Tag Archives: height growth

853–861 U. Neimane, J. Katrevics, L. Sisenis, M. Purins, S. Luguza2 and A. Adamovics
Intra-annual dynamics of height growth of Norway spruce in Latvia
Abstract |
Full text PDF (407 kB)

Intra-annual dynamics of height growth of Norway spruce in Latvia

U. Neimane¹*, J. Katrevics¹, L. Sisenis², M. Purins¹, S. Luguza2 and A. Adamovics¹

¹Latvian State Forest Institute ‘Silava’, Rigas 111, LV 2169 Salaspils, Latvia
²Latvia University of Agriculture, Forest Faculty, Akademijas 11, LV 3001 Jelgava, Latvia
*Correspondence: una.neimane@silava.lv

Abstract:

 Norway spruce (Picea abies (L.) Karst.) is a tree species with the highest economic importance in northern Europe. Therefore, it is important to improve knowledge of the potential effects of climatic changes on the growth of this tree species. An essential part of the information is the tree’s intra-annual growth cycle. There are comprehensive studies describing the formation of radial increments of coniferous trees; however, information on height growth in hemiboreal forests is scarce. The aim of our study was to characterize the intra-annual height growth of Norway spruce in Latvia. The data was collected from two Norway spruce trials located in in former arable and forest land in the central part of Latvia, including 89 and 68 open-pollinated families (respectively) of plus-trees. Weekly height increment measurements of 20 trees per family were carried out during the 9th growing season. Growth intensity culminated in 10 ± 0.2 mm day-1, following similar trend, but resulting consistently in significantly different values between the trials; the higher growth intensity was observed in higher trees and families, which also showed higher frequency of lammas shoots, boosting their height superiority even further. Significant family effect on all coefficients of shoot elongation curves, described by Gompertz model, was found. Both tree height and height increment at family mean level was strongly correlated with the asymptote parameter (rfam = 0.93, P<0.01) and the growth rate parameter (rfam = -0.70, P<0.01).

Key words:

, , , ,




109–122 D. Lazdiņa, S. Šēnhofa, M. Zeps, K. Makovskis, I. Bebre and Ā. Jansons
The early growth and fall frost damage of poplar clones in Latvia
Abstract |
Full text PDF (781 kB)

The early growth and fall frost damage of poplar clones in Latvia

D. Lazdiņa*, S. Šēnhofa, M. Zeps, K. Makovskis, I. Bebre and Ā. Jansons

Latvian State Forest Research Institute ʻSilava’, Rigas 111, LV 2169 Salaspils, Latvia
*Correspondence: dagnija.lazdina@silava.lv

Abstract:

The early growth and frost damage of Populus spp. was studied in two sites. The height of 23 five-year-old poplar clones was measured in the central part of Latvia; and the early-fall frost damage of 19 one-year-old and two-year-old poplar clones were assessed in the eastern part of Latvia. The relation between the height growth and frost damage of 16 clones, which were common for both sites, was assessed. The phenologically dormant stage was denoted for three clones, among which two are collected across Latvia (the origin un-known; introduced in 1960s). All the other clones had trees with damaged leaves and two clones had stem damage. The height of the clones ranged from 273.3 ± 60.2 to 711.0 ± 32.0 cm. The 3 most productive clones (LV3, LV1 and LV4) significantly (P < 0.01) exceeded others, by 34 and 65% for height and biomass, respectively. The mean height of these clones was 649.0 ± 21.5 cm and stem biomass varied from 33.7 ± 4.2 to 55.0 ± 6.4 tfresh=ha-1 (planting density 6,500 trees=ha-1). The clone had significant (P < 0.01) effect on the phenological stage, leaf and stem frost damage, as well as on the height and stem biomass. No relation (P > 0.05) between the frost damage of leaves and both tree height and stem biomass was found. The results suggest that fast-growing frost-tolerant clones might be selected.

Key words:

, , , , ,