The effect of climate factors on the number and development of different aged youth of pure fir (abies nordmanniana subsp. Bornmülleriana mattf.) Forests of Bartin-kumluca region

Natural resources have been constantly destroyed from the time of mankind until the present day. This has led to gradual deterioration of the ecological balance. Particularly the benefits realized in order to meet the needs of energy, housing and nutrition have led to irreparable impairments in all natural resources and the structure of natural populations and gene frequency have changed in the negative direction. These negativities have also reduced the biological diversity of all living things. Today, the widespread industry and the environmental problems that arise in the face of the growing population have led to the end of the natural resources. In particular, with the emergence of climate change problems, it has become very difficult to ensure the sustainability of natural resources. Forests, one of the most important sources of nature from these negativities, have also been damaged. Ensuring the sustainability of forests is very important in terms of global warming and carbon emissions. For this reason, successful natural and artificial rejuvenation work is necessary in the forests. For this purpose, the natural structure of the forests, the developmental dynamics of the forests and especially the influence of the climate factors on young individuals need to be analyzed and evaluated very well. It is essential that any technical interventions to be carried out in the forests are dealt with in detail in terms of microecological conditions. For this purpose, changes in number of natural fox youth and their growth status were investigated in the fixed test sites of 10x25x40 m size between 2004 and 2017 on the stems of Abies nordmanniana subsp. bornmülleriana Mattf., Which is naturally found in the Bartın-Ardıç region. As a result of these examinations, it was determined that the average number of youth per square meter between 2004 and 2017 showed a significant decreasing trend, ranging from 286.7 to 36.4. On the other hand, between the same years, it has been determined that the mean height growth of the fir juvenilities changes between 1.2-83.6 cm in normal closure conditions and shows trend. In addition, it has been determined that the root collar diameter measurements made on natural juvenilities in the sample plots showntrend between 1.3-18.7 mm. The standardized rainfall-evapotranspiration index (SPEI) was used to determine how the juvenilities affected the climate conditions in the study. As a result of the climate analysis, it has been found that the number of natural fir juvenilities and their growth performance are significantly affected negatively from the drought periods in the region and they are far below the normal performance level when growing in these periods. However, the drought periods between 2004 and 2017 have also significantly delayed the maturation of the stand.