Soil nitrogen accumulation, denitrification potential, and carbon source tracing in bioretention basins
نویسندگان
چکیده
Abstract Bioretention basins are one of the most commonly used green stormwater features, with potential to accumulate significant levels nitrogen (N) in their soil and permanently remove it through denitrification. Many studies have investigated N removal bioretention assessment inflow outflow concentrations. However, long-term accumulation denitrification is less known. This study temporal variation total (TN) soils 25 within a 13-year chronosequence, subtropical climate Australia. The subset seven was accompaniment nutrient characteristics. Additionally, stable isotopes (?13C ?15N) were assess changes composition as well identify sources carbon (C) into these basins. Over 13 years operation, TN accumulated faster top 5 cm than deeper soils. Soil density highest an average 1.4 kg m?3, which about two times higher Site age texture best predictors (1 9.7 mg m?2 h?1). isotope values variable among Low ?15N young (-1.02‰) suggested fixation main source N, while older had ?15N, indicating plants primary C; although occurrence amendment also contributed C pool. To improve performance basins, we recommend increasing vegetation at initial after construction, enhancing more frequent anaerobic conditions high profile. These can potential, thus for improving water quality.
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ژورنال
عنوان ژورنال: Water Research
سال: 2021
ISSN: ['0043-1354', '1879-2448']
DOI: https://doi.org/10.1016/j.watres.2020.116511