Effects of timber cutting on forest floor, sediment movement, and chemical quality of percolating water and of plot runoff are reported for pole‐size loblolly pine (Pinus taeda L.) plantations on fragile soils of the upper Coastal Plain. Treatments were clearcut, thin, and nocut. Water quality measurements were derived for runoff samples from 0.002‐ha plots and for percolating water from zero‐tension lysimeters at a 15‐cm depth. Forest floor on clearcut plots was reduced to near the minimum regarded as necessary for site protection within two years. Regardless of cutting treatment, more N and P were coming into the plots via precipitation than were leaving via plot runoff and percolation combined. More K appeared to be leaving the sites than was coming in via rainfall, regardless of cutting treatment. Sediment concentrations in plot runoff tended to be proportional to cutting intensity. Nutrient content in percolation waters was unrelated to cutting intensity. Nutrient concentrations in plot runoff were high compared to concentrations reported in stormflows from local, small catchments with similar characteristics, but plot runoff was <3% of annual rainfall.
The effect of clearcutting loblolly pine (Pinus taeda L.) on concentrations of sediment and nutrients in stormflows was studied on small catchments near Lexington, TN. The plantations were established on eroded and abandoned agricultural lands with fragile soils. Soil series on the catchments include Lexington silt loam (fine‐silty, mixed, thermic Typic Paleudalfs), Providence sill loam (fine‐silty, mixed, thermic Typic Fragiudalfs) and Ruston sandy loam (fine‐loamy, silicious, thermic Typic Paleudults). Eight catchments (0.17–0.56 ha) were instrumented with flumes equipped with water stage recorders to measure stormflow and Coshocton wheel samplers to obtain integrated samples of the flow. Plantations on four catchments were clearcut; the other four were left as uncut controls. Stormflow samples were analyzed for sediment‐phase total Kjeldahl nitrogen (TKN) and total phosphorus (TP) and solution‐phase TKN, TP, and potassium (K). Results indicated that a third or more of the TKN and two‐thirds of the TP exported in stormflow from the catchments was via sediment. Solution‐phase TKN and TP concentrations in stormflow were similar on clearcut and control catchments. Solution K concentrations were consistently higher from clearcut catchments. Rainfall inputs of TKN, TP, and K exceeded stormflow losses. The study demonstrated that pine plantations established on fragile soils can be clearcut without significant impact on water quality if recommended practices are used.
A b s t r a c tThe Congressional Papers Roundtable (CPR) has pursued an active agenda for the past twenty-five years. It also has produced many SAA leaders. The community, advocacy, and productivity found in roundtables make them ideal breeding grounds for leadership. What roles have roundtables played in archivists' development and within SAA? How will social networking affect those roles? How can we continue to generate new ideas and opportunities? Panelists examined these issues, reflected on the future, and emphasized lessons learned.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.