نتایج جستجو برای: in highland watersheds

تعداد نتایج: 16977197  

Journal: :Geological Magazine 1951

Journal: :Geographical Review of Japan 1930

Journal: :Frontiers in Physics 2015

Journal: :Journal of environmental quality 2016
Mark B David Corey A Mitchell Lowell E Gentry Ronald K Salemme

Chloride is a relatively unreactive plant nutrient that has long been used as a biogeochemical tracer but also can be a pollutant causing aquatic biology impacts when concentrations are high, typically from rock salt applications used for deicing roads. Chloride inputs to watersheds are most often from atmospheric deposition, road salt, or agricultural fertilizer, although studies on agricultur...

Journal: :Environmental management 2009
Jeffrey T Maxted Matthew W Diebel M Jake Vander Zanden

Agricultural non-point source (NPS) pollution poses a severe threat to water quality and aquatic ecosystems. In response, tremendous efforts have been directed toward reducing these pollution inputs by implementing agricultural conservation practices. Although conservation practices reduce pollution inputs from individual fields, scaling pollution control benefits up to the watershed level (i.e...

1999
Michael McAllister Jack Snoeyink

The Terrain Resources Inventory Mapping (TRIM) data standard in BC, Canada, includes speci cations for river data and elevation data that are typically met by interpretation of stereo orthophotos. It does not specify that breaklines for watersheds be interpreted from the photos, thus we must extract them from the data. We seek a system of watersheds that, while not exact due to errors in the da...

Journal: :Ringing & Migration 1985

Journal: :Journal of environmental quality 2004
R D Harmel H A Torbert B E Haggard R Haney M Dozier

When improperly managed, land application of animal manures can harm the environment; however, limited watershed-scale runoff water quality data are available to research and address this issue. The water quality impacts of conversion to poultry litter fertilization on cultivated and pasture watersheds in the Texas Blackland Prairie were evaluated in this three-year study. Edge-of-field N and P...

2016
Quenton M. Tuckett Peter Koetsier

Wildfire is an important and prevalent agent of disturbance in vegetated landscapes across much of the Earth’s surface, including forested watersheds in the arid western USA. Between 1992 and 2003, >40% of the watersheds in the upper reaches of the Boise River watershed in central Idaho burned. The purpose of our study was to investigate the legacy effects of wildfire on stream ecosystems by an...

Journal: :The American naturalist 2009
Kevin G McCracken Christopher P Barger Mariana Bulgarella Kevin P Johnson Mary K Kuhner Andrew V Moore Jeffrey L Peters Jorge Trucco Thomas H Valqui Kevin Winker Robert E Wilson

Hypoxia is one of the most important factors affecting survival at high altitude, and the major hemoglobin protein is a likely target of selection. We compared population genetic structure in the alphaA and betaA hemoglobin subunits (HBA2 and HBB) of five paired lowland and highland populations of Andean dabbling ducks to unlinked reference loci. In the hemoglobin genes, parallel amino acid rep...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید