Original scientific paper
Natural regeneration of pedunculate oak stands of wet type in disturbed condition of Pokupsko basin
Tomislav Dubravac
orcid.org/0000-0003-3133-8322
; Forest Research Institute, Jastrebarsko
Vlado Krejči
; Forest Research Institute, Jastrebarsko
Abstract
The paper presents the results of investigation on natural reforestation of moist type
Pedunculate oak stands in disrupted stand conditions. Investigations are based on two levels,
establishment of a field experiment artificial browsing and in a stand on three experimental
plots. For the purpose of investigating the re-establishment of damaged-degraded
stands, caused by the repeated browsing of roe-deer game, at the end of March 1992, an experiment
was set up by artificial browsing in a young, six year old stand of Pedunculate oak
and Common hornbeam. During several years of monitoring with eight successive measurements
(1991-1998) and measurement in 2005, the height development of young growth
was monitored. Measurement of heights during the first four years was performed with a
metal metre and a spirit level, and the following years with a telescopic lath (surveyor's
pole). During 14 years of monitoring, from the establishment of the experiment up until
2005, 69% of the monitored Pedunculate oak young trees died naturally (without tending).
The number of Pedunculate oak plants, starting with 1.68 per m2 in 2005 amounted to
0.46 young trees per m2.
For the purpose of monitoring the influence of biotic and abiotic factors on the natural
reforestation of Pedunculate oak, three permanent plots were established in a natural stand
of Pedunculate oak and Green Weed (Genisto elatae- Quercetum roboris caricetosum
brizoides Horv. 1938). Monitoring of the experiment occurred at the time of seed cuttings.
In order to monitor the reestablishment and development of young growth on the edges and
in the middle of the sub-plot, three 'strips' 6o x 2 m were laid out. Measurements of all
woody plants were repeated on the strips, divided into seven height classes. On Plot 2 of the
20 972 young trees in 1998, only 2 944 (14%) remained in 2000; mainly top-dry oak
young trees, while Plot 3 was without seedlings. Following a good acorn crop in 2000, the
following year on Plot 2 76 333 were measured, and on Plot 3 34 333 one-year old young
trees of Pedunculate oak. After two years (2003) 17% survived on Plot 2, and on Plot 3 only
6%, mainly top-dry and poor quality new growth of Pedunculate oak seedlings. By monitoring
the course of appearance and development of Pedunculate oak young growth from
1998 to 2003 it is evident that, without repeated tending and protection of seedling plants,
the natural re-establishment of stands in disrupted stand conditions, is impossible.
Keywords
Pedunculate oak,; regeneration; soil, artificial browsing; young growth; stand structure
Hrčak ID:
26007
URI
Publication date:
24.9.2006.
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