Nitrogen resorption and fractionation during leaf senescence in typical tree species in Japan

Enta, Ayako; Hayashi, Mika; Caceres, Maximo Larry Lopez; Fujiyoshi, Lei; Yamanaka, Toshiro; Oikawa, Akira; Seidel, Felix

doi:10.1007/s11676-019-01055-z

Cited by 11 publications

(9 citation statements)

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“…Subsequently, N was stored in a sequential temporal pattern: first, it was stored in coarse roots during the pre-abscission stage, followed by N storage in the sapwood in the post-abscission stage. In previous studies [14,16,35,37], this temporal pattern of N storage in coarse roots and sapwood of deciduous trees has not been shown. In the post-abscission stage, when most N was stored, roots tended to store more N (ns) than sapwood.…”

Section: Reabsorption Storage and Remobilization Of N In Plant Tissuesmentioning

confidence: 78%

“…(3) During the shoot growth stage, 15 N increased in leaves and leaf FAAC increased in comparison to litter. (4) During the green leaf stage, FAAC was low, as free amino acids were synthesised into proteins [35], and leaf δ 15 N showed no variation.…”

Section: Correlation Between Free Amino Acid Content and Plant Tissuementioning

confidence: 99%

“…The N cycle in Fagus crenata followed a well-established pattern: in the green leaf stage, most N was bound in leaves' photosynthetic apparatus [35]. In the pre-abscission stage, leaf N was reabsorbed until leaf abscission.…”

Section: Reabsorption Storage and Remobilization Of N In Plant Tissuesmentioning

confidence: 99%

“…The continuous uptake of soil N during the dormant phase of the tree in the post-abscission stage could also contribute to the high N content found in the shoot growth stage. However, N uptake during dormancy has been reported to be minimal and only few studies have found it for boreal species during warm periods of the winter season [35,39]. Tree internal N storage strongly determines the beech masting period [8,15] and thus, the quantification of N uptake during the dormant period of this species needs to be explored in more detail.…”

Section: Reabsorption Storage and Remobilization Of N In Plant Tissuesmentioning

confidence: 99%

“…FAAC was high in all plant tissues during the shoot growth stage, suggesting that in coarse roots, N was internally remobilized within the tree and also absorbed from the soil. N is transported via sapwood to the emerging leaves to synthesise proteins for building cell walls and the photosynthetic apparatus [35].…”

Section: Plant Tissues Free Amino Acidsmentioning

confidence: 99%

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N Isotope Fractionation in Tree Tissues During N Reabsorption and Remobilization in Fagus crenata Blume

Seidel

Celi

et al. 2019

Forests

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Background and Motivation: Nitrogen content in tissues of Fagus crenata Blume is key for flowering and seed production. However, there is a lack of information on seasonal intra-plant nitrogen partitioning in this representative tree species typical of heavy snowfall regions in Japan. Therefore, the objective of this study was to elucidate Fagus crenata intra-plant nitrogen movement by means of nitrogen content, nitrogen isotope analysis, and amino acids temporal variability. Materials and Methods: Nitrogen content, isotope ratio, and free amino acids content were measured in coarse roots, sapwood, leaves, and litter in four phenological stages in nine adult Fagus crenata trees and upscaled to the whole-tree level.

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Section: Reabsorption Storage and Remobilization Of N In Plant Tissuesmentioning

confidence: 78%

Section: Correlation Between Free Amino Acid Content and Plant Tissuementioning

confidence: 99%

Section: Reabsorption Storage and Remobilization Of N In Plant Tissuesmentioning

confidence: 99%

Section: Reabsorption Storage and Remobilization Of N In Plant Tissuesmentioning

confidence: 99%

Section: Plant Tissues Free Amino Acidsmentioning

confidence: 99%

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N Isotope Fractionation in Tree Tissues During N Reabsorption and Remobilization in Fagus crenata Blume

