TAILIEUCHUNG - Báo cáo lâm nghiệp: " Comparison of deposition fluxes on the open area and in mountain spruce stands of different density"

Tuyển tập những bài báo cáo nghiên cứu khoa học hay nhất được đăng trên tạp chí JOURNAL OF FOREST SCIENCE đề tài: Comparison of deposition fluxes on the open area and in mountain spruce stands of different density. | JOURNAL OF FOREST SCIENCE 55 2009 9 395-402 Comparison of deposition fluxes on the open area and in mountain spruce stands of different density I. Marková I. Drápelová S. Truparová Faculty of Forestry and Wood Technology Mendel University of Agriculture and Forestry in Brno Brno Czech Republic ABSTRACT To better understand the chemical transformation of rainfall after the passage through the canopies it is necessary to study throughfall deposition fluxes within forest stands. The comparison of bulk deposition fluxes of Ca Mg K S-SO4 N-NO3 and N-NH4 in mountain spruce stands of different stand density and bulk deposition fluxes on the open area was made at the study site Bílý Krlz Moravian-Silesian Beskids Mts. Czech Republic during the period of 1999-2006. A linear relationship between the amount of rainfall on the open area and the amount of throughfall in the spruce stand was found. Throughfall deposition fluxes of selected elements in the dense as well as in the sparse spruce stands were higher when compared with bulk deposition fluxes on the open area. There were mostly statistical significant differences between the bulk deposition fluxes on the open area and those in the studied spruce stands. The throughfall deposition fluxes of Ca Mg K and S-SO4 were influenced by the spruce stand density. Keywords throughfall Norway spruce Moravian-Silesian Beskids Mts. Czech Republic Forest ecosystems are open systems exchanging energy and matters with its environment. The maintenance of a relatively closed matter cycle is necessary for the prosperous development of forest ecosystems. Due to changes caused by anthropogenic activity the composition of the atmosphere is changing and will continue to change. The changes in the atmosphere are reflected in the functioning and growth of forests. The loss of vitality is related to nutritional imbalances and brings about reduced stand stability and productivity Rehfuess 1985 Zech et al. 1985 Ulrich 1986 Zottl Huttl 1986 . The .

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