Does drought advance the onset of
autumn leaf senescence in temperate
deciduous forest trees?

Mariën, Bertold; Dox, Inge; Boeck, Hans J. De; Willems, Patrick; Leys, Sebastien; Papadimitriou, Dimitri; Campioli, Matteo

doi:10.5194/bg-2020-337

Cited by 5 publications

(3 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Arend et al ., 2016b ; Fu et al ., 2019a , 2019b , 2019a , 2019b ; Zani et al ., 2020 ), complicating conclusive results about their respective effects and interactions. In addition, inconsistent results have been found for the progress of leaf senescence in response to moderate drought, hot spells and nutritional status under natural conditions in different species (Estiarte & Peñuelas, 2015 ; Xie et al ., 2018 ; Chen et al ., 2020 ; Mariën et al ., 2021 ), underscoring the importance of controlled experiments (but see Fu et al ., 2019a , 2019b , 2019a , 2019b ; Zani et al ., 2020 ).…”

Section: Introductionmentioning

confidence: 99%

Impact of microclimatic conditions and resource availability on spring and autumn phenology of temperate tree seedlings

et al. 2021

View full text Add to dashboard Cite

Microclimatic effects (light, temperature) are often neglected in phenological studies and little is known about the impact of resource availability (nutrient and water) on tree's phenological cycles.• Here we experimentally studied spring and autumn phenology in four temperate trees in response to changes in bud albedo (white-vs. black-painted buds), light conditions (nonshaded vs. ~70% shaded), water availability (irrigated, control and reduced precipitation) and nutrients (low vs. high availability). • We found that higher bud albedo or shade delayed budburst (up to +12 days), indicating that temperature is sensed locally within each bud. Leaf senescence was delayed by high nutrient availability (up to +7 days) and shade conditions (up to +39 days) in all species, except oak. Autumn phenological responses to summer droughts depended on species, with a delay for cherry (+ 7 days) and an advance for beech (-7 days). • The strong phenological effects of bud albedo and light exposure reveal an important role of microclimatic variation on phenology. In addition to the temperature and photoperiod effects, our results suggest a tight interplay between source and sink processes in regulating the end of the seasonal vegetation cycle, which can be largely influenced by resource availability (light, water and nutrients).

show abstract

Section: Introductionmentioning

confidence: 99%

Impact of microclimatic conditions and resource availability on spring and autumn phenology of temperate tree seedlings

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Relatively reliable models exist to predict SOS based on accumulated temperature and photoperiod [8][9][10][11] . In contrast, long-term trends in autumn senescence are less clear 3,[12][13][14] , depend on EOS definitions based on senescence start, leaf discolouration stages, or dormancy 15,16 , and drivers are not well understood 6 . Although experimental evidence exists demonstrating that warm autumn temperatures delay leaf senescence 17 , long-term observations often do not show corresponding phenology trends in spite of persistent autumn warming 18,19 , but see 20 .…”

Section: Main Textmentioning

confidence: 99%

Acclimation of phenology relieves leaf longevity constraints in deciduous forests

et al. 2023

View full text Add to dashboard Cite

Leaf phenology is key for regulating total growing season mass and energy fluxes. Long-term temporal trends towards earlier leaf unfolding are observed across Northern Hemisphere forests. Phenological dates also vary between years, whereby end-of-season (EOS) dates correlate positively with start-of-season (SOS) dates and negatively with growing season total net CO2 assimilation (Anet). These associations have been interpreted as the effect of a constrained leaf longevity or of premature carbon (C) sink saturation -with far-reaching consequences for long-term phenology projections under climate change and rising CO2. Here, we use multi-decadal ground and remote-sensing observations to show that the relationships between Anet and EOS are opposite at the interannual and the decadal time scales. A decadal trend towards later EOS persists in parallel with a trend towards increasing Anet -in spite of the negative Anet-EOS relationship at the interannual scale. This indicates that acclimation of phenology has enabled plants to transcend a constrained leaf longevity or premature C sink saturation over the course of several decades, leading to a more effective use of available light and a sustained extension of the vegetation CO2 uptake season over time..

show abstract

“…Manipulative experiments found that heat stress or dry air had no effect on the start of leaf shedding. (Mari€ en et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Widespread drought‐induced leaf shedding and legacy effects on productivity in European deciduous forests

Descals

Verger

Yin

et al. 2022

Remote Sens Ecol Conserv

View full text Add to dashboard Cite

Heatwaves and droughts are becoming more common and severe in Europe, causing changes in tree phenology, disrupting the sequestration of carbon and causing tree mortality on a continental scale. The responses of leaf shedding to heatwaves and droughts remain uncertain, although temperate deciduous forests may shed their leaves if exposed to extreme heat and water stress. Little information, however, is available about the extent and recurrence of early leaf shedding induced by drought, likely because it occurs in small forest patches and can be discriminated only during a few weeks. We used highly spatiotemporal Sentinel-2 data as evidence of widespread drought-induced early leaf shedding in Europe during 2017-2021. We estimated the timing of leaf shedding from NDVI time series and a threshold-based method that extracts the end of the growing season. Then, we evaluated the heatwave and drought impacts at the end of season by analysing the z-score of Landsat-7 and -8 land surface temperature and the ERA5-Land air temperature and aridity index. The 10-m resolution Sentinel-2 data identified early leaf shedding not detected by the low-resolution (250 m) MODIS sensor. Early leaf shedding was observed across Europe during the entire study period and its occurrence was linked to preceding anomalously high temperatures and arid conditions. Our results also indicated that mean summer NDVI decreased significantly in the years following early leaf shedding, suggesting a legacy decline in vegetation productivity. Our study demonstrates that decametric satellite data can be used to monitor the responses of forests to extreme climate events at the canopy level and indicates that early leaf shedding associated with heatwaves and droughts is more widespread and frequent across the continent than previously thought.

show abstract

Does drought advance the onset of autumn leaf senescence in temperate deciduous forest trees?

Cited by 5 publications

References 36 publications

Impact of microclimatic conditions and resource availability on spring and autumn phenology of temperate tree seedlings

Impact of microclimatic conditions and resource availability on spring and autumn phenology of temperate tree seedlings

Acclimation of phenology relieves leaf longevity constraints in deciduous forests

Widespread drought‐induced leaf shedding and legacy effects on productivity in European deciduous forests

Contact Info

Product

Resources

About