Seidel

Celi

et al. 2019

Forests

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Increasing tree density accelerates stand‐level nitrogen cycling at the taiga–tundra ecotone in northeastern Siberia

et al. 2022

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As climate warms, tree density at the taiga–tundra ecotone (TTE) is expected to increase, which may intensify competition for belowground resources in this nitrogen (N)‐limited environment. To determine the impacts of increased tree density on N cycling and productivity, we examined edaphic properties indicative of soil N availability along with aboveground and belowground tree‐level traits and stand characteristics related to carbon (C) and N cycling across a tree density gradient of monodominant larch (Larix cajanderi) at the TTE in far northeastern Siberia. We found no consistent evidence from soil, tree, or stand‐level N cycling characteristics of lower N availability or greater intraspecific competition for N with increased density. Active layer thickness declined, but resin‐sorbed N and soil organic layer thickness did not covary with increased tree density. There was, however, greater allocation belowground to stand‐level coarse and fine roots with increased tree density, an allocation pattern suggestive of limited soil resources. Foliar traits related to C (%C, δ13C, and resorption) were responsive to density indicating the importance of non‐nutrient resources, like light, to foliar stoichiometry. As tree density increased and individual trees had lower productivity, tree‐level N and biomass pools aboveground and belowground declined tracking decreases in N uptake, N resorption, N use efficiency, and allocation to slow cycling tissues like wood. At the stand level, our findings show high N turnover with increased N acquisition, allocation to short‐lived tissues with relatively high N content and reduced N residence time, and greater stand productivity as tree density increased. Yet, these positive relationships were curtailed at the highest tree densities. Our observations of shifts in biomass, C and N allocation, and loss aboveground, along with greater root density with increased tree density, could have strong impacts on C and N cycling and should be represented in models of TTE dynamics and feedbacks to climate.

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How beech provenance affects the structure of secondary xylem, leaf traits, and the ectomycorrhizal community under optimal growth conditions

Mrak,

Gričar,

Unuk Nahberger

et al. 2024

Trees

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Key message Provenance controls conductive area of stem secondary xylem, leaf area, and stable isotope (C, N, and O) ratios of beech leaves, while no significant effects were observed for ectomycorrhizal community composition. Abstract Beyond growth parameters and drought tolerance, comparatively little is known about the functioning of different beech (Fagus sylvatica L.) provenances. We investigated properties of leaves, stem secondary xylem, and ectomycorrhiza (ECM), and explored their interdependencies to identify the best performing beech provenance in optimal growth conditions. The study was conducted on 23-year-old trees in a provenance trial. The investigated provenances originated from Atlantic (Belgium—BE), Alpine (Italy—IT, Slovenia—SI), and continental climates (the Czech Republic—CZ). A significant effect of provenance was observed for stem vessel diameters and conductive area, as well as for foliar %C, δ13C, δ15N, and δ18O. δ13C as a proxy of intrinsic water use efficiency (iWUE) showed that the highest iWUE was achieved in BE provenance. Individuals with a better iWUE had wider growth rings regardless of provenance. Better iWUE was associated with lower specific leaf area (SLA). ECM community composition and diversity indices did not differ significantly among the provenances. Specific ECM taxa were associated with individuals with high SLA, δ13C, δ15N, and δ18O. In optimal growth conditions with no stress events, BE is a promising provenance due to an efficient water conducting system with high vessel diameters and conductive area, and high iWUE, while Alpine provenances showed an adaptation of their water conducting system to freezing conditions at their original locations. Integrating findings from different compartments improves our understanding of functioning of different beech provenances.

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Nitrogen resorption and fractionation during leaf senescence in typical tree species in Japan

Abstract: isotope ratio in beech but not in the other tree species. The results of this study showed that it is possible to infer the type and timing of processes relevant to N resorption by analyzing leaf δ 15 N variation during senescence.

Cited by 11 publications

References 50 publications

N Isotope Fractionation in Tree Tissues During N Reabsorption and Remobilization in Fagus crenata Blume

N Isotope Fractionation in Tree Tissues During N Reabsorption and Remobilization in Fagus crenata Blume

Increasing tree density accelerates stand‐level nitrogen cycling at the taiga–tundra ecotone in northeastern Siberia

How beech provenance affects the structure of secondary xylem, leaf traits, and the ectomycorrhizal community under optimal growth conditions

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