Laboratorio Ecologia Agricola Institute Botanica Agricola

Spain

Laboratorio Ecologia Agricola Institute Botanica Agricola

Spain
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Marin D.,Laboratorio Ecologia Agricola Institute Botanica Agricola | Guedez Y.,Laboratorio Ecologia Agricola Institute Botanica Agricola | Marquez de Hernandez L.,Laboratorio Ecologia Agricola Institute Botanica Agricola
Revista de la Facultad de Agronomia | Year: 2011

The structure, biomass allocation, N, P, K, Ca and Mg distribution and its turnover rates in Guadua angustifolia (guadua) and Bambusa vulgaris (bamboo) plantations at Experimental Campus of DANAC Foundation (San Javier, Yaracuy state, Venezuela), were studied. Mean dry above ground biomass in bamboo clumps was significantly higher in relation to guadua (631.5 vs 454.9 kg; P<0.05), because of a higher number of culms per plant (32±4 vs 16.3±2.5, P<0.05) in the first species. Also, N, P, K, Ca and Mg accumulation in roots, culms and branches in bamboo were greater than guadua, but no difference was founded in leaves with the exception of Ca which was higher in guadua. Analysis of mineral transfer among soil, biomass and litter, showed that the last one had the higher turnover rates being the main compartment in nutrient cycles.


Marin D.,Laboratorio Ecologia Agricola Institute Botanica Agricola | Guedez Y.,Laboratorio Ecologia Agricola Institute Botanica Agricola | Marquez de Hernandez L.,Laboratorio Ecologia Agricola Institute Botanica Agricola
Revista de la Facultad de Agronomia | Year: 2011

In this research, the provision of N, P, K, Ca and Mg was determined through the litter fall of Bambusa vulgaris and Guadua angustifolia planted at the Experimental Campus of the Foundation for the Agriculture Research DANAC (San Javier, Yaracuy state, Venezuela) located at 10°21'45"N and 68°39'00"W and a height of 107 m.s.n.m. The leaf-litter decomposition was studied in both species, using decomposition bags. The comparison of the total annual values indicated contributions of 149.3±14.8 vs 65±16.6 kg.ha -1), P (25.3±4.2 vs 14.5±3.6 kg.ha -1), K (63±8.7 vs 30±7.8 kg.ha -1) and Ca (91±10 vs 53±7 kg.ha -1) significantly higher for bamboo (P<0,05), though there were not differences regarding Mg (9.1±1.2 vs 7.2±1.9 kg.ha -1).The dynamic of the litterleaf decomposition showed similar tendencies in both species, with a declination of 76% of the initial necromass in bamboo, and 87% in guadua within 218 days of exposure. The decomposition constants were 3.93 estimated for bamboo, and 2.00 for guadua.

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