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|ŠUMARSKI LIST 1-2/1973 str. 41 <-- 41 --> PDF|
Skorić A., Racz Z., Modrić A.. Kovačević P. (1963): Detaljno proučavanje
glavnih tipova zemljišta Jugoslavije. Izvještaj Sav. fondu za nauč. rad za
1962. za područje SRH. Institut za pedol. i tehnol. tla, Poljoprivr. fakultet u Zagrebu.
Skorić A., Haj din Ž., Martinović J. (1967): Prilog izboru tala i agrotehničkih
mjera pri intenzivnom uzgoju četinjača na Kordunu. III kongres
*** (1966): Osobine tala nekih lokaliteta na području Šumarije Duga Resa. Dokumentacija
Jug. instituta za četinjače, Jastrebarsko. Zavod za pedologiju Poljoprivrednog
i Šumarskog fakulteta u Zagrebu.
AN INVESTIGATION INTO THE PRODUCTIVITY OF HEATHER AND BRACKEN
KOILS UNDER YOUNG CULTURES OF SCOTS PINE (PINUS SYLVESTRIS L.) IN
THE REGION OF THE FOREST ENTERPRISE KARLOVAC
Investigated was the thriving of some young cultures of Scots Pine on the soils
of layered structure in the heather and bracken area of the Forest Enterprise Karlovac.
The investigation was concentrated on a study of the physical properties of
soils of layered structure and their influence on the growth of Scots Pine.
Established was a great variability od depth of the surface loes-like layer of
the soils investigated, which was especially marked in areas where soil groups II,
III and IV were shifting.
Further, through investigations the ecological importance of the aforementioned
division into soil groups was confirmed. Thus young cultures of Scots Pine exhibited
the best growing on the sample plots of soil group I, and then of group II and group
III. This conclusion coincides with the established total amount of available water in
individual profiles, as visible from Graph 8.
When considering the results of investigations for individual profiles with respect
to the established growth of Scots Pine according to the sample plots, we ought
to take into consideration the difficulty about the proper choice of the characteristic
profile. Thus, with a supplemental verification of the soil depth on plot 4, a considerably
greater share of soil group III was established, which differed from the
previous finding. A definition of the area with the share of soil groups II, III and
IV in the pedological sense remains also further an open problem, because practically
there are no surface signs with which the underground variability would correlate
Although Scots Pine exhibits an equal growth in cultures established in the
same soil group, individual localities possess certain definite specific. This could be
explained in the first place by climatic differences of fairly distant cultures, such
as Drenovac and Sadilovac (distance 63 km), and also by other differences (seed
source, quality of planting stock, etc.).
The weather conditions in individuals years also had a very marked effect on
the height growth of Scots Pine. Thus in the markedly dry years 1968 and 1971 a
noticeable diminution of the height growth in relation to other years of the investigated
period was recorded.
Because of the small number of investigations about the nutrition of Scots Pine,
it is difficult to give a more precise estimate of the nutrient status of these cultures.
More comprehensive investigations in this field were carried out by Fielder and
Höhne (1967) in 6—10 year-old cultures of Scots Pine. In these investigations it was
established that the nitrogen content in needles decreases with the diminution of
humidity in the soil, and increases with the increase of nutrition. According to
Heindsdorf (1967), fertilization with nitrogen positively influences the growth of
Scots Pine cultures if needles contain less than 1.5—1.6% N. An approximately limiting
value for nitrogen was also established by Kraus (1963). The investigated cultures
in soil group I lie over the mentioned walue, while the concentration of nitrogen
in the needles of Scots Pine in other two soil groups equals the limiting concentration.