tailieunhanh - Báo cáo lâm nghiệp: "Phenology of four broad-leaved forest trees in a submountain beech forest"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Phenology of four broad-leaved forest trees in a submountain beech forest. | JOURNAL OF FOREST SCIENCE 55 2009 1 15-22 Phenology of four broad-leaved forest trees in a submountain beech forest B. Schieber1 R. Janik1 Z. Snopková2 1 Institute of Forest Ecology Slovak Academy of Sciences Zvolen Slovakia Slovak Hydrometeorological Institute Regional Centre Banská Bystrica Slovakia ABSTRACT The phenology of four deciduous forest tree species Carpinus betulus L. Fagus sylvatica L. Quercus dalechampii Ten. Tilia cordata Mill. was studied in a submountain beech forest stand in Central Slovakia. Two spring phenological phases - bud-burst and leaf unfolding as well as one autumn phase - autumn leaf colouring were monitored over the period of 13 years. The results documented interannual variability in the dating of phenological phases within the species while the differences among the species were also revealed. Significant correlations P were detected between the dating of leaf unfolding and air temperature the coefficients of correlation r ranged from hornbeam and beech to oak . Significant relationships were also revealed between cumulative precipitation amounts and timing of autumn leaf colouring phase r-value ranged from in oak to in hornbeam . The trend analysis showed that the onset of phenological phases was slightly shifted to the earlier dates during the period of 13 years. However the trends were not statistically significant. Keywords submountain beech forest phenology vegetative phenological phases air temperature precipitation Four autochthonous broad-leaved tree species European beech oak hornbeam and lime-tree take up approximately 50 of the forest stand area of the Slovakia Collective 1998 . Excepting hornbeam these tree species belong to woody plants subjected to phenological monitoring in the framework of the International Phenological Gardens Program Chmielewski 1996 . The climatological monitoring which is coordinated by the Slovak Hydrometeorological Institute SHMI also includes phenological .