scholarly journals Detecting the onset of autumn leaf senescence in deciduous forest trees of the temperate zone

2019 ◽  
Vol 224 (1) ◽  
pp. 166-176 ◽  
Author(s):  
Bertold Mariën ◽  
Manuela Balzarolo ◽  
Inge Dox ◽  
Sebastien Leys ◽  
Marchand J. Lorène ◽  
...  
2020 ◽  
Author(s):  
Bertold Mariën ◽  
Inge Dox ◽  
Hans J. De Boeck ◽  
Patrick Willems ◽  
Sebastien Leys ◽  
...  

Abstract. Severe droughts are expected to become more frequent and persistent. However, their effect on autumn leaf senescence, a key process for deciduous trees and ecosystem functioning, is currently unclear. We hypothesized that (I) severe drought advances the onset of autumn leaf senescence in temperate deciduous trees and that (II) tree species show different dynamics of autumn leaf senescence under drought. We tested these hypotheses using a manipulative experiment on beech saplings and three years of monitoring mature beech, birch and oak trees in Belgium. The autumn leaf senescence was derived from the seasonal pattern of the chlorophyll content index and the loss of canopy greenness using generalized additive models and piece-wise linear regressions. Drought did not affect the onset of autumn leaf senescence in both saplings and mature trees, even if the saplings showed a high mortality and the mature trees a high leaf mortality (due to accelerated leaf senescence and early leaf abscission). We did not observe major differences among species. Synthesis: The timing of autumn leaf senescence appears conservative across years and species, and even independent on drought stress. Therefore, to study autumn senescence, seasonal chlorophyll dynamics and loss of canopy greenness should be considered separately.


2003 ◽  
Vol 18 (6) ◽  
pp. 677-694 ◽  
Author(s):  
David W. Lee ◽  
John O'Keefe ◽  
N. Michele Holbrook ◽  
Taylor S. Feild

2021 ◽  
Vol 18 (11) ◽  
pp. 3309-3330
Author(s):  
Bertold Mariën ◽  
Inge Dox ◽  
Hans J. De Boeck ◽  
Patrick Willems ◽  
Sebastien Leys ◽  
...  

Abstract. Severe droughts are expected to become more frequent and persistent. However, their effect on autumn leaf senescence, a key process for deciduous trees and ecosystem functioning, is currently unclear. We hypothesized that (I) severe drought advances the onset of autumn leaf senescence in temperate deciduous trees and (II) tree species show different dynamics of autumn leaf senescence under drought. We tested these hypotheses using a manipulative experiment on beech saplings and 3 years of monitoring mature beech, birch and oak trees in Belgium. The autumn leaf senescence was derived from the seasonal pattern of the chlorophyll content index and the loss of canopy greenness using generalized additive models and piecewise linear regressions. Drought and associated heat stress and increased atmospheric aridity did not affect the onset of autumn leaf senescence in both saplings and mature trees, even if the saplings showed a high mortality and the mature trees an advanced loss of canopy greenness. We did not observe major differences among species. To synthesize, the timing of autumn leaf senescence appears conservative across years and species and even independent of drought, heat and increased atmospheric aridity. Therefore, to study autumn senescence and avoid confusion among studies, seasonal chlorophyll dynamics and loss of canopy greenness should be considered separately.


2010 ◽  
Vol 30 (10) ◽  
pp. 1253-1259 ◽  
Author(s):  
S. G. Keel ◽  
C. Schadel

Planta ◽  
2010 ◽  
Vol 232 (5) ◽  
pp. 1115-1125 ◽  
Author(s):  
Martin Karl-Friedrich Bader ◽  
Rolf Siegwolf ◽  
Christian Körner

2021 ◽  
Author(s):  
Gaston Achoundong ◽  
Martin Cheek

Two tree species are described as new to science: Rinorea spongiocarpa Achound. sp. nov (placed in Rinorea [unranked] Brachypetalae) and Rinorea dimakoensis Achound. sp. nov.( placed in Rinorea [unranked] Ilicifolieae). Both species are endemic to Cameroon, occurring south of the Sanaga river, the first from South and East Regions, occurring in evergreen forest from Ebolowa to Dja, while the second occurs in the northern part of East Region in semi-deciduous forest towards the interface with woodland habitats in the Dimako-Bertoua area. The two species are illustrated, and their affinities and conservation status according to the 2012 IUCN categories and criteria are discussed. Both species are threatened with extinction due to habitat destruction, the first is assessed as Vulnerable, the second Endangered.


Author(s):  
Hermann Von Schrenk ◽  
Perley. Spaulding ◽  
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