caa a22 4500 44538431X CHVBK 20180317143027.0 cr unu---uuuuu 170323e20110301xx s 000 0 eng 10.1007/s10021-010-9407-5 doi (NATIONALLICENCE)springer-10.1007/s10021-010-9407-5 Complementary Models of Tree Species-Soil Relationships in Old-Growth Temperate Forests [Elektronische Daten] [Alison Cross, Steven Perakis] Ecosystem-level studies identify plant-soil feedbacks as important controls on soil nutrient availability, particularly for nitrogen and phosphorus. Although site- and species-specific studies of tree species-soil relationships are relatively common, comparatively fewer studies consider multiple co-existing species in old-growth forests across a range of sites that vary in underlying soil fertility. We characterized patterns in forest floor and mineral soil nutrients associated with four common tree species across eight undisturbed old-growth forests in Oregon, USA, and used two complementary conceptual models to assess tree species-soil relationships. Plant-soil feedbacks that could reinforce site-level differences in nutrient availability were assessed using the context-dependent relationships model, whereby relative species-based differences in each soil nutrient diverged or converged as nutrient status changed across sites. Tree species-soil relationships that did not reflect strong feedbacks were evaluated using a site-independent relationships model, whereby forest floor and surface mineral soil nutrient pools differed consistently by tree species across sites, without variation in deeper mineral soils. We found that the organically cycled elements carbon, nitrogen, and phosphorus exhibited context-dependent differences among species in both forest floor and mineral soil, and most often followed a divergence model, whereby species differences were greatest at high-nutrient sites. These patterns are consistent with theory emphasizing biotic control of these elements through plant-soil feedback mechanisms. Site-independent species differences were strongest for pools of the weatherable cations calcium, magnesium, potassium, as well as phosphorus, in mineral soils. Site-independent species differences in forest floor nutrients were attributable to one species that displayed significantly greater forest floor mass accumulation. Our findings confirm that site-independent and context-dependent tree species-soil relationships occur simultaneously in old-growth temperate forests, with context-dependent relationships strongest for organically cycled elements, and site-independent relationships strongest for weatherable elements with inorganic cycling phases. These models provide complementary explanations for patterns of nutrient accumulation and cycling in mixed-species old-growth temperate forests. Springer Science+Business Media, LLC (outside the USA), 2010 feedback nationallicence forest floor nationallicence mineral soil nationallicence nutrient availability nationallicence plant-soil interactions nationallicence nitrogen nationallicence phosphorus nationallicence carbon nationallicence base cations nationallicence old-growth nationallicence Cross Alison Department of Forest Ecosystems and Society, Oregon State University, 97331, Corvallis, Oregon, USA aut Perakis Steven US Geological Survey, Forest and Rangeland Ecosystem Science Center, 3200 SW Jefferson Way, 97331, Corvallis, Oregon, USA aut Ecosystems Springer-Verlag 14/2(2011-03-01), 248-260 1432-9840 14:2<248 2011 14 10021 https://doi.org/10.1007/s10021-010-9407-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10021-010-9407-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Cross Alison Department of Forest Ecosystems and Society, Oregon State University, 97331, Corvallis, Oregon, USA aut NATIONALLICENCE 700 1- Perakis Steven US Geological Survey, Forest and Rangeland Ecosystem Science Center, 3200 SW Jefferson Way, 97331, Corvallis, Oregon, USA aut NATIONALLICENCE 773 0- Ecosystems Springer-Verlag 14/2(2011-03-01), 248-260 1432-9840 14:2<248 2011 14 10021 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer