Soil erosion - runoff plots 2007-2009

In 2007-2009, soil erosion were measured using standard USLE plots (22.1 m long and 2 m wide) in 5 locations in Poland: 1 – Udziejek (Suwałki Lakeland, Polska NE), 2 – Storkowo (Drawskie Lakeland, Polska NW), 3 – Bogucin (Nałęczów Plateau, Polska SE), 4 – Guciów (Middle Roztocze, Polska SE), 5 - Łazy (Wiśnicz Foothils, Polska S).The measurements included: rainfall (P, mm), rainfall erosivity index (EI30, MJ mm ha-1 h-1), soil loss (SL, kg m-2) and runoff (mm) from plots with: bare fallow, cereals and root crops and, in two locations with grass. Plots were separated from the rest of the field and from each other by PCV borders. Surface runoff with eroded sediment was collected in tanks. The volume of water was measured, the selected sediment was dried and weighed. The amount of water and sediment was related to the unit area. Rainfall parameters were registered by automatic gauges located near the plots. Erosive rainfall events were identified using the USLE criterion (Wischmeier, Smith 1978). For rainfall events, kinetic energy Ekin was calculated according to the formula developed by Brown and Foster (1986) and then its EI30 index was calculated. Each row contains the measurement location, measurement date, rainfall depth, soil loss and runoff. For winter measurements, 1/10 of the combined rainfall and snowfall was considered as rainfall-runoff R-index. Measurements were taken after heavy rainfall or at least once a month. If the measurement period included more than one rainfall, the sum of rainfall was related to the sum of its erosivity. The measurements were listed by the dates they were taken.