Changes in the Above- and Below-ground Biomass and Nutrient Pools of Ground Vegetation After Clear-cutting of a Mixed Boreal Forest |
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Authors: | Marjo Palviainen Leena Finér Hannu Mannerkoski Sirpa Piirainen Michael Starr |
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Affiliation: | (1) Finnish Forest Research Institute, Joensuu Research Centre, P. O. Box 68, FIN-80101 Joensuu, Finland;(2) Faculty of Foresty, University of Joensuu, P. O. Box 111, FIN-80101 Joensuu, Finland;(3) Department of Forest Ecology, University of Helsinki, P. O. Box 27, FIN-00014 Helsinki, Finland |
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Abstract: | Ground vegetation may act as a sink for nutrients after clear-cutting and thus decrease leaching losses. Biomass and nutrient (N, P, K, Ca) pools of ground vegetation (mosses, roots and above-ground parts of field layer) were determined one year before and five years after clear-cutting of a Norway spruce (Picea abies (L.) H. Karst.) dominated boreal mixed forest stand in eastern Finland (63°51′ N, 28°58′ E). Before clear-cutting the average biomass of ground vegetation was 5307 kg ha−1, with nutrient contents of 46.9 kg N ha−11, 4.1 kg P ha−11, 16.2 kg K ha−11 and 13.9 kg Ca ha−11. The biomass and nutrient pools decreased after clear-cutting being lowest in the second year, the biomass decreasing by 46–65% in the cut plots. The nutrient pools decreased as follows: N 54–72%, P 36–68%, K 51–71% and Ca 57–74%. The decrease in ground vegetation nutrient uptake, and the observed reduced depth of rooting may decrease nutrient retention after clear-cutting and decomposing dead ground vegetation is a potential source of leached nutrients. These negative effects of clear-cutting on the nutrient binding capacity of ground vegetation was short-lived since the total biomass and nutrient pools returned to pre-cutting levels or were even greater by the end of the 5-year study period. |
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Keywords: | field layer leaching losses mosses nutrient accumulation roots |
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