Carbon and nitrogen pools and mineralization rates in boreal forest soil after stump harvesting

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http://hdl.handle.net/10138/175833

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Kaarakka , L , Hyvönen , R , Strömgren , M , Palviainen , M , Persson , T , Olsson , B A , Launonen , E , Vegerfors , B & Helmisaari , H-S 2016 , ' Carbon and nitrogen pools and mineralization rates in boreal forest soil after stump harvesting ' , Forest Ecology and Management , vol. 377 , pp. 61-70 . https://doi.org/10.1016/j.foreco.2016.06.042

Title: Carbon and nitrogen pools and mineralization rates in boreal forest soil after stump harvesting
Author: Kaarakka, Lilli; Hyvönen, Riitta; Strömgren, Monika; Palviainen, Marjo; Persson, Tryggve; Olsson, Bengt A; Launonen, Erno; Vegerfors, Birgitta; Helmisaari, Heljä-Sisko
Contributor: University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Forest Sciences
Date: 2016
Language: eng
Number of pages: 10
Belongs to series: Forest Ecology and Management
ISSN: 0378-1127
URI: http://hdl.handle.net/10138/175833
Abstract: The use of forest-derived biomass has steadily increased in Finland and Sweden during the past decades leading to more intensive forest management practices in the region, such as whole-tree harvesting, both above- and belowground. Stump harvesting results in a direct removal of stump and coarse-root carbon (C) from the stand and can cause extensive soil disturbance, which has been suggested to increase C mineralization. In this study, the effects of stump harvesting on soil C and nitrogen (N) mineralization, and soil surface disturbance were studied in two different clear-felled Norway spruce (Picea abies) sites in Central Finland. The treatments were whole-tree harvesting (WTH, removal of stems and logging residues), and WTH and stump harvesting (WTH + S). Both sites, Honkola (2 stands) and Haukilahti (6 stands) were mounded. In both treatments, soil samples were taken from different soil layers down to a total depth of 20 cm in the mineral soil from (i) mounds, (ii) undisturbed soil and (iii) pits. The sampling was performed 11-12 years after treatments. Soil C and N mineralization rates were determined in laboratory incubation experiments. In addition, total C and N pools (g m(2)) were estimated for each disturbance class and soil layer. Soil C and N pools had a tendency to be lower following stump harvesting, but no statistically significant treatment effect was detected. Stump harvesting increased soil mixing as indicated by a significant decrease in C concentration in the mound disturbance class. There was no significant effect of stump harvesting on soil C mineralization rates. A combination of mineralization rates and soil pool data showed that field C mineralization (g CO2-C m(-2) yr(-1)) did not significantly differ between stands where stumps were removed or were retained. Further, stump harvesting did not seem to have any stimulating effect on soil CO2 efflux 11-12 years after treatment. (C) 2016 Elsevier B.V. All rights reserved.
Subject: 4112 Forestry
Stump harvest
Bioenergy
Norway spruce
Forest soil
Soil carbon
NORWAY SPRUCE STANDS
SCOTS PINE
TREE GROWTH
SITE PREPARATION
SILVER BIRCH
REMOVAL
FINLAND
REGENERATION
SWEDEN
SLASH
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