tailieunhanh - Báo cáo lâm nghiệp: "Different technologies of floodplain forest regeneration from the aspect of soil changes"

Tuyển tập những bài báo cáo nghiên cứu khoa học hay nhất được đăng trên tạp chí JOURNAL OF FOREST SCIENCE đề tài: Different technologies of floodplain forest regeneration from the aspect of soil changes. | JOURNAL OF FOREST SCIENCE 55 2009 8 357-367 Different technologies of floodplain forest regeneration from the aspect of soil changes N. Pernar1 E. Klimo2 S. Matic1 D. Baksic1 H. Lorencová2 1Faculty of Forestry University of Zagreb Zagreb Croatia Faculty of Forestry and Wood Technology Mendel University of Agriculture and Forestry in Brno Brno Czech Republic ABSTRACT Like in other types of forests the greatest changes in the soil of floodplain forest stands occur during their regeneration. These changes are manifested as changes in the content and dynamics of organic matter in the soil. Research was conducted in oak and ash floodplain forests in the eastern part of Croatia and in southern Moravia in the Czech Republic. The results showed that the type and extent of these changes depended in addition to environmental factors also on the technology of forest regeneration. The natural regeneration of oak in floodplain forests of Spacva eastern Croatia protects soil from dramatic changes in soil by successive regeneration felling and that it retains the plant cover permanently. The weight of organic matter on the soil surface is increased after regeneration till the period when the effect of thinning becomes evident about 70 years . In the surface mineral layer of soil the pH value increases after shelterwood felling. Stand regeneration with clear-cutting results in a rapid change in the conditions of surface humus accumulation and decomposition. The process of organic residue accumulation is interrupted in the clearings. In the preparation of soil site by ploughing the concentrations of nitrogen and carbon slightly decrease. The management impact depends on the method of site preparation for the establishment of a new stand. The selection of a method of the floodplain forest regeneration particularly of oak is markedly dependent on actual ecological conditions and on ecological and historical experience of the given region. Keywords floodplain forest regeneration soil