Exchanges of major elements in a deciduous forest canopy

Turpault, Marie–Pierre; Kirchen, Gil; Calvaruso, Christophe; Redon, Paul-Olivier; Dincher, Marie

doi:10.1007/s10533-020-00732-0

Cited by 15 publications

(14 citation statements)

References 47 publications

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“…The presence of these aforementioned compounds in the leachates and their subsequent digestion would deliver additional Eu content to the solution, leading to the development of positive anomalies in the leachates of Do OLv and Do OLn fractions. This would be in line with Gao et al (2003), Turpault et al (2021) and partially with Stille et al (2006). In fact, if a preferential absorption of Eu by trees had played a role in the development of a positive anomaly in the leaves, we would have observed an enrichment already in the Do FL, which does not occur.…”

Section: Behaviour Of Ca and Eu During Litter Degradationsupporting

confidence: 92%

“…However, the stabilization of cell walls cannot explain the increase in Ca concentrations observed in the litter fractions. This latter case, on the other hand, can be explained by the Ca-translocation mechanism occurring during leaf senescence described by Turpault et al (2021). At high concentrations, Ca is a toxic element for trees and during the senescence is translocated from the other tree organs to the leaves, where it crystalizes under the form of insoluble Ca-bearing biominerals and is released to the litter material during the leaf fall as a form of an anti-toxicity mechanism.…”

Section: Behaviour Of Ca and Eu During Litter Degradationmentioning

confidence: 99%

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Dynamics of rare earth elements and associated major and trace elements during Douglas-fir (Pseudotsuga menziesii) and European beech (Fagus sylvatica L.) litter degradation

et al. 2022

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Abstract. Given the diverse physico-chemical properties of elements, we hypothesize that their incoherent distribution across the leaf tissues, combined with the distinct resistance to degradation that each tissue exhibits, leads to different turnover rates among elements. Moreover, litter layers of varying ages produce diverse chemical signatures in solution during the wet degradation. To verify our hypothesis, Na, K, Mg, Mn, Ca, Pb, Al and Fe were analysed together with the rare earth elements (REE) in the solid fractions and in the respective leachates of fresh leaves and different litter layers of two forested soils developed under Pseudotsuga menziesii and Fagus sylvatica L. trees. The results from the leaching experiment were also compared with the in situ REE composition of the soil solutions to clarify the impact that the litter degradation processes may have on soil solution chemical composition. Both tree species showed similar biogeochemical processes dominating the element dynamics during litter degradation. REE, Al, Fe and Pb were preferentially retained in the solid litter material, in comparison with the other cations, and their concentrations increased over time during the degradation. Accordingly, different litter fractions produced different yields of elements and REE patterns in the leachates, indicating that the tree species and the age of the litter play a role in the chemical release during degradation. In particular, the evolution of the REE patterns, relative to the age of the litter layers, allowed us to deliver new findings on REE fractionation and mobilization during litter decay. Specifically, the degradation of the litter was characterized by a decrease in the Y/Ho ratio and an increase in the LaN/YbN ratio. The relationship between these ratios provided information on the litter species-specific resistance to degradation, with Douglas-fir litter material showing a lower resistance. During the litter degradation of the two tree species, two main differences were highlighted with the help of the REE: (i) in Pseudotsuga menziesii the behaviour of Eu appeared to be linked to Ca during leaf senescence and (ii) species-specific release of organic acids during litter degradation leads to a more pronounced middle REE (MREE) enrichment in the Fagus sylvatica leachates. Finally, we showed the primary control effect that white fungi may have in Ce enrichment of soil solutions, which appears to be associated with the dissolution and/or direct transport of Ce-enriched MnO2 accumulated on the surface of the old litter due to the metabolic functioning of these microorganisms. Similar MREE and heavy REE (HREE) enrichments were also found in the leachates and the soil solutions, probably due to the higher affinity of these elements for the organic acids, which represent the primary products of organic matter degradation.

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Section: Behaviour Of Ca and Eu During Litter Degradationsupporting

confidence: 92%

Section: Behaviour Of Ca and Eu During Litter Degradationmentioning

confidence: 99%

Dynamics of rare earth elements and associated major and trace elements during Douglas-fir (Pseudotsuga menziesii) and European beech (Fagus sylvatica L.) litter degradation

et al. 2022

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“…Therefore, the Eu/Eu* 680 increased value in Do OLn may be due to the partial involvement of Eu in the Ca-dedicated biochemical pathways described above, which would lead to an anomalous accumulation of Eu in respect to the other REE in Douglas-fir litter. The fact that the increase in the Eu/Eu* value has been found in Do OLn and not in Do FL strengthens the assumption that Eu is involved in the same process of translocation of Ca that occurs during the leaves' senescence described by Turpault et al (2021) and previously reported in this chapter. Although the 685 reason for calcium behaving differently in the two tree species during the litter degradation cannot be explained with our experiment, it could be due to possible differences in the chemical and/or mechanical structures of the leaves or in the physiology of the species.…”

