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The volume of incidental wood products due to the catastrophic windfalls that occurred on the 17th of September 2017 was estimated, at national level at 460 thousand m3, of which over 200 thousand m3 were registered in the area administered by the Bihor County Forest Administration. The main objective of this paper is the study of the changes that appear in the micro-relief and of the influence of some environmental characteristics, in the beech stands (Fagus sylvatica L.) from the Forest District Sudrigiu, Management Unit U.P. VII Văratec, Bihor County Forest Administration, Romania, as an effect of windfalls. The field observations had the purpose of: determining the displaced volume (DV); breast height diameter (D1.3); height of tree (HT); average root diameter (ARD); age (A); depth of micro-depression (DM) and depth of rock / parent material (DRP). Bifactorial linear regression of the DV according to the two characteristics of the tree (D1.3) and the soil (DRP) allows an assessment of the volume of displaced soil with an accuracy of 95%. The volume of soil dislocated in the beech stands (Fagus sylvatica L.) from the Forest District Sudrigiu, Management Unit U.P. VII Văratec, Bihor County Forest Administration, Romania, evaluated with the help of the two-factor linear regression based on the basic diameter of tree D1.3 and the depth of the rock / parent material DRP and respectively the number of felled trees is between 2589.89 m3 for u.a. 100 A, partially affected and 13694.46 m3 for u.a. 104 A, affected by mass felling. To acknowledge the total volume of dislocated land and of the specific volume (m3/ ha), for the different compartments, is important for the analysis and differentiation of the variants of works necessary for the forest reconstruction of the lands affected by windfalls.

ABSTRACT The objective of this study was to identify eucalyptus clones for the production of sawed timber based on dendrometric variables and longitudinal residual deformation (LRD), analyzing the correlation between these characteristics. 20 Eucalyptus grandis x Eucalyptus urophylla clones with 13 years of age were analyzed. The crown size, diameter at breast height (DBH) and bark thickness were measured. There was a significant difference between the clones for DBH, LRD and bark thickness. There was no significant correlation between DBH and DRL. The correlation was significant between DBH and crown size, its being possible to affirm that crown size affects the diametrical growth of trees. DBH and bark thickness were also significantly correlated, in so far as trees with a wider diameter possess thicker bark. It was possible to select clones with better potential for sawed timber production, that is to say, elevated DBH with a reduced LRD.

The aim of the study was to determine whether there is a correlation between breast height diameter, tree height and stem total volume of Scots pines, on the one hand, and volume and proportion of juvenile wood, on the other. The investigations comprised pure pine stands of the IInd, IIIrd, IVth and Vth age classes developed in conditions of fresh mixed coniferous forest. A distinct curvilinear correlation was found between volume and proportion of juvenile wood in tree stems and breast height diameter, height and stem total volume. Because of high values of determination coefficients (R2), which characterised the above-mentioned correlations, it seems appropriate to use these regularities to assess the quality of the timber raw material regarding the proportions of its volume and juvenile wood in stems of Scots pine trees.

Vegetation in the northwestern mountainous region of Guangdong Province, China is a mosaic of forests and shrubs. Shrubs in this area are evergreen with heights <2.5 m and have been left unused for at least 50 years. Recently, light grazing by a local breed of goats was started in a mountainous region near Lechang City under local government guidance. We conducted a survey over 4 years to estimate plant mass as a feed resource for goats in a sharply undulating mountainous shrubland. Two permanent plots (50 × 50 m) were set in a 76-ha site; shrub-dominated downward slopes and valleys (S plot), and a mountain ridge and an adjacent slope dominated by herbaceous species on slightly poorer soil (G plot). The plant mass, including herbaceous plants, and leaf and xylem parts of shrubs, which were determined through allometric equations based on measurements of breast height diameter of shrubs, was estimated at 15.9 t dry matter (DM) ha−1 in the S plot and 7.7 t DM ha−1 in the G plot. The total mass of herbaceous plants and shrub leaves, available to grazing goats, was estimated at 3.9 and 3.1 t DM ha−1 in the S plot and G plot, respectively. We conclude that 4.9 adults and 2.4 kids ha−1 can be stocked throughout a year on this mountainous shrubland. [ABSTRACT FROM AUTHOR]