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ŠUMARSKI LIST 3-4/1996 str. 70     <-- 70 -->        PDF

A. P. B. Krpan: PROBLEM PRIVLAČENJA DRVA U NIZINSKIM ŠUMAMA HRVATSKE Šumarski list br. 3—4, CXX (19%), 151—156
SUMMARY: Difficult terrains of forest exploitation in the Republic of Croatia
cannot be merely found in mountainous region of the Dinarids or the
central and marginal Panonian highlands where terrain slopes and significant
surface obstacles represent a complicating factor. Problems frequently
arise at the exploitation of lowland forests in which the highgrade pedunculate
oak predominates. Pedunculate oak forests grow in lowland flooded areas on
deep running coherent soils which are almost throughout the year, particularly
during the winter felling and skidding period exposed to the moistening of


flood, precipitation or ground water. With the absence of strong winters which
has become quite regular in the past few years, the before mentioned moistened
soils become a limiting factor at the application of standard machinery
equipment.


Skidders, forwarders and recently introduced mobile cable cranes are frequently
used for skidding round timber in seed and final felling Croatian lowland
forests.


In order to protect soil at final felling of oak, skidders and forwarders are
used in convenient ground strength conditions. On the contrary, mobile cable
cranes are used.


This paper presents research results obtained by measurements at the LKT
81 skidder, the VKS 9041 forwarder and the STEYR KSK 16 mobile cable
crane on skidding pedunculate oak round timber. With respect to tree dimensions
at final felling the wood assortment method has been mainly used.


Key words: skidder, forwarder, mobile cable crane, work study, productivity