Seasonal variations in phenological traits: leaf shedding and cambial activity in Parkia nitida Miq. and Parkia velutina Benoist (Fabaceae) in tropical rainforest

Morel, Hélène; Mangenet, Thomas; Beauchêne, Jacques; Ruelle, Julien; Nicolini, Eric-André; Heuret, Patrick; Thibaut, Bernard

doi:10.1007/s00468-015-1177-4

Cited by 30 publications

(26 citation statements)

References 80 publications

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“…However, we show that the dry season consequences on the canopy functioning is not always stress. This is confirmed by dry season observations of leaf flushing [8, 20, 22, 23, 31, 52, 53]; and photosynthesis increase from flux towers [9, 54] and satellite remote sensing [4, 5, 11, 18, 51]. This indicates that during the dry season, these forests might not be limited by water.…”

Section: Discussionsupporting

confidence: 67%

Climate drivers of the Amazon forest greening

Wagner

Hérault

Rossi³

et al. 2017

PLoS ONE

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Our limited understanding of the climate controls on tropical forest seasonality is one of the biggest sources of uncertainty in modeling climate change impacts on terrestrial ecosystems. Combining leaf production, litterfall and climate observations from satellite and ground data in the Amazon forest, we show that seasonal variation in leaf production is largely triggered by climate signals, specifically, insolation increase (70.4% of the total area) and precipitation increase (29.6%). Increase of insolation drives leaf growth in the absence of water limitation. For these non-water-limited forests, the simultaneous leaf flush occurs in a sufficient proportion of the trees to be observed from space. While tropical cycles are generally defined in terms of dry or wet season, we show that for a large part of Amazonia the increase in insolation triggers the visible progress of leaf growth, just like during spring in temperate forests. The dependence of leaf growth initiation on climate seasonality may result in a higher sensitivity of these ecosystems to changes in climate than previously thought.

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Section: Discussionsupporting

confidence: 67%

Climate drivers of the Amazon forest greening

Wagner

Hérault

Rossi³

et al. 2017

PLoS ONE

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“…By contrast to the above observations, changes in cambial activity are not clearly associated with seasonal patterns of precipitation in several tropical evergreen and deciduous trees (Fujii et al., ; Pumijumnong and Wanyaphet, ; Morel et al., ; de Lara and Marcati et al., ). Trouet et al.…”

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confidence: 67%

Changes in cambial activity are related to precipitation patterns in four tropical hardwood species grown in Indonesia

Rahman

Nugroho

Nakaba

et al. 2019

American J of Botany

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Premise Cambial activity in some tropical trees varies intra‐annually, with the formation of xylem rings. Identification of the climatic factors that regulate cambial activity is important for understanding the growth of such species. We analyzed the relationship between climatic factors and cambial activity in four tropical hardwoods, Acacia mangium, Tectona grandis, Eucalyptus urophylla, and Neolamarckia cadamba in Yogyakarta, Java Island, Indonesia, which has a rainy season (November–June) and a dry season (July–October). Methods Small blocks containing phloem, cambium, and xylem were collected from main stems in January 2014, October 2015 and October 2016, and examined with light microscopy for cambial cell division, fusiform cambial cells, and expanding xylem cells as evidence of cambial activity. Results During the rainy season, when precipitation was high, cambium was active. By contrast, during the dry season in 2015, when there was no precipitation, cambium was dormant. However, in October 2016, during the so‐called dry season, cambium was active, cell division was conspicuous, and a new xylem ring formation was initiated. The difference in cambial activity appeared to be related to an unusual pattern of precipitation during the typically dry months, from July to October, in 2016. Conclusions Our results indicate that low or absent precipitation for 3 to 4 months induces cessation of cambial activity and temporal periodicity of wood formation in the four species studied. By contrast, in the event of continuing precipitation, cambial activity in the same trees may continue throughout the year. The frequency pattern of precipitation appears to be an important determinant of wood formation in tropical trees.

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“…Although dendrometer data do not allow for a definitive separation of both processes (e.g. Sheil, ), evidence suggests that wood production in trees from SDTFs, in general, coincides with the period comprised between the start of the radial increment phase and the start of the dry season (Borchert, ; García‐Cervigón et al, ), when water scarcity induces a decrease or stop in the cambial growth (Krepkowski, Bräuning, Gebrekirstos, & Strobl, ; Morel et al, ). Therefore, it is realistic to assume that initial stem increments in our tree species were mainly due to wood production.…”

Section: Discussionmentioning

confidence: 99%

Climate seasonality and tree growth strategies in a tropical dry forest

García‐Cervigón

Camarero

Cueva

et al. 2020

J Vegetation Science

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Questions Do tree species in seasonally dry tropical forests differ in the timing of their secondary growth? And in their growth rates between consecutive years? If so, how are these contrasting patterns linked to seasonality in climatic variables (temperature, precipitation)? Which is the role of leaf phenology and functional traits as drivers of stem radial increment responses to climate? Location A Tumbesian tropical dry forest in southern Ecuador. Methods We used a 12‐year database of stem radial increments to characterize intra‐ and inter‐annual patterns of secondary growth in 13 co‐existing dominant tree species. For each species, we adjusted an additive model to describe intra‐annual increment patterns and created a mean series of annual increments to describe inter‐annual changes. Adjusted increments were then correlated with monthly temperature and rainfall data over the study period, and also with the crown percentage covered by leaves. The role of functional traits (leaf area, wood density, maximum tree height, seed dry mass) was explored using average trait values per species. Results We observed continuous variation in the seasonality of radial increments, ranging from species that started incrementing their diameter as early as first rains occurred in the season to species that showed delayed responses. Variability in intra‐ and inter‐annual increment patterns was explained by functional traits (leaf area and seed dry mass, and maximum height and wood density, respectively) and leaf phenology, but this variation was not clearly matched with any functional trait configuration. This, combined with the absence of homogeneous responses of annual growth rates to climate, suggests the existence of contrasting strategies that virtually vary in a species‐specific fashion. Conclusions Co‐existing tree species in seasonally dry tropical forests show different growth strategies to face intra‐ and inter‐annual climate variations, which may increase the resilience of these forests against projected climatic variations.

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Seasonal variations in phenological traits: leaf shedding and cambial activity in Parkia nitida Miq. and Parkia velutina Benoist (Fabaceae) in tropical rainforest

Cited by 30 publications

References 80 publications

Climate drivers of the Amazon forest greening

Climate drivers of the Amazon forest greening

Changes in cambial activity are related to precipitation patterns in four tropical hardwood species grown in Indonesia

Climate seasonality and tree growth strategies in a tropical dry forest

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