engleski

Forest crown condition and monitoring deposited matter in Gorski Kotar area in Croatia.

Monitoring the state of crown damage in 2004 in the Republic of Croatia showed a further increase in the percentage of significant tree damage of all species. The amount of damage to all species, in particular Silver fir, in the Gorski Kotar region, is worrying: Silver fir with 88.4 % of significant damage is in a very poor condition, and beech is also of poor vitality with 20.1 % significantly damaged trees. This high percentage of significant damage in the investigated area is a consequence of intensive dieback of fir. Monitoring of precipitation and liquid phase of the soil is also carried out on the experimental plot in the same area. Data show that the annual introduction of nitrogeneous compounds/substances/ for Gorski Kotar amounts to approximately 16 - 18 kgha- 1. In the same way the investigated plot received approximately 8 kgha-1 chloride and about 9 kgha-1 sulphur. On average the lysimeters had a higher content of sedimentary substances than the values registered in the rain-gauges under the tree-crowns. This data points to the reason for lower pH values in lysimetric samples. Accumulation of depository substances on the soil surface and further transport through the soil profile into seepage and ground water is evident. Deposited matters effect the soil and the quality of seepage water.

Crown damage; deposition; lysimeters; Gorski kotar; Croatia

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