tailieunhanh - Báo cáo lâm nghiệp: " Natural forest regeneration in spruce monocultures in the Ukrainian Beskids – prognosis by FORKOME model"

Tuyển tập những bài báo cáo nghiên cứu khoa học hay nhất được đăng trên tạp chí JOURNAL OF FOREST SCIENCE đề tài: Natural forest regeneration in spruce monocultures in the Ukrainian Beskids – prognosis by FORKOME model. | JOURNAL OF FOREST SCIENCE 53 2007 4 162-169 Natural forest regeneration in spruce monocultures in the Ukrainian Beskids - prognosis by FORKOME model I. Kozak V. Parpan G. Potaczala H. Kozak a. Zawadzki Department of Landscape Ecology Faculty of Mathematics and Natural Sciences Catholic University in Lublin Lublin Poland ABSTRACT This paper presents the results of investigations on natural forest regeneration in Norway spruce Picea abies L. Karst. monocultures in the Ukrainian Beskids with the use of FORKOME model prognostic possibilities. Different variants of regeneration methods are presented. Selective cutting with planting was determined as the most effective spruce selective cutting with simultaneous planting of target species beech Fagus sylvatica L. and fir Abies alba Mill. with admixture of ash Fraxinus excelsior L. . Beech and fir biomass increases rapidly over the first 20 years - then it stabilizes. After another 20-30 years the initial form of beech forest is recognizable and it is possible to speak about an increase of beech forest which in the course of time achieves a higher degree of similarity to natural stand. In the Ukrainian Beskids the potential forest stand consists of beech and fir Dentario glandulosae-Fagetum . Keywords Norway spruce beech computer model FORKOME Ukrainian Beskids spruce monocultures forest management Extensive Norway spruce Picea abies L. Karst. growing has been a characteristic method of forest management for Central Europe over the last two centuries. Norway spruce monocultures take up considerable areas in the Ukrainian Carpathians and in the Beskids. According to Golubets 1978 their area increased during two centuries from initial 126 thousand hectares to 325 thousand hectares presently. Health and density of these forests are far from being satisfactory. The spruce increased proportion does not reflect the potential vegetation schemes in the Beskids. There arises a problem of natural forest regeneration in the spruce .