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- Title
Phosphorus pools in soil after land conversion from silvopasture to arable and grassland use.
- Authors
Slazak, Anna; Freese, Dirk; Matos, Eduardo S.; Nii-Annang, Seth; Hüttl, Reinhard F.
- Abstract
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 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 ≈ 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.
- Subjects
PHOSPHORUS in soils; SILVOPASTORAL systems; GRASSLANDS; ARABLE land; TILLAGE; LAND use; CALCIUM
- Publication
Journal of Plant Nutrition & Soil Science, 2014, Vol 177, Issue 2, p159
- ISSN
1436-8730
- Publication type
Article
- DOI
10.1002/jpln.201200334