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Litter yield in shrubs of larrea in the andean piedmont of Mendoza, Argentina

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Abstract

The production of litter was measured for the piedmont communities of Larrea divaricata ssp. dicaricata (1500 m asl) and L. cuneifolia (1130 m asl) near Mendoza, Argentina. Litter was collected in traps randomly distributed in each stand: herbaceous, shrubby and uncovered soil. The monthly average weight of litter was recorded in each stand during one year and discontineously during other two years more.

The material was classified as: leaves and fruits of Larrea sp., fruits of Stipa sp. (by its relative abundance), gramineous and non gramineous material. The litter and the soil in each sample were bromatologically analyzed and the N, Ca and P levels also determined.

The annual contribution of nutrients was calculated totally and layer by layer. The L. cuneifolia and the L. divaricata thickets produce 4,71 t.ha-1 year-2 and 2,02 t.ha-1.year-2 of litter respectively, that mean 78,66 kg/ha of N, 4,24 kg/ha of P and 94,2 kg/ha of Ca in the first thicket and 31,14 kg/ha of N, 1,82 kg/ha of P and 34,17 kg/ha of Ca in the second one; in one year of study.

Zusammenfassung

In den Larrea divaricata ssp. divaricata und L. cuneifolia Gebüschen des mendoziner Andenvorlandes (1500 m und 1130 m Meereshöhe) wurde die Streuproduktion untersucht. Die Streu wurde getrennt nach Strauchschit, Krauchschit und nacktem Boden in Fallen gesammelt, die stichprobenartig in den Beständen verteilt waren. Ein Jahr lang wurde in jedem Bestand der monatliche Streuanfall ermittelt, wobei die Bläter und Früchte von Larrea von den Stipa-Früchten zwecks Berechnung der relativen Mengen-, grasartige und nicht grasartige, getrennt wurden. Streu und Boden der Bestän wurden bromatologisch analysiert und die Stockstoff, Kalk und Phosphorgehalte bestimmt Derjärliche Nährstoffeintrag wurde schichtweise und als Gesamtmenge berechnet. Das Larrea cuneifolia Gebüsch erzeuchte järlich 4,71 T/ha und das L. divaricata 2,20 T/ha Streu. Diese enthielt 78,66 kg/ha N, 4,24 kg/ha P und 94,20 T/ha Ca im L. cuneifolia-und 31,14 kg/ha N, 1,82 kg/ha P, 34,17 kg/ha Ca im L. divaricata-Gebüsch.

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Carretero, E.M., Dalmasso, A.D. Litter yield in shrubs of larrea in the andean piedmont of Mendoza, Argentina. Vegetatio 101, 21–33 (1992). https://doi.org/10.1007/BF00031912

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