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The carbon sequestration response of aboveground biomass and soils to nutrient enrichment in boreal forests depends on baseline site productivity

Blasko, Robert and Forsmark, Benjamin and Gundale, Michael and Lim, Hyungwoo and Lundmark, Tomas and Nordin, Annika (2022). The carbon sequestration response of aboveground biomass and soils to nutrient enrichment in boreal forests depends on baseline site productivity. Science of the Total Environment. 838 , 156327
[Research article]

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Abstract

Nutrient enrichment can alleviate productivity limitations and thus substantially increase carbon (C) uptake in northern coniferous forests. Yet, factors controlling stand-to-stand variation of forest ecosystem responses to nutrient enrichment remain unclear. We used five long-term (13 years) nutrient-enrichment experiments across Sweden, where nitrogen (N), phosphorus, and potassium were applied annually to young Norway spruce forests that varied in their baseline ecosystem properties. We measured tree biomass and soil C and N stocks, litterfall C inputs, soil CO2 efflux, and shifts in composition and biomass of soil microbial communities to understand the links between above and belowground responses to nutrient enrichment. We found that the strongest responses in tree biomass occurred when baseline site productivity was lowest. High increases in tree biomass C stocks were generally balanced by weaker responses in organic soil C stocks. The average ecosystem C-N response rate was 35 kg C kg-1 N added, with a nearly five-fold greater response rate in tree biomass than in soil. The positive nutrient enrichment effects on ecosystem C sinks were driven by a 95% increase in tree biomass C stocks, 150% increase in litter production, 67% increase in organic layer C stocks, and a 46% reduction in soil CO2 efflux accompanied by compositional changes in soil microbial communities. Our results show that ecosystem C uptake in spruce forests in northern Europe can be substantially enhanced by nutrient enrichment; however, the strength of the responses and whether the enhancement occurs mainly in tree biomass or soils are dependent on baseline forest productivity.

Authors/Creators:Blasko, Robert and Forsmark, Benjamin and Gundale, Michael and Lim, Hyungwoo and Lundmark, Tomas and Nordin, Annika
Title:The carbon sequestration response of aboveground biomass and soils to nutrient enrichment in boreal forests depends on baseline site productivity
Series Name/Journal:Science of the Total Environment
Year of publishing :2022
Volume:838
Article number:156327
Number of Pages:14
Publisher:ELSEVIER
ISSN:0048-9697
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Environmental Sciences (social aspects to be 507)
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
Keywords:Ecosystem carbon stocks, Soil carbon, Soil nitrogen, Litterfall, Soil respiration, Soil microbial community
URN:NBN:urn:nbn:se:slu:epsilon-p-118343
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-118343
Additional ID:
Type of IDID
DOI10.1016/j.scitotenv.2022.156327
Web of Science (WoS)000816969000007
ID Code:28445
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Ecology and Management
(S) > Dept. of Forest Genetics and Plant Physiology
Deposited By: SLUpub Connector
Deposited On:15 Aug 2022 09:14
Metadata Last Modified:15 Aug 2022 09:21

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