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Full-Text Articles in Biology
Contrasting Soil Nitrogen Dynamics Across A Montane Meadow And Urban Lawn In A Semi-Arid Watershed, Steven J. Hall, Michelle A. Baker, Scott B. Jones, John M. Stark, David R. Bowling
Contrasting Soil Nitrogen Dynamics Across A Montane Meadow And Urban Lawn In A Semi-Arid Watershed, Steven J. Hall, Michelle A. Baker, Scott B. Jones, John M. Stark, David R. Bowling
Biology Faculty Publications
Urbanization substantially increases nitrogen (N) inputs and hydrologic losses relative to wildland ecosystems, although the fate of N additions to lawns and remnant grasslands remains contested. In montane semi-arid ecosystems, N cycling is often closely coupled to snowmelt (the dominant period of infiltration) and snow cover, which impact soil temperature and moisture. Here, we compared soil N dynamics between a fertilized and irrigated urban lawn and nearby riparian meadow in Salt Lake City, Utah during a snow manipulation experiment. Snow removal increased freeze/thaw events but did not affect N pools, microbial biomass, denitrification potential, or soil oxygen (O2). Mineral N …
Stream Water Nitrogen Inputs Reflects Groundwater Across A Snowmelt-Dominated Montane-To-Urban Watershed, Steven J. Hall, Samantha R. Weintraub, David Eiriksson, Paul D. Brooks, Michelle A. Baker, Gabriel J. Bowen, David R. Bowling
Stream Water Nitrogen Inputs Reflects Groundwater Across A Snowmelt-Dominated Montane-To-Urban Watershed, Steven J. Hall, Samantha R. Weintraub, David Eiriksson, Paul D. Brooks, Michelle A. Baker, Gabriel J. Bowen, David R. Bowling
Biology Faculty Publications
Snowmelt dominates the hydrograph of many temperate montane streams, yet little work has characterized how streamwater sources and nitrogen (N) dynamics vary across wildland to urban land use gradients in these watersheds. Across a third-order catchment in Salt Lake City, Utah, we asked where and when groundwater vs shallow surface water inputs controlled stream discharge and N dynamics. Stream water isotopes (δ2H and δ18O) reflected a consistent snowmelt water source during baseflow. Near-chemostatic relationships between conservative ions and discharge implied that groundwater dominated discharge year-round across the montane and urban sites, challenging the conceptual emphasis on direct stormwater inputs to …
Managing The Spread Of Alfalfa Stem Nematodes (Ditylenchus Dipsaci): The Relationship Between Crop Rotation Periods And Pest Re-Emergence, S. Jordan, Claudia Nischwitz, Ricardo A. Ramirez, L. Gordillo
Managing The Spread Of Alfalfa Stem Nematodes (Ditylenchus Dipsaci): The Relationship Between Crop Rotation Periods And Pest Re-Emergence, S. Jordan, Claudia Nischwitz, Ricardo A. Ramirez, L. Gordillo
Biology Faculty Publications
Alfalfa is a critical cash/rotation crop in the western region of the United States, where it is common to find crops affected by the alfalfa stem nematode (Ditylenchus dipsaci). Understanding the spread dynamics associated with this pest would allow end-users to design better management programs and farming practices. This is of particular importance given that there are no nematicides available against alfalfa stem nematode and control strategies largely rely on crop rotation to non-host crops or by planting resistant varieties. I present a basic host-parasite model that describes the spread of the alfalfa stem nematode on alfalfa crops. With this …