Reducing nutrient loss from farms through silvopastoral practices in coarse-textured soils of Florida,USA |
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| Institution: | 1. Department of Forest Sciences, University of Helsinki, P.O. Box 27, FI-00014,Finland;2. Department of Environmental and Biological Sciences, University of Eastern Finland, Joensuu campus, P.O. Box 111, FI-80101, Joensuu, Finland;3. Natural Resources Institute Finland, Latokartanonkaari 9, Helsinki FI-00790, Finland;4. Water Resources and Environmental Engineering Research Unit, University of Oulu, P.O. Box 4300, FI-90014, Oulun yliopisto, Finland;5. Department of Ecology, University of Oulu, P.O. Box 8000, FI-90014, Oulun yliopisto, Finland;6. Natural Resources Institute Finland, P.O. Box 68, Yliopistokatu 6, Joensuu FI-80101, Finland;7. Finnish Environment Institute, Mechelininkatu 34a, FI-00260 Helsinki, Finland;8. Natural Resources Institute Finland, P.O. Box 413, FI-90014 Oulun yliopisto, Finland;9. Department of Built Environment, Aalto University School of Engineering, P.O. Box 15200, FI-00076 Aalto, Finland |
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| Abstract: | Trees integrated into the range- and pasturelands of Florida could remove nutrients from deeper soil profiles that would otherwise be transported to water bodies and cause pollution. Soil nitrogen (N) and phosphorus (P) concentrations were monitored in three pastures: a treeless pasture of bahiagrass (Paspalum notatum); a pasture of bahiagrass under 20-year-old slash pine (Pinus elliotti) trees (silvopasture); and a pasture of native vegetation under pine trees (native silvopasture). Soil analysis from 10 profiles within each pasture showed that P concentrations were higher in treeless pasture (mean: 9.11 mg kg?1 in the surface to 0.23 mg kg?1 at 1.0 m depth) compared to silvopastures (mean: 2.51 and 0.087 mg kg?1, respectively), and ammonium–N and nitrate–N concentrations were higher in the surface horizon of treeless pasture. The more extensive rooting zones of the combined stand of tree + forage may have caused higher nutrient uptake from silvopastures than treeless system. Further, compared to treeless system, soils under silvopasture showed higher P storage capacity. The results suggest that, compared to treeless pasture, silvopastoral association enhances nutrient retention in the system and thus reduces chances for nutrient transport to surface water. The study reflects the scope for applying ecological-engineering and ecosystem-restoration principles to silvopastoral-system design. |
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