Título:	Phosphorus pools in soil after land conversion from silvopasture to arable and grassland use
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.
Ano de publicação:	2014
Referência:	Journal of Plant Nutrition and Soil Science, v. 1777, n. 2, p. 159-167, 2014
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.
Thesagro:	Uso da Terra
NAL Thesaurus:	Agricultural soils Silvopastoral systems Zoning
Palavras-chave:	Sistema Silvipastoril
ISSN:	1436-8730
Digital Object Identifier:	dx.doi.org/10.1002/jpln.201200334
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CPAMT)