Turkish Journal of Forestry

11-17

Authors: Esra BAYAR, Onur ALKAN

This study was carried out to evaluate the influence of thinning on natural Brutian pine (Pinus brutia Ten.) stands in Isparta/Sütçüler Forestry Management Directorate. The effect of the four-year results of thinning on the growth characteristics of Brutian pine stands was evaluated at two different levels applied in two different areas at similar elevation. Moderate thinning was performed in area I, and heavy thinning was performed in area II. Thinning applied in Brutian pine stands in both areas had an effect on mean diameter at breast height, tree height, tree stability and total basal area. Tree stability, diameter and height growth of trees increased with the thinnings applied. At the end of four years, no significant difference was determined between the areas where thinnings was applied and the control areas in terms of the total volume per hectare in both areas. As a result, heavy thinning may be preferred as the first thinning in areas where regular maintenance is applied in natural Brutian pine stands. In areas where regular maintenance is not applied, moderate thinning can be applied considering the development of the stand.

25-38

Authors: İbrahim DURSUN, Ahmet Alper BABALIK

The research was carried out to determine the morphometric analysis parameters of the Burdur Lake Watershed. In addition, the erosion situation in the watershed has been evaluated with the help of morphometric parameters. The data basis of the research was created using the Digital Elevation Model (DEM) obtained from Shuttle Radar Topography Mission (SRTM). The determination of the stream indexes used in the analyzes was made via the ArcGIS 10.2 program. In this context; When the morphometric analysis results of the parameters of the linear, areal and relief morphometries of the watershed are examined; bifurcation ratio 3.42, stream length ratio 3.46, drainage density 1.25, stream frequency 0.95, form factor 0.25, gravelius index 2.66, circularity ratio 0.14, elongation ratio 0.28, basin relief 1534, relief ratio 0.013, relative relief 0.29, ruggedness number respectively 1.92 and the hypsometric integral value was found to be 0.28. In general, it has been found that the infiltration capacity of the watershed is high, stream frequency and flood sensitivity are low. In consequence of morphometric analysis, it was determined that the area had arid climatic conditions and weak vegetation. As a result, it has been concluded that the erosion risk is relatively low in most of morphometry parameters. According to these results, it can be said that morphometric analysis are an important tool for interpreting the erosion situation in the watershed.