Đang chuẩn bị liên kết để tải về tài liệu:
Báo cáo lâm nghiệp: "Evaluation of the growth and health status of selected clone mixtures in comparison with ordinary planting stock"

Tuyển tập những bài báo cáo nghiên cứu khoa học hay nhất được đăng trên tạp chí JOURNAL OF FOREST SCIENCE đề tài: Evaluation of the growth and health status of selected clone mixtures in comparison with ordinary planting stock. | JOURNAL OF FOREST SCIENCE 56 2010 7 314-322 Evaluation of the growth and health status of selected clone mixtures in comparison with ordinary planting stock J. Leugner a. Jurasek J. Martincová Forestry and Game Management Research Institute Opocno Research Station Opocno Czech Republic ABSTRACT The present paper compares the growth of parent trees and potentially stress-tolerant mixtures of clones of Norway spruce Picea abies L. Karst. progenies coming from a specific locality near the Cerna hora peat bog in the Krkonose Mts. Growth was studied in generative ortet plantations in Trutnov locality and in a mountain ortet plantation Lesní bouda in the 1st generation clone plantation Benecko and in the 2nd generation clone plantation in the Cernohorská raselina locality. In the latter locality chlorophyll fluorescence and water losses during controlled desiccation were also measured in selected clones compared to control generatively propagated spruces. Partial data acquired until now prove the good growth dynamics and physiological state of some clones in extreme climatic conditions indicating that cuttings were taken from vital parent trees growing in exposed mountain localities. Growth relations among the clones were identical in all evaluated localities. The growth of the 2nd generation clone plantation has been markedly influenced by plantation and specific site conditions until now. The mutual interaction of clone growth and site conditions can change in time and therefore the study of clone plantations will continue in the years to come. Keywords chlorophyll fluorescence clonal propagation growth mother plantations mountain conditions Norway spruce water losses Stabilization of forest functions is the main objective of the present forest management in mountain areas. Norway spruce Picea abies L. Karst. has an irreplaceable stand-forming function in forest ecosystems at higher mountain locations therefore it is desirable to assess real potentials of this tree .