Soil Property Control of Biogeochemical Processes beneath Two Subtropical Stormwater Infiltration Basins

Substantially different biogeochemical processes affecting nitrogen fate and transport were observed beneath two stormwater infiltration basins in north-central Florida. Differences are related to soil textural properties that deeply link hydroclimatic conditions with soil moisture variations in a humid, subtropical climate. During 2008, shallow groundwater beneath the basin with predominantly clayey soils (median, 41% silt+clay) exhibited decreases in dissolved oxygen from 3.8 to 0.1 mg L⁻¹ and decreases in nitrate nitrogen (NO₃⁻–N) from 2.7 mg L⁻¹ to