TITLE

Seasonal Changes of Bioelements in the Litter and their Potential Return to Green Leaves in four Species of the Argentine Subtropical Forest

AUTHOR(S)
PALMA, R. M.; DEFRIERI, R. L.; TORTAROLO, M. F.; PRAUSE, J.; GALLARDO, J. F.
PUB. DATE
February 2000
SOURCE
Annals of Botany;Vol. 85 Issue 2, p181
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The aim of this work was to analyse the nutrient concentrations of N, P, Ca, Mg, K and Na in mature leaves, branches and fruits and to investigate relationships between the contents of these bioelements in senescent and fresh leaves in four forest species: Gleditsia amorphoides ( Espina Corona), Patagonula americana (Guayaibí),Chlorophora tinctoria ( Mora) and Astronium balansae (Urunday). The study site was located in the Colonia Benítez Estricta Nature Research (Chaco, Argentina). In this subtropical forest, total litter was collected monthly and was sorted into three groups: (1) leaves; (2) branches and fruit; (3) unidentified. Total dry matter was recorded and analysed for N, P, Ca, Mg, K and Na. Espina Corona had the highest leaf concentrations of N, while Mora had the highest concentrations of Ca and Mg. The highest leaf concentrations of P were found in Espina Corona, Mora and Urunday. No significant differences in K were found among the different species. Na concentrations were higher in Espina Corona and Guayaibí than Mora and Urunday. A marked seasonal variability was observed in the concentrations of N, P and K, with no important differences for Ca and Mg, except in Espina Corona. These variations in nutrient concentrations were greater in leaves than in branches and fruits. N and P were translocated to other tree organs and Ca, Mg and Na were accumulated in mature leaves. The bioelement K is the only one that undergoes leaching and mobilization in all species. Resorbed N and P can be used for the production of new leaf organs in the following annual cycle. This resorption supports a portion of the production of new foliage, diminishing the demand from soil.Copyright 2000 Annals of Botany Company
ACCESSION #
44659405

 

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