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Nitrogen budgets for Scots pine and Norway spruce ecosystems 12 and 7 years after the end of long-term fertilisation

Ladanai, Svetlana and Ågren, Göran and Hyvönen , Riitta and Lundkvist, Helene (2007). Nitrogen budgets for Scots pine and Norway spruce ecosystems 12 and 7 years after the end of long-term fertilisation. Forest ecology and management. 238:1-3, 130-140
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Official URL: http://dx.doi.org/10.1016/j.foreco.2006.10.005

Abstract

The magnitude of nitrogen storage and its temporal change in forest ecosystems are important when analysing global change. For example, the accelerated growth of European forests has been linked to increased nitrogen deposition, but the changes in the N inputs that cause long-term changes in ecosystems have not yet been identified. We used two Swedish forest optimum nutrition experiments with Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies (L.) Karst.) to study the long-term fate of N applied to these forest ecosystems. In the pine experiment, in addition to fertiliser (NPK) application, soil acidity was manipulated by application of lime and dilute sulphuric acid. From the spruce experiment, we selected treatments with similar fertiliser doses as in the pine experiment and with and without lime addition. We quantified various terms in the N budget 12 years (pine) and 7 years (spruce) after the last N addition. In the pine stand the NPK-treatment was the only treatment to produce a significant increase in N in the tree biomass (97% above control), whereas in the spruce stand the N additions increased tree N in all treatment combinations (207% above control). In the pine stand the relative distribution of nitrogen between trees and soil did not vary across treatments, with trees containing around 12% of ecosystem N and humus containing around 44% of soil N. The increases in N stocks in the pine stands were mainly in the soil. In contrast, in the spruce ecosystem trees accumulated most of the added N and the increase in the soil was restricted to the humus layer. In the pine ecosystem, large losses of added N (between 254 and 738 kg ha1 out of 1040 kg ha1 added as fertiliser) occurred, whereas in the spruce ecosystem we recovered more N than could be accounted for by inputs (between 250 and 591 kg ha1). There was no clear pattern in the interaction between acidification/liming and N additions

Authors/Creators:Ladanai, Svetlana and Ågren, Göran and Hyvönen , Riitta and Lundkvist, Helene
Title:Nitrogen budgets for Scots pine and Norway spruce ecosystems 12 and 7 years after the end of long-term fertilisation
Series/Journal:Forest ecology and management (0378-1127)
Year of publishing :2007
Volume:238
Number:1-3
Page range:130-140
Publisher:Elsevier
ISSN:0378-1127
Language:English
Additional Information:Originally published by Elsevier.
Publication Type:Journal article
Refereed:Yes
Full Text Status:Public
Subjects:Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Soil science > Soil chemistry
Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Plant production > Forestry
Keywords:soil nitrogen , long-term fertilisation , nitrogen budget, nitrogen retention, acidification, liming, Picea abies, Pinus sylvestris
URN:NBN:urn:nbn:se:slu:epsilon-8-931
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-8-931
ID Code:5577
Department:(NL, NJ) > Dept. of Energy and Technology
Deposited By: Svetlana Ladanai
Deposited On:18 Jan 2011 00:00
Metadata Last Modified:02 Dec 2014 10:41

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