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Effect of aerotechnogenic impact of pulp and paper production on the pigment complex of Scots pine

Here we present the results of studying the effect of aerotechnogenic emissions of pulp and paper production of Mondi Syktyvkar Timber Processing Complex JSC (STPC) on the pigment system of Scots pine ( Pinus sylvestris L.) needles in blueberry and lichen pine forests over a 25-year observation period. We conducted comparative analysis of the indica- tors of the pigment complex of the pine in background and impacted areas. In 1993–1995, aerotechnogenic pollution of the environment was 20–100 times higher in the area of strong impact compared to the background and had a negative impact on the Scots pine pigment complex. Pollutants were found to inhibit the synthesis of photosynthetic pigments. The pine plastid apparatus adapts to the condition of pollution by changing the ratio of pigment components. Changes in the pigment complex of needles occurred in lichen pine forests due to reduction of chlorophyll b content, in blueberry type of forest –chlorophyll a . After the decrease in volume of industrial emissions in 2015 and 2018, several changes occurred in the pigment apparatus of pine needles in the impacted area. In view of a significant reduction in industrial emissions, chloroplasts demonstrated an increase in pigment content even in the area adjacent to the emission source. With a weakening technogenic impact (in the area of moderate contamination), the photosynthetic and respiration abilities of the needles do not undergo changes. This indicates the stability of the basic processes of pine vital activity, and its resistance to pollution.