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Controls of nitrogen isotope patterns in soil profiles To determine the dominant processes controlling nitrogen (N) dynamics in soils and increase insights into soil N cycling from nitrogen isotope (?15N) data, patterns of 15N enrichment in soil profiles were compiled from studies on tropical, temperate, and boreal systems. The maximum 15N enrichment between litter and deeper soil layers varied strongly with mycorrhizal fungal association, averaging 9.6 � 0.4? in ectomycorrhizal systems and 4.6 � 0.5? in arbuscular mycorrhizal systems. The 15N enrichment varied little with mean annual temperature, precipitation, or nitrification rates. One main factor controlling 15N in soil profiles, fractionation against 15N during N transfer by mycorrhizal fungi to host plants, leads... Categories: Publication; Types: Citation, Journal Citation; Tags: Biogeochemistry, Denitrification, Isotopic fractionation, Modeling, Mycorrhizal fungi, All tags... Nitrogen isotopes, Soil horizons, Soil mixing, Springer Netherlands, Fewer tags Composition, Dynamics, and Fate of Leached Dissolved Organic Matter in Terrestrial Ecosystems: Results from a Decomposition Experiment Fluxes of dissolved organic matter (DOM) are an important vector for the movement of carbon (C) and nutrients both within and between ecosystems. However, although DOM fluxes from throughfall and through litterfall can be large, little is known about the fate of DOM leached from plant canopies, or from the litter layer into the soil horizon. In this study, our objectives were to determine the importance of plant-litter leachate as a vehicle for DOM movement, and to track DOM decomposition [including dissolve organic carbon (DOC) and dissolved organic nitrogen (DON) fractions], as well as DOM chemical and isotopic dynamics, during a long-term laboratory incubation experiment using fresh leaves and litter from several... Categories: Publication; Types: Citation, Journal Citation; Tags: Ecosystems, Springer New York, carbon-isotope ratio, decomposition, dissolved organic carbon (DOC), All tags... dissolved organic matter (DOM), humic substances, isotopic fractionation, leaf litter, Fewer tags