DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 1-2/1990 str. 64     <-- 64 -->        PDF

2990 ha. The raising of arborescent willow plantations has been intensified due primarily
to the establishment of collections of clones, selected and verified through
a series of experiments. The sites, on the Danube islands, where the success of three
clones in established plantations age 4—16 and 225 ha has been assessed, can be divided
into 5 site qualities, which are related to the following plant comunities
(biotopes):


I Galio-Salicetum albae Rauš 73
II Populetum nigro-albae Slav. 52
III Šalici Populetum nigrae Tx. 31 (Meijer — Drees 36) rubetosum caesii Rauš 73
IV Salicetum purpureae Wend. — Zeil. 52, Scirpo-Phragmitetum W. Koch 26 et


Uligines
V Paludes
In order to increase the wood mass production in arborescent willow plantations,
the following principles should be adhered to:


1. For each site quality, the optimal clone mixture has to be selected, showing
a specific adaptation to that particular site.
2. Plantations should be multi-clonal.
3. The arrangement of clones in plantations should be mosaic (in groups) in
order to alleviate competiton between clones.
4. Plantation spacing on site quality I, II and III should be 4 x 4 m, possibly
with one inter-row of same clone, with 2 m spacing. Felling of trees in the inter-
row should be done after 8—10 years, while the rotation of remaining plantation
trees, at 4 x 4 m spacing, would be 20 years for purposes of log production. On
other sites we recommend 3 x 3 m spacing.
5. On site quality I and III (site quality II is relatively dry for willow!), low-
cost technology for plantation raising may be applied: by means of one-year
twigs, while on all other sites we recommend that strong rootings or sticks of
2/2 and 2/0 age be used.
6. On heavy, flooded and weed-grown sites along the Sava River, willow plantations
"may serve as pioneer plantations, as they facilitate reforestation with more
valuable broad-leaved species (Fraxinus angustifolia, Quercus robur) on clearings
and devastasted parts within the existing hardwood broad-leaved stands.