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Acorn Size of Pedunculate Oak (Quercus robur L.) and Sessile Oak (Quercus petraea Liebl.) as a Factor in Growth and Development of Seedlings

Valentin Roth ; Šumarski institut Jastrebarsko
Tomislav Dubravac ; Šumarski institut Jastrebarsko
Ivan Pilaš ; Šumarski institut Jastrebarsko
Stjepan Dekanić ; Šumarski institut Jastrebarsko
Zdravko Brekalo ; Hrvatske šume Šumarija Grubušno Polje

Puni tekst: hrvatski pdf 238 Kb

str. 257-266

preuzimanja: 1.159



Investigations were carried out on three samples of Pedunc led oak (Quercus robur L.) and three samples of Sessile-flowered oak (Quer cus petraea Liebl.), of different plumpness (Table 1).
Seeding was performed on two locations in November 2003 in the forest nursery of the Division for Nursery Production, Forest Research Institute, Ja­strebarsko (45o 40’ N, 15o 39’ E) and in the nursery “Zdenački Gaj” (45o 35’ N, 17o 05’ E), Forestry Office of “Grubišno polje”.
At the end of the first vegetation (15th October, 2004) measurement of heights of the investigated samples was performed. At the end of the second vegetation (Autumn 2005) measurements of the heights were performed, and on an average sample determination was also made of the mass of dry matter in the above ground part of the investigated Peduncled oak and Sessile-flowe red samples (2+0).
Influence of the acorn plumpness on the height of one-year plants (1+0) and two-year plants (2+0) of Peduncled oak and Sessile-flowered oak, was evident on both localities in the nursery part of the test (Tables 1 & 2, 6 & 7, Graphs 3 & 4). Bigger acorns of pedunculate and sessile oak produce one-and two-year old seedlings of significantly greater height.
The quantity (mass) of the dry matter in the above ground part of the inve stigated samples of Peduncled oak and Sessile-flowered oak, at the age of 2+0, also showed marked differences, conditioned by the plumpness of acorn (Table 8, Graphs 5 & 6). According to the acorn size, biomass of dry matter of above-ground parts of seedlings of pedunculate and sessile oak at age of two years can be two to five times greater.
Increased ability of sorption in soils with greater clay content is probable cause for lower productivity of soil in “Jastrebarsko” nursery, inspite of its greater content of nutrients (N, P and K). Retention of nutrients on the surface of clay particles makes them inaccessible to the plants, and causes reduced growth of seedlings. Another probable cause of weaker growth of seedlings is the impaired water holding characteristics of soil in “Jastrebarsko” nursery. According to the soil texture, heavier soil in “Jastrebarsko” has a lower aera tion in the rooting zone, which together with prolongation of reduction conditions favors inferior water-air conditions in comparison to the “Zdenački Gaj” nursery.
All three samples of Peduncled oak and Sessile-flowered oak showed mar kedly greater heights, as well as the mass of dry matter in the above ground part, in the nursery with lighter mechanical composition of soil.

Ključne riječi

acorn plumpness; Peduncled oak (Quercus robur L.); plant heights; Sessile-flowered oak (Quercus petraea Liebl.)

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