Response of pine forests to acid deposition. II. the pine stands
The effects of acid deposition on the growth of the Scots pine stands were investigated in the gradient of 22 study plots located in various distances from the emission sources of sulfur and nitrogen oxides. The statistically significant, negative relationship has been found between the stand volume, the volume increment and the degree of site acidification expressed by the forest degradation index (WDL) calculated on the basis of parameters related to acid-induced effects on soil and needle chemistry. Regression equation describing the dependence of the stand volume from the WDL was used to determine the production losses due to site acidification.
Both the radial and the volume increment during the period 1994-1998 appeared to be distinctly higher compare to the period 1989-1993, presumably due to more favorable climatic conditions as a main causative factor.
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