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Ground water processes affecting seasonal variations of surface water nitrate concentrations were investigated in an incised first-order stream in an agricultural watershed with a riparian forest in the coastal plain of Maryland. Aquifer characteristics including sediment stratigraphy, geochemistry, and hydraulic properties were examined in combination with chemical and isotopic analyses of ground water, macropore discharge, and stream water. The ground water flow system exhibits vertical stratification of hydraulic properties and redox conditions, with sub-horizontal boundaries that extend beneath the field and adjacent riparian forest. Below the minimum water table position, ground water age gradients indicate...
Categories: Publication;
Types: Citation;
Tags: Agriculture,
Environmental Monitoring,
Fertilizers,
G
The sources of nitrate (NO3−) in groundwater of the shallow karst aquifer in southwestern Illinois' sinkhole plain were investigated using chemical and isotopic techniques. The groundwater in this aquifer is an important source of potable water for about half of the residents of the sinkhole plain area. Previous work has shown that groundwater from approximately 18% of the wells in the sinkhole plain has NO3− concentrations in excess of the USEPA's drinking water standard of 10 mg N/l. Relative to background levels, the NO3− concentrations in water from 52% of the wells, and probably all of the springs in the study area, are anomalously high, suggesting that sources other than naturally occurring soil organic matter...
Categories: Publication;
Types: Citation;
Tags: Data Visualization & Tools,
Fertilizers,
Groundwater,
Groundwater chemistry,
Karst springs,
Categories: Publication;
Types: Citation;
Tags: Data Visualization & Tools,
Landscapes,
Northeast CASC,
Other Landscapes,
Science Tools For Managers,
Many Army land managers find stabilization, rehabilitation, and revegetation extremely difficult on disturbed lands in arid and semi-arid regions. Blackbrush, Coleogyne ramosissima, occurs as a landscape dominant in the ecotonal region between hot and cold deserts of the western United States. Soils in this region are often characterized by well-developed microbiotic soil crusts. Revegetation efforts using blackbrush have met with limited success, prompting speculation on possible interactions with soil microorganisms, including mycorrhizal fungi. A series of experiments conducted from 1993 to 1997 tested the effect of inoculation with arbuscular mycorrhizal fungi on the growth of young blackbrush seedlings under...
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