caa a22 4500 467904111 CHVBK 20180406152828.0 cr unu---uuuuu 170328e20061001xx s 000 0 eng 10.1007/s10661-005-9140-2 doi (NATIONALLICENCE)springer-10.1007/s10661-005-9140-2 Soilaluminum, Iron, and Phosphorus Dynamics in Response to Long-Term Experimental Nitrogen and Sulfur Additions at the Bear Brook Watershed in Maine, USA [Elektronische Daten] [Jessica Sherman, Ivan Fernandez, Stephen Norton, Tsutomu Ohno, Lindsey Rustad] Atmospheric deposition of nitrogen (N) and sulfur (S) containing compounds affects soil chemistry in forested ecosystems through (1) acidification and the depletion of base cations, (2) metal mobilization, particularly aluminum (Al), and iron (Fe), (3) phosphorus (P) mobilization, and (4) N accumulation. The Bear Brook Watershed in Maine (BBWM) is a long-term paired whole-watershed experimental acidification study demonstrating evidence of each of these acidification characteristics in a northeastern U.S. forested ecosystem. In 2003, BBWM soils were studied using the Hedley fractionation procedure to better understand mechanisms of response in soil Al, Fe, and P chemistry. Soil P fractionation showed that recalcitrant P was the dominant fraction in these watersheds (49%), followed by Al and Fe associated P (24%), indicating that a majority of the soil P was biologically unavailable. Acidification induced mobilization of Al and Fe in these soils holds the potential for significant P mobilization. Forest type appears to exert important influences on metal and P dynamics. Soils supporting softwoods showed evidence of lower Al and Fe in the treated watershed, accompanied by lower soil P. Hardwood soils had higher P concentrations in surface soils as a result of increased biocycling in response to N additions in treatments. Accelerated P uptake and return in litterfall overshadowed acidification induced P mobilization and depletion mechanisms in hardwoods. Springer Science+Business Media, Inc., 2006 forest soils nationallicence acidity nationallicence aluminum nationallicence iron nationallicence phosphorus nationallicence Sherman Jessica Department of Plant, Soil, and Environmental Sciences, University of Maine, 04469-5722, Orono, USA aut Fernandez Ivan Department of Plant, Soil, and Environmental Sciences, University of Maine, 04469-5722, Orono, USA aut Norton Stephen Department of Earth Sciences, University of Maine, 04469-5790, Orono, USA aut Ohno Tsutomu Department of Plant, Soil, and Environmental Sciences, University of Maine, 04469-5722, Orono, USA aut Rustad Lindsey USDA Forest Service, NH 03824, Durham, USA aut Environmental Monitoring and Assessment Springer Netherlands 121/1-3(2006-10-01), 421-429 0167-6369 121:1-3<421 2006 121 10661 https://doi.org/10.1007/s10661-005-9140-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10661-005-9140-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sherman Jessica Department of Plant, Soil, and Environmental Sciences, University of Maine, 04469-5722, Orono, USA aut NATIONALLICENCE 700 1- Fernandez Ivan Department of Plant, Soil, and Environmental Sciences, University of Maine, 04469-5722, Orono, USA aut NATIONALLICENCE 700 1- Norton Stephen Department of Earth Sciences, University of Maine, 04469-5790, Orono, USA aut NATIONALLICENCE 700 1- Ohno Tsutomu Department of Plant, Soil, and Environmental Sciences, University of Maine, 04469-5722, Orono, USA aut NATIONALLICENCE 700 1- Rustad Lindsey USDA Forest Service, NH 03824, Durham, USA aut NATIONALLICENCE 773 0- Environmental Monitoring and Assessment Springer Netherlands 121/1-3(2006-10-01), 421-429 0167-6369 121:1-3<421 2006 121 10661 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer