Transport and reduction of nitrate in clayey till underneath forest and arable land

Concurrent nitrate and atrazine retention in bioreactors of straw and bark mulch at short hydraulic residence times

“…The herbicides did not interfere with microbiological NO 3 − reduction through the range of concentrations evaluated (data not shown). Jørgensen et al (2004) found in columns with till that was degraded to natural DOC that bentazone acted, on the contrary, as a source of organic carbon. in wood chips and did not observe negative effects on denitrification.…”

Modelling nitrate transport and turnover in a lowland catchment system

“…Subsoil denitrification is mainly driven by leaching of organic carbon from the topsoil and denitrification can be strongly limited according to studies by Brye et al (2001). Chemical transformation and sorption processes resulted in a constant decrease of instable organic matter with depth (Siemens et al, 2003;Jorgensen et al, 2004). It can therefore be assumed, that the vadose zone is of low importance for nutrient turnover and denitrification because of the low availability of organic matter.…”

Subsurface nitrate reduction under wetlands takes place in narrow superficial zones

“…In the latter case, electrons needed for nitrate reduction are originated from the oxidation of organic matter that also acts as a source of cellular carbon (heterotrophism). Illustrative, a stoichiometric reaction of a complete heterotrophic denitrification to nitrogen gas is presented in Equation 1 [5]. 5CH 2 O + 4NO 3 -→ 2N 2 + 4HCO 3 -+ 3H 2 O + CO 2…”