tailieunhanh - Báo cáo lâm nghiệp: "Sulphur and nitrogen concentrations and fluxes in bulk precipitation and throughfall in the mountain and highland spruce stands in the Czech Republic"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Sulphur and nitrogen concentrations and fluxes in bulk precipitation and throughfall in the mountain and highland spruce stands in the Czech Republic. | JOURNAL OF FOREST SCIENCE 56 2010 10 429-441 Sulphur and nitrogen concentrations and fluxes in bulk precipitation and throughfall in the mountain and highland spruce stands in the Czech Republic I. Drápelová L. Mensik J. Kulhavý I. Markova Institute of Forest Ecology Mendel University in Brno Brno Czech Republic ABSTRACT Concentrations and fluxes of sulphur and nitrogen compounds in bulk precipitation and in throughfall were evaluated and compared for two experimental sites in the Czech Republic one situated at Rájec Drahanská upland 610 m . and the second one at Bílý Kriz Moravian-Silesian Beskids 908 m . both with similar stands of young Norway spruce. The three-year study performed during 2006-2008 revealed statistically significant differences in nitrate nitrogen concentrations in bulk precipitations and in ammonium nitrogen concentrations both in bulk precipitation and in throughfall between the two sites. Higher nitrogen compounds concentrations in bulk precipitation were found at Rájec. Differences between the two sites in sulphur concentrations were not found out neither in bulk precipitation nor in throughfall waters. Total sulphur deposition amounted to and kg S-ha-1 at Rájec and to and kg S-ha-1 at Beskids for the three years studied respectively. Total inorganic nitrogen throughfall flux amounted to and at Rájec and and kg-ha-1 at Bílý Kriz for the years 2006 2007 and 2008 respectively. Keywords Bílý Kriz Moravian-Silesian Beskids Mts. Czech Republic nitrogen deposition rainfall Rájec Drahanská Highland sulphur deposition throughfall From the second half of the 20th century large-scale forest decay has been observed in many places of central Europe. Acid atmospheric precipitation destabilized the ecological site valence mainly of allochthonous spruce monocultures. The acidification shows a number of negative consequences for forest ecosystems - qualitative and quantitative changes in .