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Riparian zones play a fundamental role in regulating the amount of\udcarbon (C) and nitrogen (N) that is exported from\udcatchments. However, C and N removal via soil gaseous pathways can\udinfluence local budgets of greenhouse gas (GHG) emissions and\udcontribute to climate change. Over a year, we quantified soil\udeffluxes of carbon dioxide (CO2) and nitrous oxide\ud(N2O) from a Mediterranean riparian forest in order to\udunderstand the role of these ecosystems on catchment GHG\udemissions. In addition, we evaluated the main soil microbial\udprocesses that produce GHG (mineralization, nitrification, and\uddenitrification) and how changes in soil properties can modify the\udGHG production over time and space. Riparian soils emitted larger amounts of CO2\ud(1.2–10 g C m−2 d−1) than N2O\ud(0.001–0.2 mg N m−2 d−1) to the atmosphere\udattributed to high respiration and low denitrification rates. Both\udCO2 and N2O emissions showed a marked (but\udantagonistic) spatial gradient as a result of variations in soil\udwater content across the riparian zone. Deep groundwater tables\udfueled large soil CO2 effluxes near the hillslope, while\udN2O emissions were higher in the wet zones adjacent to the\udstream channel. However, both CO2 and N2O emissions\udpeaked after spring rewetting events, when optimal conditions of\udsoil water content, temperature, and N availability favor microbial\udrespiration, nitrification, and denitrification. Overall, our\udresults highlight the role of water availability on riparian soil\udbiogeochemistry and GHG emissions and suggest that climate change\udalterations in hydrologic regimes can affect the microbial processes\udthat produce GHG as well as the contribution of these systems to\udregional and global biogeochemical cycles

biogeosciences

Soil water content drives spatiotemporal patterns of CO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; and N&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;O emissions from a Mediterranean riparian forest soil