Studies on the role of improvement perimeters in preventing and combating soil erosion

Abstract

Work conducted over the course of a year have had as primary purpose the effect of ecological reconstruction through afforestation and other works (support fences, cross and longitudinal works în ravinees) in improvement perimeters Diviciori 1 (compartment 73) and Diviciori 3 (compartment 49). Forest vegetation was installed 30 years ago in 73, according to afforestation formula 7PiN-2Pa (Fr) -1 seadbucktorn and 50 years in 49, according to the afforestation formula: 5PiN-2Pi-3Mo. Stands were led using silvotechnic works were just regarding hygienization, in the first years. However, in the recent past, the trees have suffered due to abiotic factors that favorized the emergence of disease and pests (Lophodermium ssp. and Diprion pini). So as to obtain more relevant scientific data, test surfaces were placed following the methods used in the agricultural field, modified as to fit the forest field, so the data could be statistically processed and allow the recommendation of adequate technical solutions regarding the ecological reconstruction of the damaged terrains. Eight test areas were placed in the forests and limitrophe to them, the collected data concerning the volume of rainfall, the quantity of runoff on each surface, respectively material collected in the designated tanks. Therefore the collected data has been processed in the laboratory, ultimately uncovering the quantity of eroded material and comparing it between the two compartments and the limitrophe land, having the following values: 0.0912 t/ha in 49, 0.1718 t/ha outside 49, 0.0939 t/ha in 73 and 0.1657 outside 73. Keywords: Improvement perimeter, runoff plots, erosion, rainfall, forest bottom