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Direct and indirect effects of spring phenology on forest transpiration
Agricultural and Forest Meteorology ( IF 5.6 ) Pub Date : 2025-05-31 , DOI: 10.1016/j.agrformet.2025.110661
Lvlv Wang, Dunxian She, Yuting Yang, Lin Meng, Jun Xia
Agricultural and Forest Meteorology ( IF 5.6 ) Pub Date : 2025-05-31 , DOI: 10.1016/j.agrformet.2025.110661
Lvlv Wang, Dunxian She, Yuting Yang, Lin Meng, Jun Xia
Vegetation phenology serves as a crucial impact on terrestrial ecosystem, yet its long-term effects on hydrological process, especially seasonal transpiration changes, remain understudied compared to the extensive vegetation-carbon coupling. Here, leveraging long-term solar-induced chlorophyll fluorescence (SIF) and satellite-retrieved vegetation transpiration (TR) datasets, we assessed the response of vegetation transpiration to phenology change during the start of the growing season (SOS) and peak of season (POS) spanning 1982‒2018 in China. By decomposing the increase in cumulative TR during SOS and POS into two parts, i.e. the TRpheno due to earlier SOS and TRproduct driven by vegetation productivity, we found that a one-day SOS advancement directly increased TRpheno by 1.80 ± 0.44 mm, while indirectly reduced TRproduct by -1.08 ± 0.80 mm. This indirect effect was due to a higher spring SIF induced by earlier SOS, which accelerated TRpheno but also exacerbated soil moisture depletion, limiting the subsequent TRproduct. The direct and indirect effects of spring phenology on TR was found to strengthen over last 37 years using a 15-year moving window analysis. Additionally, differences among plant species underscored the role of plants hydraulic traits in regulating transpiration. Needleleaf forest exhibited a smaller increase in SIF and positive relationship between SIF and soil moisture, thereby mitigating the moisture constrain on TRproduct increasing (coefficient = 0.11, p < 0.05). Our findings highlighted the phenological feedback on hydrological cycle through plant transpiration processes, emphasizing the importance of accounting for plant-environmental interactions in hydrological projections under climate change.
更新日期：2025-06-01
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