The State of Siberian Fir Crowns in an Area of Industrial Pollution in the Khamar-Daban Ridge (Southern Baikal Region)
2008
Ziganshin, R.A., Russian Academy of Sciences. Siberian Branch, Krasnoyarsk (Russian Federation). The V.N. Sukachiev Inst. of Forest Science
The results of a repeated inventory and pathological inspection of fir forests at a source of industrial pollution in the southern Khamar-Daban Ridge are analyzed. The state of tree crowns was studied on sample plots. The degree of crown defoliation was admitted as the main criterion of the decline. The following categories of the disturbed trees were distinguished: (1) healthy trees (defoliation is less than 10%); (2) weakly damaged (10—30); (3) moderately damaged (30-50); (4) strongly damaged (50-80); (5) drying (defoliation is more than 80%); (6) fresh dead wood; (7) old dead wood. In 1989 and 1994, 5000 and 500 trees, respectively, were examined on the same sample plots. The transfer of the trees of the second category to the first one and some decrease in the number of trees in the third, fifth, and sixth categories were recorded. The tree stands became healthier. This fact appeared to be due to a decrease in the total volume of pollutants in 1987-1994, since the technology of cellulose production at the Baikal pulp-and-paper complex was improved. In addition, the stands looked healthier due to the parallel renewal of needles.
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