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Biomass dynamics of Erythrina lanceolata as influenced by shoot-pruning intensity in Costa Rica

by Berninger, Frank; Salas, Eduardo (autor/a).
Type: materialTypeLabelBookDescription: : 8 ilustraciones.Subject(s): ERYTHRINA LANCEOLATA | BIOMASA | PODA | CICLO NUTRIENTES EN ECOSISTEMAS | DEFOLIACION | FIJACION DEL NITROGENO | CARBOHIDRATOS | AZUCARES | ARBOLES FORESTALES | MEDICION | MODELOS MATEMATICOS | ECUACIONES ALOMETRICAS | COSTA RICAOnline Resources: Texto completo (En) Summary: Pruning of agroforestry trees, while reducing shade of the crops, usually reduces both biomass production and nitrogen fixation. Short pruning cyc1es are often not sustainable 00 the long run, because tree production declines over subsequent pruning cycles. We compared biomass and labile carbohydrate dynamics of Erythrina lanceolata Standley (Papilionaceae) shade trees under total and partial pruning regimes in a vanilla (Vanilla planifolia L.) plantation in South-western Costa Rica. The highest biomass production was rneasured in the unpruned control, followed by trees with 50% of the 1eaf pruned every three months, while total pruning every six months resulted in the lowest biomass pruductioo. In the more productive treatments, a higher proportion of the production was in branches. Because, the N content of woody branches was high, they were important for nitrogen cycling. In the partial pruning treatrnent more nitrogen was returned to the soil ftom litter and woody branches than fram pruned leaf. Sugar concentrations were not different between treatments and the dynamics of non-structural carbohydrates (sugar and starch) seems to depend more on plant phenology than pruning treatment. However, the starch concentrations in the total pruning were lower than in the other treatments.
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Pruning of agroforestry trees, while reducing shade of the crops, usually reduces both biomass production and nitrogen fixation. Short pruning cyc1es are often not sustainable 00 the long run, because tree production declines over subsequent pruning cycles. We compared biomass and labile carbohydrate dynamics of Erythrina lanceolata Standley (Papilionaceae) shade trees under total and partial pruning regimes in a vanilla (Vanilla planifolia L.) plantation in South-western Costa Rica. The highest biomass production was rneasured in the unpruned control, followed by trees with 50% of the 1eaf pruned every three months, while total pruning every six months resulted
in the lowest biomass pruductioo. In the more productive treatments, a higher proportion of the production was
in branches. Because, the N content of woody branches was high, they were important for nitrogen cycling. In the partial pruning treatrnent more nitrogen was returned to the soil ftom litter and woody branches than fram pruned leaf. Sugar concentrations were not different between treatments and the dynamics of non-structural carbohydrates (sugar and starch) seems to depend more on plant phenology than pruning treatment. However, the starch concentrations in the total pruning were lower than in the other treatments.

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