Data/hora: 11/06/2024 18:20:51

Biblioteca(s): | Embrapa Agrossilvipastoril.
Data corrente: | 09/01/2015
Data da última atualização: | 09/01/2015
Autoria: | SLAZAK, A.; FREESE, D.; MATOS, E. da S.; NII-ANNANG, N.; HÜTTL, R. F.
Afiliação: | Anna Slazak, Chair of Soil Protection and Recultivation, Brandenburg University of Technology, Cottbus, Germany; Dirk Freese, Chair of Soil Protection and Recultivation, Brandenburg University of Technology, Cottbus, Germany; EDUARDO DA SILVA MATOS, CPAMT; Seth Nii-Annang, Chair of Soil Protection and Recultivation, Brandenburg University of Technology, Cottbus, Germany; Reinhard F. Hüttl, Helmholtz-Centre Potsdam - GFZ, German Research Centre for Geosciences, Telegrafenberg, Germany.
Título: | Phosphorus pools in soil after land conversion from silvopasture to arable and grassland use
Ano de publicação: | 2014
Fonte/Imprenta: | Journal of Plant Nutrition and Soil Science, v. 1777, n. 2, p. 159-167, 2014
ISSN: | 1436-8730
DOI: | dx.doi.org/10.1002/jpln.201200334
Idioma: | Português
Conteúdo: | Differences in soil P among silvopasture, grassland, and arable lands have been well established. Nevertheless, most of the reports compare soil properties under long-term sites. Thus, there exists little information on the effect of the conversion of silvopasture to arable or grassland use on soil P pools. The objective of the study was to determine the impact of converting silvopasture system (SP) into arable cropping and grassland system on the distribution of P pools and potential P bioavailability. We compared the following systems: SP system, SP converted to arable cropland (SP-AL), SP converted to grassland (SP-GL), and for comparative purposes, a long-term arable cropland (AL). The P fractionation was performed by a sequential extraction scheme, using acid and alkaline extractants on samples collected from the 0?10 and 10?20&#8201;cm soil layers. It was assumed that the large variations in soil-P fractionations are caused by the different management practices associated with land conversion. The results of P fractionation showed a dominance of calcium-bound P, HCl-extractable Pi constituted up to 36% of the soil total P (TP). However, the type of land use did not affect this P fraction. On the other hand, the reduction in labile-Pi and NaOH-Pi fractions observed at the SP-AL site may have led to the decline in readily available P. The soil total organic P (TPo) content was 8% and 17% lower at SP-AL compared to SP and SP-GL site, respectively. Labile organic-P (labile-Po) content was markedly higher at SP site compared to arable soils, and was &#8776; 10% of TPo. The NaOH-Po constituted the highest fraction of the organic-P pool (55%?79% of TPo) across all the study systems, and was positively correlated with TPo (p < 0.01). The study indicates that conversion of SP system in temperate regions to arable cropping with conventional tillage seems to result in the reduction of P availability compared to SP, indicating SP as an important land-use practice.
Palavras-Chave: | Sistema Silvipastoril.
Thesagro: | Uso da Terra.
Thesaurus Nal: | Agricultural soils; Silvopastoral systems; Zoning.
Categoria do assunto: | --
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/115211/1/cpamt-2014-matos-phosphorus-silvopasture.pdf
Registro original: | Embrapa Agrossilvipastoril (CPAMT)
Exemplares: | CPAMT - (279-1) - UPC - AP - DD -  -  -  - DIS