细化搜索
结果 1-2 的 2
Effect of thinnings of air-polluted Norway spruce stands in the Czech Republic
2002
Slodicak, M. | Novak, J. (Forestry and Game Management Research Institute, Opocno (Czech Republic))
The aim of the experiment was to find out the influence of various thinning regimes on health condition of young stands of Norway spruce under the stress of air pollution. The experiment is based on comparative method. The series consists of three comparative plots with different thinning regimes. The comparative plot 1 is a control plot without thinning. The program with heavy thinning from below has been tested on the plot 2 and the program based on one very heavy thinning in the young age and longer periods was applied in the stands of plots 3. Health condition of experimental stands was assessed on defoliation in 1982, 1981 and since 1987 annually on both series
显示更多 [+] 显示较少 [-]Throughfall of plant nutrients in relation to crown thinning in a Swedish coniferous forest
1988
Alenaas, I. (Swedish Environmental Research Inst., Gothenburg (Sweden)) | Skaarby, L.
