Nodules biomass density in mixed and monospecific stands of Eucalyptus grandis x Eucalyptus urophylla and Acacia mearnsii

Márcio Viera, Mauro Valdir Schumacher, Edenilson Liberalesso

Abstract


We aimed to evaluate the distribution of the nodules biomass density in Acacia mearnsii at monospecific and mixed planting with Eucalyptus grandis x E. urophylla in southern region of Brazil. The nodules biomass quantification was performed at the stand 18th month of age. The collecting was made using a cylindrical steel extractor tube with 7.0 cm of inside diameter in four depths: 0 – 5; 5 – 10; 10 – 20 and 20 – 30 cm. Due to the great variability, the nodules biomass, although being much higher in the monospecific planting of Acacia mearnsii when comparing to mixed planting, did not show significant differences (p > 0.05). The greater nodules density was found in the layers 5 to 10 cm of depth, near to thetree trunk and at the planting line followed by the planting diagonal and row. The nodules biomass density found for the black-wattle (up to 2.4 g dm-3) demonstrates the importance of the use of this atmospheric nitrogen-fixing species in mixed plantings with eucalyptus.

 

DOI: http://dx.doi.org/10.13086/2316-980x.v01n03a03


Keywords


N-fixation; Rhizobium; Symbiotic association; Mixed stands

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General DOI: 10.5902 / 2316980X (the specifics are in the ABSTRACTS - click on the article title, in summary)

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