Section: Behaviour Of Ca and Eu During Litter Degradation 660supporting

confidence: 89%

Dynamics of Rare Earths and associated major and trace elements during Douglas-fir (Pseudotsuga menziesii) and European beech (Fagus sylvatica L.) litter degradation

Montemagno

Hissler

Bense

et al. 2021

Preprint

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Abstract. Given the diverse physico-chemical properties of elements, we hypothesize that their incoherent distribution across the leaf tissues, combined with the distinct resistance to degradation that each tissue exhibits, leads to distinct turnover rates between elements. Moreover, litter layers of different ages produce diverse chemical signatures in solution during the wet degradation. To verify our hypothesis, Na, K, Mg, Mn, Ca, Pb, Al and Fe were analysed together with the Rare Earth Elements (REE) in the solid fractions and in the respective leachates of fresh leaves and different humus layers of two forested soils developed under Pseudotsuga menziesii and Fagus sylvatica L. trees. The results from the leaching experiment were also compared to the in situ REE composition of the soil solutions to clarify the impact that the litter degradation processes may have on soil solution chemical compositions. Our results clearly show that REE, Al, Fe and Pb were preferentially retained in the solid litter material, in comparison to the other cations, and that their concentrations increased over time during the litter degradation. Accordingly, different litter fractions produced different yields of elements and REE patterns in the leachates, indicating that the tree species and the age of the litter play a role in the chemical release during the degradation. In particular, the evolution of the REE patterns according to the age of the litter layers allowed us to deliver new findings on REE fractionation and mobilization during litter degradation. In particular, the LaN/YbN ratio highlights differences in litter degradation intensity between both tree species, which was not shown with major cations. We finally showed the primary control effect that litter degradation can have on the REE composition of the soil solution, which presents a positive Ce anomaly associated with the dissolution and/or transportation of Ce-enriched MnO2 particles accumulated onto the surface of the old litter due to white fungi activity. Similar MREE and HREE enrichments were also found in the leachates and the soil solution, probably due to their higher affinity to the organic acids, which represent the primary products from the organic matter degradation.

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“…This may be a result of common methods for estimating leaching rates in throughfall and stemflow requiring no knowledge of bark anatomy and physiology, e.g. : (i) multiple regression modeling (Lovett and Lindberg, 1984); (ii) parsing washoff and leaching from intrastorm trends in water chemistry (Kazda and Glatzel, 1986;Kazda, 1990); or (iii) using tracer solutes (Staelens et al, 2008;Turpault et al, 2021). Our results suggest that bark anatomy plays an important role in the leaching of macronutrient cations into waters draining through woody plant canopies.…”

Section: Bark-soaking Experimentsmentioning

confidence: 95%

Bark Effects on Stemflow Chemistry in a Japanese Temperate Forest II. The Role of Bark Anatomical Features

Oka¹,

Takahashi²,

Endoh³

et al. 2021

Front. For. Glob. Change

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A fraction of rainfall drains to the soil surface down tree stems (as “stemflow”), and the resulting stemflow waters can be highly enriched with dissolved nutrients due to prolonged bark contact. To date, stemflow chemistry has been examined mostly in regards to the external morphology of the bark, while its relationship with bark anatomy has received little attention. Arguably, this represents a major knowledge gap, because bark anatomical traits are linked to the storage and transport of soluble (and insoluble) organic materials, and control the proximity of these materials to passing stemflow waters. To initiate this line of investigation, here, we examine bark-water leaching rates for common leachable macronutrient ions (Mg2+, Ca2+, and K+) across six different tree species with varying bark anatomical traits (four deciduous broadleaved and two evergreen coniferous species). These different bark types were subjected to laboratory experiments, including observations of bark anatomy and soaking experiments. Laboratory-derived estimates of leaching rates for Mg2+, Ca2+, and K+ were then analyzed alongside bark anatomical traits. Leaching rates of Mg2+ and Ca2+ appear to be controlled by the thickness of the rhytidome and periderm; while K+ leaching rates appeared to be driven by the presence of cellular structures associated with resource storage (parenchyma) and transfer (sieve cells). Other species-specific results are also identified and discussed. These results suggest that the anatomical features of bark and the concentration of leachable macronutrient ions in stemflow are related, and that these relationships may be important to understand nutrient cycle through the bark. We also conclude that future work on the mechanisms underlying stemflow solute enrichment should consider bark anatomy.

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Exchanges of major elements in a deciduous forest canopy

Cited by 15 publications

References 47 publications

Dynamics of rare earth elements and associated major and trace elements during Douglas-fir (Pseudotsuga menziesii) and European beech (Fagus sylvatica L.) litter degradation

Dynamics of rare earth elements and associated major and trace elements during Douglas-fir (Pseudotsuga menziesii) and European beech (Fagus sylvatica L.) litter degradation

Dynamics of Rare Earths and associated major and trace elements during Douglas-fir (Pseudotsuga menziesii) and European beech (Fagus sylvatica L.) litter degradation

Bark Effects on Stemflow Chemistry in a Japanese Temperate Forest II. The Role of Bark Anatomical Features

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