Litter quality and decomposition responses to drought in a northeastern US deciduous forest

Even though drought impacts on tree physiology have been identified, whether drought affects leaf litter chemistry that, in turn, influences litter decay rates is still poorly understood. We compared litter quality and decomposition for two cohorts of leaves from five co-occurring seasonally deciduo...

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Veröffentlicht in:Oecologia 2022-10, Vol.200 (1-2), p.247-257
Hauptverfasser: Wilson, Alexis M., Burtis, James C., Goebel, Marc, Yavitt, Joseph B.
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description Even though drought impacts on tree physiology have been identified, whether drought affects leaf litter chemistry that, in turn, influences litter decay rates is still poorly understood. We compared litter quality and decomposition for two cohorts of leaves from five co-occurring seasonally deciduous tree species: Acer saccharum , Tilia americana , Quercus rubra , Quercus alba , and Ostrya virginiana . One cohort experienced a growing-season drought, and the other cohort came from the same trees in the ensuing, post-drought growing season. Leaf litter production was greater for drought litter than post-drought litter for all five species. Specific leaf area and nitrogen concentrations were 20% greater for the drought cohort than the post-drought cohort. Concentrations of non-structural carbohydrates were about 14% greater for the drought cohort, except for greater values for post-drought A. saccharum litter. Pectin in the middle lamella of leaf litter was 31% lower for the drought cohort compared to post-drought cohort. We found few differences in litter decay rates between drought and post-drought cohorts, although Q. rubra litter had more decomposition for the post-drought cohort than the drought cohort, whereas A. saccharum litter had more decomposition for the drought cohort than the post-drought cohort. Leaf litter decay rates for the drought cohort were related to litter nitrogen and lignin concentrations, whereas decay rates for the post-drought cohort were related to litter carbohydrate concentrations. Our findings suggest that the role of drought events on seasonally deciduous forest ecosystems must recognize species-specific, idiosyncratic responses in leaf litter quality and decomposition.
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subjects Acer saccharum
Biomedical and Life Sciences
Carbohydrates
Cohorts
Decay
Decay rate
Deciduous forests
Deciduous trees
Decomposition
Drought
Ecology
Ecosystem Ecology–Original Research
Ecosystems
Environmental impact
Forest ecosystems
Growing season
Hydrology/Water Resources
Lamella
Leaf area
Leaf litter
Leaves
Life Sciences
Lignin
Nitrogen
Ostrya virginiana
Pectin
Physiological aspects
Plant Sciences
Plant species
Quercus alba
Quercus rubra
Terrestrial ecosystems
Tilia americana
title Litter quality and decomposition responses to drought in a northeastern US deciduous forest
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