Denitrification in sediments of headwater streams in the southern Appalachian Mountains, USA
نویسندگان
چکیده
منابع مشابه
Denitrification potential in sediments of headwater streams in the southern Appalachian Mountains, USA
Abstruct. We investigated variations in resource availability (NO,-N and labile organic C [=I) as determinants of potential denitrification in stream sediments in the southern Appalachian Mountains, USA. stream-water and sediments were sampled seasonally in 2 streams of contrasting NO,N availability, Noland Creek (high NO,-N) and Walker Branch (low NO,-N). Eight additional streams with varying ...
متن کاملPredicting fine-scale distributions of peripheral aquatic species in headwater streams
Headwater species and peripheral populations that occupy habitat at the edge of a species range may hold an increased conservation value to managers due to their potential to maximize intraspecies diversity and species' adaptive capabilities in the context of rapid environmental change. The southern Appalachian Mountains are the southern extent of the geographic range of native Salvelinus fonti...
متن کاملTransport and fate of nitrate in headwater agricultural streams in Illinois.
Nitrogen inputs to the Gulf of Mexico have increased during recent decades and agricultural regions in the upper Midwest, such as those in Illinois, are a major source of N to the Mississippi River. How strongly denitrification affects the transport of nitrate (NO(3)-N) in Illinois streams has not been directly assessed. We used the nutrient spiraling model to assess the role of in-stream denit...
متن کاملInfluence of geomorphological variability in channel characteristics on sediment denitrification in agricultural streams.
Within fluvial systems, the spatial variability of geomorphological characteristics of stream channels and associated streambed properties can affect many biogeochemical processes. In agricultural streams of the midwestern USA, it is not known how geomorphological variability affects sediment denitrification rates, a potentially important loss mechanism for N. Sediment denitrification was measu...
متن کاملChanges to southern Appalachian water yield and stormflow after loss of a foundation species
Few studies have examined how insect outbreaks affect landscape-level hydrologic processes. We report the hydrologic effects of the invasive, exotic hemlock woolly adelgid (HWA) in a headwater catchment in the southern Appalachian Mountains. The study watershed experienced complete mortality of an evergreen tree species, Tsuga canadensis (L.) Carr. (eastern hemlock), after infestation was first...
متن کامل