DIGITALNA ARHIVA ŠUMARSKOG LISTA
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| ŠUMARSKI LIST 13/2011 str. 169 <-- 169 --> PDF |
V. Roth, S. Dekanić, T. Dubravac: UTJECAJ KRUPNOĆE ŽIRANAMORFOLOŠKI RAZVOJ JEDNOGODIŠNJIH ... Šumarski list – Posebni broj (2011), 159-168 Tripathi,R.S., M.L. Kahn,1990: Effects of seed Vera,F.W.M., 2000: Grazing ecology and forest history. weight and microsite characteristics on germina-CAB International, 506 str.,Wallingford, UK. tion and seedling fitness in two sepcies ofQuer- Wagner,P.A., E.Dreyer,1997: Interactive effects cus in a subtropical wet forest. Oikos 57: of waterlogging and irradiance on the photosynt289– 296. hetic performance of seedlings from three oak Valladares,F.,J.M.Chico, I.Aranda, L.Bala- species displaying different sensitivities (Querguer, P.Dizengremel, E.Manrique, E., cus robur,Q petraea and Q rubra). Annals of Forest Science 54:409–429. light tolerance ofQuercus roburoverFagus syl-Welander, N.T., B. Ottosson, 2000: The infvatica is linked to a greater physiological luence of low light, drought and fertilization on plasticity. Trees 16:395–403. E. Dreyer, 2002: The greater seedling high- transpiration and growth in young seedlings of van Hees,A.F.M., 1997: Growth and morphology of Quercus robur L..Forest Ecology and Manage- pedunculate oak (Quercus robur L.) and beech ment 127:139–151. (Fagus sylvaticaL.) seedlings in relation to sha-Žgela,M., 1999: Proizvodnja šumskog sjemena u ding and drought.Annals of Forest Science 54: sjemenskim plantažama. Rad. Šumar. ins. 34(1): 9–18. 103–121. SUMMARY: Increase of the share of high-quality seedlings in the total production on the one hand enhances the production efficiency of the nursery production, and on the other hand improves the probability for successful planting in the field. The quality of the seedlings after the first growing season is related to the quality of the seeds used. In the tree species with large seeds, like pedunculate oak (QuercusroburL.), quality is related to the size of the seed, i.e. the amount of stored nutrients. Therefore, the aim of this contribution is to evaluate the effect of acorn size on the morphological development of pedunculate oak seedlings during the first growing season under contrasting light regimes. In total, 891 visually healthy acorns collected in the certified seed stand were planted in the “Bosnaplast” containers filled with peat (Figure 1). Part of the containers were kept in the shade of about 10 % of full light during the whole experiment. Before sowing, diameter, weight and length was measured on subsample of 200 acorns. Regression analysis showed that the acorn mass as the most important predictor of the nutrient content much more depends on the acorn diameter, than on the acorn length (Figure 2). Therefore, three acorn size classes were formed according to distribution of the acorn diameters: small acorns (. 16 mm of diameter), medium-sized acorns (16,1 mm to 17,9 mm of diameter) and large acorns (. 18 mm of diameter). During the sowing, acorns were measured for diameter and grouped into three classes of acorn size. Position of each acorn was recorded within the container and each container was labeled to facilitate the connection between the measurements of the acorn size and the subsequent measurements of the emerged seedlings. Subsample of 25 seedlings was removed from the experiment with fully developed leaves for detailed measurements of leaf area, and allocation patterns of dry biomass into three plant compartments: leaf, root, and stem. After the first growing season, height and root collar diameter were measured on all emerged seedlings. Effect of acorn size and light regime on morphological features of one-year old seedlings of pedunculate oak were examined with the analysis of variance. Following morphological features of seedlings were tested: height (Figure 3A and Table 1) and root collar diameter (Figure 3B and Table 1) of the seedlings, leaf area (Figure 4A and Table 2) and specific leaf area (Figure 4B and Table 2) of the seedlings, dry weight (Figure 5A and Table 3) and ratio of aboveground: underground dry weight of the seedlings (Figure 5B and Table 3). |