DIGITALNA ARHIVA ŠUMARSKOG LISTA
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| ŠUMARSKI LIST 13/2005 str. 254 <-- 254 --> PDF |
CONCLUSIONS Šumarski list - SUPLF.MENT (2005), 251-252 water quality between the National Park and multipurpose forests subjected to silvicultural tending treatments. Water of inferior quality was found in watercourses in the vicinity of settlements and outside forests. No differences were found in the quality of water arriving from various forest ecosystems. This is an indication of a generally favourable impact of forest on water purification, whether water enters a watercourse as surface runoff (purification through the accumulation soil horizon) or arrives from underground flows as spring water (Tikvić et al.). 9. Values of non-commercial forest functions have more recently captured the interest of forestry experts dealing with the evaluation of raw material- energetic function, or direct use of forests. Since they are in fact hidden ecological and biological capital of invaluable worth, the majority of activities based on the principles of profitable economy represent significantly underestimated values. The value of anti-erosive and water-protective role of forests was presented at the symposium according to the methodology set down in the by-act of the Forest Act of the Republic of Croatia. The intention was to prevent cheap sale and conversion of the Croatian forest wealth (Prpić, Jurjević, Jakovac). Although the value of these two most important forest functions is also underestimated (the amount of assessment indicators has not changed for 9 years), it is still twice as high as that from the last evaluation. 10. The papers presented at this symposium have confirmed that forest ecosystems efficiently influence water cycling in the landscape by mitigating high water waves, preventing water-induced soil erosion and torrents, and purifying precipitation and flood water, which is percolated in underground flows below the forest. The highest efficiency is manifested by a multi-purpose natural forest, which ensures both the raw material - energetic function and non-commercial forest functions. Natural forest is a forest with a natural structure whose trees have not reached physiological over- maturity. In the life of a forest, natural forest is in the optimal stage of production and protection of nature and the environment. Since the anti-erosion and water-protective role of a forest and its preservation is of prime importance, research in this field should continue. Forestry should be granted the power to make decisions related to spatial plans. It should also receive compensation for the use of drinking water, since its production in a forest requires sophisticated silvicultural treatments of forest stands. In view of the fact that forest is one of the most useful water management facilities, the Croatian forestry should be exempt from paying water fees. |