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

Erosion caused by human activities is one of the reasons for forest soil degradation worldwide, with a direct impact on forest stands development, including reduced forest productivity. Therefore, in order to establish sustainable stand management practices, it is essential to assess soil losses in various forestry activities. Moreover, this phenomenon is studied little in stands, especially those established on degraded land. In Romanian geographical conditions, where sloping land is up to 67% of the territory and is influenced by natural factors as well as intense human activities, the soil and vegetation suffer serious ecological imbalances. In order to achieve the proposed objectives regarding the evaluation of stands in terms of anti-erosion effectiveness, we analyzed the consistency and the number of trees on the surface, the weight of the seedlings, and the surface runoff from the perspectives of rainfall and soil retention. In the two stands included in this study, the influence of rain intensity was 39% in compartment 49 and 38% in compartment 73, directly influencing surface runoff. The ground retention’s influence on surface runoff was 28% in both compartments. The indirect surface runoff was influenced by the consistency of the stands and by the degree of proximity of the crowns, which directly influenced the intensity of rain. In addition to analyzing these two parameters (rain intensity and ground retention), it was also observed that the degree of proximity to the crowns directly influenced the intensity of the rainfall within the forest, which, in turn, indirectly affected the runoff.

Background: The naturally present erosion phenomenon has been active throughout the geological eras, shaping the land surface to date. Today, this phenomenon causes significant damage to the environment and human activities.In the geographical conditions of Romania, where the sloping land represents up to 67% of the national territory and supported by a complex number of natural factors, as well as the intense human interventions from the end of the 19th century and the beginning of the 20th, the vegetation and soils face serious ecological imbalances. The afforestation of degraded lands gained momentum after 1948, and the most used species were pines, especially black pine and Scots pine.Methods: In order to achieve the proposed objectives regarding the evaluation of stands in terms of anti-erosion effectiveness, were analyzed the consistency of trees, the number of trees on the surface, the weight of the seedlings, and surface runoff, from the perspective of rainfall and soil retention.Results: Analyzing the influence of rain intensity, respectively 39% in compartment 49, 38% in 73 and ground retention on surface runoff, being 28% in both compartments, it results that the two parameters directly influence surface runoff. Thus, it can be stated that indirectly surface runoff is influenced by the consistency of the stands, by the degree of proximity of the crowns, which directly influence the intensity of rain and the number of trees and the vegetation that grows under them directly influences the retention in the soil through the litter that is formed, which promotes retention.Conclusions: The results obtained suggest that indirectly surface runoff is influenced by the consistency of the tree, by the degree of proximity of the crowns, which directly influence the intensity of rain.Also, the number of trees and the vegetation that grows under them directly influences the retention in the soil through the litter that is formed, which promotes retention and by creating areas that reduce the speed of water, favoring infiltration into the soil.

The introduction of some agricultural land which has partially or totally lost their production capacity is and will be a very important action of Romanian forestry. This extends the forest fund and improves the climatic conditions around the planting areas. The research was carried out in two improvement perimeters near Diviciorii Mari, which assumed measurements of tree diameters, heights and harvesting increment cores. After the analysis of the data and increment cores, the results were associated with climatic data and the stands were found to sufferfrom the effects of prolonged droughts. Also, these trees suffer from drying, windfalls and breaks of crowns due to the combination of droughts with slope and soil. The results obtained from the research were compared with the researches carried out at the Mineci-Ungureni Forest District between 1944 and 1955 and similarities were found regarding the influence of droughts on the radial and, implicitly, forest growths.

The objective of the research was to identify agricultural hydro-ameliorative works located in Aghireşu, the area covered by the Nadăş hydrographic basin considering for scientific purpose and economic importance. The studied area is part of the south-west of Someş Plateau and is important for the local community and also for neighboring areas. The influence of the environmental factors, on the basic conditions, for the cultivation and the development of the agricultural crops has a very important role. Land reclamation works applied on agricultural land in the hydrographic basin from the studied area have been over the years measures that have helped to remove the negative consequences on agriculture. Excess of humidity manifested in different forms had a particular impact onagrari soil fertility and hydro-ameliorative works have determined use of abandoned land.