Occurrence of surface runoff from Georgia Piedmont planted and mature forests
Schneier, Joan Victoria
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This study evaluated overland flow exiting two clearcut, bedded, and planted areas plus an uncut reference area. Runoff cups were established at 30 m intervals along the boundary of streamside management zones (SMZs). Absence or presence of runoff was tallied for events exceeding 13 mm and concentrated flow tracks (CFTs) were grab sampled during large storms. Mean runoff cup response was 9.7% from the plantations and 2.2% for the reference. Cup responsiveness and bare ground decreased from the first to the second year after planting. Response frequency was best correlated to rainfall factors R from the Revised Universal Soil Loss Equation, total storm depth, and 24-hour and 6-hour maximum intensities. Runoff locations were well distributed and some CFTs fully penetrated the SMZ. Mean plantation concentrations of dissolved nitrates, dissolved phosphates and suspended solids were 2.1, 0.21, 54 mg/L the first year, and 0.1, 0.12, 36 mg/L the second year, respectively.