估全球秋季物候对观测到的干旱累积效应和滞后效应的响应，并分析气候变量对EOS-SPEI关系的潜在影响路径。结果表明，干旱的累积效应和滞后效应分别对约 27.00% 和 48.73% 的植被面积的秋季物候产生了显著影响。累积月数主要集中在较短的时间尺度上（1 至 3 个月），而滞后效应主要集中在 1 至 3 个滞后月。这两种效应在不同生物群落和不同水源条件下对 EOS 的影响相似，表明不同生物群落对干旱有不同的适应策略，以及水源条件对生态系统干旱缓解的重要性。降水量和太阳辐射对蒸发量有直接的负面影响，而蒸发量对干旱对秋季物候的影响强度有很大的直接正面影响。气候变量之间的交互作用导致累积月份直接受热辐射的正向调节，而滞后月份则直接受降水的正向影响，这表明 EOS 发生初期的水热条件比 EOS 发生时间更能制约秋季物候对干旱的响应。
Evaluating the effect of Multi-Scale droughts on autumn phenology of global land biomes with satellite observation
The end of the growing season (EOS), autumn phenology, is a significant indicator of vegetation health in terrestrial ecosystems. Higher frequency and intensity droughts are expected to have a greater impact on ecosystem homeostasis, and an urgent determination of the impact of temporal effects on autumn phenology is imperative to improve the understanding of ecosystem resilience and resistance and the stability of plant carbon sinks. This study aims to quantitatively assess the response of global autumn phenology to observed drought cumulative and lagged effects based on EOS and multi time-scales drought index (the Standardized Precipitation and Evapotranspiration Index, SPEI), and analyze the potential impact path of climate variables on EOS-SPEI relationship. Our results suggested that the cumulative and lagged effects of drought had a significant impact on the autumn phenology of approximately 27.00% and 48.73% of the vegetated area, respectively. The accumulated months were mostly concentrated on shorter time scales (1- to 3-month), and the lagged effect was mostly concentrated on 1 to 3 lagged months. These two effects on EOS were similar in different biomes and water availability, demonstrating that diverse biomes have different adaptation strategies to drought and the importance of water available for ecosystem drought mitigation. Precipitation and solar radiation had a direct negative impact on evaporation, whereas evaporation had a substantial directly positive impact on the intensity of drought effect on autumn phenology. The interaction between the climatic variables results in the accumulated months being directly positively regulated by thermal radiation, while the lagged months were directly positively influenced by precipitation, which indicates that the hydrothermal conditions at the onset of EOS occurrence govern the autumn phenology response to drought more than the occurrence time of EOS.
期刊介绍：
The Journal of Hydrology publishes original research papers and comprehensive reviews in all the subfields of the hydrological sciences including water based management and policy issues that impact on economics and society. These comprise, but are not limited to the physical, chemical, biogeochemical, stochastic and systems aspects of surface and groundwater hydrology, hydrometeorology and hydrogeology. Relevant topics incorporating the insights and methodologies of disciplines such as climatology, water resource systems, hydraulics, agrohydrology, geomorphology, soil science, instrumentation and remote sensing, civil and environmental engineering are included. Social science perspectives on hydrological problems such as resource and ecological economics, environmental sociology, psychology and behavioural science, management and policy analysis are also invited. Multi-and interdisciplinary analyses of hydrological problems are within scope. The science published in the Journal of Hydrology is relevant to catchment scales rather than exclusively to a local scale or site.
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