Vertical canopy gradient in photosynthesis and monoterpenoid emissions: An insight into the chemistry and physiology behind

Šimpraga, Maja; Verbeeck, Hans; Bloemen, Jasper; Vanhaecke, Lynn; Demarcke, M.; Joó, Éva; Pokorska, Olga; Amelynck, Crist; Schoon, Niels; Dewulf, Jo; Langenhove, Herman Van; Heinesch, Bernard; Aubinet, Marc; Steppe, Kathy

doi:10.1016/j.atmosenv.2013.07.047

Cited by 13 publications

(8 citation statements)

References 68 publications

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“…However, a recent study found a contrasting interspecific vertical structuring of emission capacities, with more emitting species and higher species‐maximum emission rates in the midcanopy of an Amazonian forest (Table 1; Taylor et al ., 2021). Similarly, within European beech crowns, monoterpene emissions were highest in semishaded leaves beneath the canopy surface (Table 1; Šimpraga et al ., 2013). This pattern may indicate the importance of temporal variability in thermal conditions as distinct from the long‐term average.…”

Section: Review Of Vertical Gradientsmentioning

confidence: 99%

Thermal sensitivity across forest vertical profiles: patterns, mechanisms, and ecological implications

et al. 2022

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Rising temperatures are influencing forests on many scales, with potentially strong variation vertically across forest strata. Using published research and new analyses, we evaluate how microclimate and leaf temperatures, traits, and gas exchange vary vertically in forests, shaping tree, and ecosystem ecology. In closed-canopy forests, upper canopy leaves are exposed to the highest solar radiation and evaporative demand, which can elevate leaf temperature (T leaf ), particularly when transpirational cooling is curtailed by limited stomatal conductance. However, foliar traits also vary across height or light gradients, partially mitigating and protecting against the elevation of upper canopy T leaf . Leaf metabolism generally increases with height across the vertical gradient, yet differences in thermal sensitivity across the gradient appear modest. Scaling from leaves to trees, canopy trees have higher absolute metabolic capacity and growth, yet are more vulnerable to drought and damaging T leaf than their smaller counterparts, particularly under climate change. By contrast, understory trees experience fewer extreme high T leaf 's but have fewer cooling mechanisms and thus may be strongly impacted by warming under some conditions, particularly when exposed to a harsher microenvironment through canopy disturbance. As the climate changes, integrating the patterns and mechanisms reviewed here into models will be critical to forecasting forest-climate feedback.

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Section: Review Of Vertical Gradientsmentioning

confidence: 99%

Thermal sensitivity across forest vertical profiles: patterns, mechanisms, and ecological implications

et al. 2022

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“…This suggests that cloudiness that reduces penetration of solar radiation to the canopy ( Niinemets, 2018 ) may reduce carbon allocation to volatile PSCs. However, in the canopy of Fagus sylvatica , MT emissions were highest in the semi-shaded leaves ( Simpraga et al, 2013 ).…”

Section: Responses To Abiotic Factors – Emission Of Volatile Pscsmentioning

confidence: 99%

Climate Change Effects on Secondary Compounds of Forest Trees in the Northern Hemisphere

et al. 2018

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Plant secondary compounds (PSCs), also called secondary metabolites, have high chemical and structural diversity and appear as non-volatile or volatile compounds. These compounds may have evolved to have specific physiological and ecological functions in the adaptation of plants to their growth environment. PSCs are produced by several metabolic pathways and many PSCs are specific for a few plant genera or families. In forest ecosystems, full-grown trees constitute the majority of plant biomass and are thus capable of producing significant amounts of PSCs. We summarize older literature and review recent progress in understanding the effects of abiotic and biotic factors on PSC production of forest trees and PSC behavior in forest ecosystems. The roles of different PSCs under stress and their important role in protecting plants against abiotic and biotic factors are also discussed. There was strong evidence that major climate change factors, CO2 and warming, have contradictory effects on the main PSC groups. CO2 increases phenolic compounds in foliage, but limits terpenoids in foliage and emissions. Warming decreases phenolic compounds in foliage but increases terpenoids in foliage and emissions. Other abiotic stresses have more variable effects. PSCs may help trees to adapt to a changing climate and to pressure from current and invasive pests and pathogens. Indirect adaptation comes via the effects of PSCs on soil chemistry and nutrient cycling, the formation of cloud condensation nuclei from tree volatiles and by CO2 sequestration into PSCs in the wood of living and dead forest trees.

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“…Dynamic plant adaptation causes a spatio-temporal diversity of plant biochemistry, physiology, and structure along gradients of critical growth limiting factors (i.e., light, temperature, water) (Long, Humphries, & Falkowski, 1994;Nemani et al, 2003;Running et al, 2004), determining functional vegetation processes to be dependent on environmental conditions. Such diversity appears at various spatial scales but also in plant canopies along a vertical gradient of light interception, determining a vertical variation of plant functioning and structure Ellsworth & Reich, 1993;Legner, Fleck, & Leuschner, 2014;Simpraga et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Impact of varying irradiance on vegetation indices and chlorophyll fluorescence derived from spectroscopy data

Damm

Guanter

Verhoef

et al. 2015

Remote Sensing of Environment

101

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Vertical canopy gradient in photosynthesis and monoterpenoid emissions: An insight into the chemistry and physiology behind

Cited by 13 publications

References 68 publications

Thermal sensitivity across forest vertical profiles: patterns, mechanisms, and ecological implications

Thermal sensitivity across forest vertical profiles: patterns, mechanisms, and ecological implications

Climate Change Effects on Secondary Compounds of Forest Trees in the Northern Hemisphere

Impact of varying irradiance on vegetation indices and chlorophyll fluorescence derived from spectroscopy data

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