tailieunhanh - Báo cáo lâm nghiệp: "Architecture of root branches of Norway spruce trees (Picea abies [L.] Karst.) growing in gley soil"

Tham khảo luận văn - đề án 'báo cáo lâm nghiệp: "architecture of root branches of norway spruce trees (picea abies [l.] karst.) growing in gley soil"', luận văn - báo cáo phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | JOURNAL OF FOREST SCIENCE 54 2008 11 485-490 Architecture of root branches of Norway spruce trees Picea abies L. Karst. growing in gley soil P. Stofko1 M. Kodrík2 1National Forest Centre - Forest Research Institute Zvolen Slovakia Faculty of Forestry Technical University in Zvolen Zvolen Slovakia ABSTRACT In the locality Hnilé Blatá the High Tatras Mts. the structure was measured of root branches in the windthrown spruces Picea abies L. Karst. . After cleaning the root plates the number diameter and length of individual root branches were measured. Individual root branches were classified into twelve diameter classes - according to their diameters measured in the middle of the root branch length. We found out a high frequency of the root branches in the first three root-diameter classes the values of the average frequency of root branches smoothly declined with their diameters increasing. We found out the lowest mean values of the root branch length in the first two root diameter classes. However the values of total average length of root branches were the highest in the first root diameter class and these values continually decreased with increasing values of the root branch diameter. On the basis of the high values of root frequency and of total root length in the thinnest root-diameter classes it seems that the spruce trees growing in gley soil form a similar root structure as those growing in podzolic brown soil. Keywords Picea abies root branch gley soil The research into tree root systems is less frequent than the studies on the aboveground parts for various reasons. The root systems are not visible by the unaided eye and they are of lower economic importance than the aboveground biomass. The research into the tree root systems is also very labour-demanding and its methods are not developed as well as the procedures for the aboveground biomass inventory. The methods for the belowground biomass inventory have been comprehensively described by Kốstler et al. .