Particles in humus leaching solution influence the input–output budget of the major elements in a beech forest

As forest ecosystems generally develop on poor and unfertilized soils, nutrient cycles and input/output budgets, notably in the humus compartment, are key to determining forest sustainability. Previous studies generally focused on the ecosystem scale or only on C, N, P in the humus layer. Our object...

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Bibliographic Details
Published in:Biogeochemistry 2020-11, Vol.151 (1), p.1-14
Main Authors: Dincher, Marie, Calvaruso, Christophe, Turpault, Marie-Pierre
Format: Article
Language:English
Subjects:
Atmospheric particulates
Beech
Biogeosciences
Budgets
Cycles
Decomposing organic matter
Dust
Dust storms
Earth and Environmental Science
Earth Sciences
Ecological monitoring
Ecosystems
Environmental Chemistry
Forest ecosystems
Forest management
Fungi
Humus
Leaching
Life Sciences
Litter fall
Magnesium
Major elements
Manganese
Nutrient cycles
ORIGINAL PAPERS
Particulates
Plant tissues
Sedimentation
Silicon
Soil
Soils
Sustainability
Terrestrial ecosystems
Uptake
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Summary:As forest ecosystems generally develop on poor and unfertilized soils, nutrient cycles and input/output budgets, notably in the humus compartment, are key to determining forest sustainability. Previous studies generally focused on the ecosystem scale or only on C, N, P in the humus layer. Our objectives in this study are to establish these budgets for principal elements, considering dust inputs and, for the first time, particulate outputs. To achieve these objectives, the inputs and outputs of the elements in litterfall, particulates (dust inputs and particulates in the outgoing solution) and solution were quantified in mulls in two contrasting soils in beech ecosystems monitored for 7 years. The concentrations of the elements in the particulate outputs were 3 or 16 times higher than those in dust, because some particles were produced in the humus. The input/output budgets were balanced for K, Na and S in both soils and for P, Si and Mg in one soil. These elements were transported in the humus mainly as a solution or as a soluble form in plant tissues. For Ca and Mn in both soils and for P, Si and Mg in one soil, the elements found in biominerals, the inputs were higher than the outputs, indicating that other outputs were not taken into account in this balance, such as biomineral sedimentation or uptake by fungi. These results show the importance of the humus particles in element cycles.
ISSN:0168-2563
1573-515X
DOI:10.1007/s10533-020-00702-6