Linking denitrification and infiltration rates during managed groundwater recharge.

摘要: We quantify relations between rates of in situ denitrification and saturated infiltration through shallow, sandy soils during managed groundwater recharge. used thermal methods to determine time series point-specific flow rates, chemical isotopic assess progress. Zero order 3 300 μmol L � 1 d were measured infiltration. Denitrifica- tion was not detected at times locations where the infiltra- rate exceeded a threshold 0.7 ( 0.2 m . Pore water profilesofoxygenandnitrateconcentrationindicatedadeepen- ing redoxocline high which reduced thickness zone favorable for denitrification. positivelycorrelated with below threshold, suggesting that given set sediment characteristics, there is an optimal achievingmaximumnitrateloadreductionandimprovementstowatersupplyduringmanagedgroundwaterrecharge.Theextentto results from this study may be extended other natural hydrologic settings remains determined, but approach taken should broadly applicable, provides quantitative link shallow biogeochemical processes.