Filters: Tags: denitrification (X)246 results (159ms)
To determine the dominant processes controlling nitrogen (N) dynamics in soils and increase insights into soil N cycling from nitrogen isotope (?15N) data, patterns of 15N enrichment in soil profiles were compiled from studies on tropical, temperate, and boreal systems. The maximum 15N enrichment between litter and deeper soil layers varied strongly with mycorrhizal fungal association, averaging 9.6 � 0.4? in ectomycorrhizal systems and 4.6 � 0.5? in arbuscular mycorrhizal systems. The 15N enrichment varied little with mean annual temperature, precipitation, or nitrification rates. One main factor controlling 15N in soil profiles, fractionation against 15N during N transfer by mycorrhizal fungi to host plants, leads...
Groundwater pollution by nitrates in a heterogeneous agricultural watershed. II. Evolution of concentrations in the aquifer
Effect of temperature, oxygen, salinity, and nutrient enrichment on estuarine denitrification rates measured with a modified nitrogen gas flux technique
Denitrification is a critical process regulating the removal of bioavailable nitrogen (N) from natural and human-altered systems. While it has been extensively studied in terrestrial, freshwater, and marine systems, there has been limited communication among denitrification scientists working in these individual systems. Here, we compare rates of denitrification and controlling factors across a range of ecosystem types. We suggest that terrestrial, freshwater, and marine systems in which denitrification occurs can be organized along a continuum ranging from (1) those in which nitrification and denitrification are tightly coupled in space and time to (2) those in which nitrate production and denitrification are relatively...
Nitrogen transformations in oil-contaminated, bioremediated, solvent-extracted and uncontaminated soils
Nitrate removal in riparian wetland soils: Effects of flow rate, temperature, nitrate concentration and soil depth
Treatment of raw sewage in a temperate climate using a UASB reactor and the hanging sponge cubes process
Nitrogen fixation and denitrification rates of sediments in some Amazonian aquatic ecosystems during the filling period