Data/hora: 23/06/2024 13:39:27

Biblioteca(s): | Embrapa Territorial.
Data corrente: | 15/12/2014
Data da última atualização: | 15/12/2014
Autoria: | AMORIM, L. B.; SALCEDO, I. H.; PAREYN, F. G. C.; ALVAREZ, I. A.
Afiliação: | L. B. AMORIM, INSTITUTO NACIONAL DO SEMIÁRIDO; I. H. SALCEDO, INSTITUTO NACIONAL DO SEMIÁRIDO; F. G. C. PAREYN, ASSOCIAÇÃO PLANTAS DO NORDESTE; IVAN ANDRE ALVAREZ, CNPM.
Título: | Assessment of nutrient returns in a tropical dry forest after clear-cut without burning.
Ano de publicação: | 2014
Fonte/Imprenta: | Nutrient Cycling in Agroecosystems, v. 100, n. 1, sep. 2014.
Páginas: | p. 1-10
ISBN: | 1385-1314
DOI: | 10.1007/s10705-014-9646-5
Idioma: | Português
Conteúdo: | Tropical dry forests (TDFs) are being deforested at unprecedented rates. The slash/burn/ agriculture/fallow-extensive livestock sequence causes significant nutrient losses and soil degradation. Our aim is to assess nutrient inputs and outputs in a TDF area under an alternative management system, for exclusive wood production. The study involved clear-cutting a preserved caatinga TDF site without burning, quantifying nutrients exported in firewood/ timber and nutrients returned to the soil from the litter layer plus the slash debris, left to decompose unburned on the soil surface. Before clear-cut, the litter layer on the forest floor contained 6.1 t ha of dry matter (DM). After clear-cut, the aboveground biomass was 61.9 t DM ha-1 (consisting of 21.5 t DM ha-1 of commercial wood and 40.4 t DM ha-1 of clear-cut debris that did not include the underlying litter layer). The litter layer was composed of fine and coarse litter, with turnovers of 0.86 and 0.31 year-1, respectively, separately measured in uncut control plots during two rainy seasons (Dec-2007/June-2008 and Dec-2008/ June-2009). In a single season, its decomposition returned to the soil 48.4, 1.16 and 12.3 kg ha-1 of N, P and K. The clear-cut debris was mainly composed of branches, 33.4 t ha-1, bromeliads, 5.63 t ha-1 and green leaves, 1.32 t ha-1. In-situ decomposition rates for branches and bromeliads were 0.24 and 1.47 year-1, respectively. After two rainy seasons the clear-cut debris released 206, 6.5 and 106 kg ha-1 of N, P and K respectively. This input plus that of the underlying litter layer exceeded exports in the commercial wood, and replenished a soil nutrient stock (0?30 cm) of approximately the same magnitude.
Palavras-Chave: | Debris decomposition; Litter decomposition; Nutrient cycling.
Thesagro: | Caatinga.
Categoria do assunto: | --
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/113713/1/4238.pdf
Registro original: | Embrapa Territorial (CNPM)
Exemplares: | CNPM - (4238-1) - UPC - AP - DD - 14/091 - AP - 2014.091 - DIS