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3. The local extinction of one of the greatest terrestrial ecosystem engineers, the giant armadillo (Priodontes maximus), in one of its last refuges in the Atlantic Forest, will be felt by a large vertebrate community

Author

Fontes, Bruno Lucas, Desbiez, Arnaud Leonard Jean, Massocato, Gabriel Fávero, Srbek-Araujo, Ana Carolina, Sanaiotti, Tânia Margarete, Bergallo, Helena Godoy, Ferreguetti, Átilla Colombo, Noia, Carlos Hartur Ribeiro, Schettino, Vitor Roberto, Valls, Renata, Moreira, Danielle de Oliveira, Gatti, Andressa, Mendonça, Eduardo de Sá, and Banhos, Aureo

Published
2020
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9. Characteristics, Residue Decomposition, and Carbon Mineralization of Leguminous and Spontaneous Plants in Coffee Systems.

Author

Matos, Eduardo da Silva, Cardoso, Irene Maria, Souto, Renata Lucia, de Lima, Paulo Cesar, and Mendonca, Eduardo de Sa

Subjects
AGRICULTURAL ecology, GREEN manure crops, NUTRIENT cycles, CROP residues, BIODEGRADATION, CARBON, BIOMINERALIZATION, LEGUMES, COFFEE
Abstract

We investigated the chemical and biochemical composition, residue decomposition, and mineralization rate of leguminous (Cajanus cajan, Crotalaria spectabilis, and Lablab purpureus) and spontaneous vegetation in two experimental coffee systems in southeast Brazil. The nitrogen (N) content of the shoot biomass varied from 19.3 to 45.7 g kg-1, and phosphorus (P) content ranged from 1.6 to 3.8 g kg-1. C. cajan contained the greatest values of N and P, whereas spontaneous plants had the lowest values. In both areas, spontaneous vegetation had the greatest values of carbon (C) / P, C/N, polyphenol/N, and (lignin + polyphenol) / N ratios. Decomposition rate increased in the order C. cajan < C. spectabilis < L. purpureus < spontaneous vegetation. There was no correlation between the chemical and biochemical composition and the decomposition rate under field conditions. However, the cumulative carbon dioxide (C-CO2) produced by the residues under laboratory conditions was correlated positively with initial contents of N and P and negatively with polyphenol/N and (lignin + polyphenol) / N ratio (P < 0.01) throughout the sampling period. The low nutrient content, especially for N, of spontaneous vegetation is compensated by the greater decomposition rate under natural conditions than that of introduced species. Management of the spontaneous plants is therefore an attractive alternative for sustainable agriculture. [ABSTRACT FROM AUTHOR]

Published
2011
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