The effect of changed ecological conditions on the growth process of spruce ecosystems
1993
Vosko, M. | Klubica, D. (Slovenska Akademia Vied, Zvolen (Slovak Republic). Ustav Ekologie Lesa)
A retrospective model of diameter increment of forest ecosystems and their biometric characteristics in the dependance on the athmogenous pollution on monitoring plots in Cadca forest enterprise is presented. Real periodic increment (BPP-h) was compared with the one given in the tables (theoretical) on 3 monitoring plots. In the observed period, BPP-h dropped by 4.47 mm compared to natural increment. Synergic effect of the immisions contributes in average by 42.3 % to this decrease. The decrease of the increment suggests also unfavourable changes in the resistance potential of the forests and changes in their structure. The share of the stands with ecologically favourable, and suitable tree species composition with regard to the site has permanently decreasing trend, and present spatial construction of the stands is insufficient for the creation of the forest resistance against the effect of natural harmful agents.
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
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