tailieunhanh - Báo cáo lâm nghiệp: " Humus conditions and stand characteristics of artificially established young stands in the process of the transformation of spruce monocultures"

Tuyển tập những bài báo cáo nghiên cứu khoa học hay nhất được đăng trên tạp chí JOURNAL OF FOREST SCIENCE đề tài: Humus conditions and stand characteristics of artificially established young stands in the process of the transformation of spruce monocultures. | JOURNAL OF FOREST SCIENCE 55 2009 5 215-223 Humus conditions and stand characteristics of artificially established young stands in the process of the transformation of spruce monocultures L. Menốík1 T. Fabianek1 V. Tesar2 J. Kulhavý1 1 Institute of Forest Ecology Faculty of Forestry and Wood Technology Mendel University of Agriculture and Forestry in Brno Brno Czech Republic Department of Forest Establishment and Silviculture Faculty of Forestry and Wood Technology Mendel University of Agriculture and Forestry in Brno Brno Czech Republic ABSTRACT The main reason for the transformation of spruce monocultures at sites of mixed broadleaved forests is to create more natural relationships between the species structure of a stand and soil processes. The presented study compares humus conditions and basic growth characteristics of two mixed stands spruce with beech and larch with beech aged 25 years with a beech stand aged 40 years and spruce stand aged 30 years . The purpose of the study is to evaluate i forms of forest floor ii soil reaction iii the content and total reserves of carbon nitrogen and C N ratio iv dissolved organic carbon DOC in relation to stand characteristics. The highest reserve of forest floor is detected in the mixed stand of larch with beech t ha the lowest reserve in a beech stand t ha . The soil reaction of the spruce stand and the beech stand is and respectively. The C N ratio of the spruce stand is and that of the beech stand . The DOC content decreases with layers of surface humus towards depth. Mixed stands represent by their values of soil conditions a mean between spruce and beech stands. Keywords tree species composition soil forest floor reserves and forms pH C N ratio DOC forest stand characteristics Problems of spruce monocultures refer seriously to more European countries particularly with respect to the new orientation of management and using forest ecosystems. In the Central European region .