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Nutrient relations in coniferous forests

Ladanai, Svetlana (2008). Nutrient relations in coniferous forests. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2008:94
ISBN 978-91-86195-27-4
[Doctoral thesis]

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The environment controls physiological processes in plants and thus their growth. The question how forests will respond to global environmental changes is addressed with different approaches and using two coniferous tree species: Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies (L.) Karst.) I have used the relationship (nitrogen productivity) between a plant's growth rate and the amount of nitrogen in the plant to analyse the growth response to temperature. Data on needle dry matter, production, and nitrogen content in needles from a wide range of climatic conditions were collected and needle nitrogen productivities were calculated. The result is that the nitrogen productivity (net carbon gain of a canopy) of conifers is not sensitive to temperature. Growth responses to temperature in conifers are therefore mediated by changes in nitrogen availability. I have used three Swedish forest experiments to study the long-term fate of N addition. The fertilisation increased tree biomass, more strongly for spruce than pine. Once fertilisation had ceased, the growth rates in all treatments in pine and spruce stands at Lisselbo and Stråsan converged towards similar levels. Chronic fertilisation with complete nutrient solution in pine stands at Jädraås resulted in long-term increase in production. Nitrogen budgets established 12 years (pine) and 7 years (spruce) after the last N addition show that 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 ha-1 out of 1040 kg ha-1 added as fertilizer) occurred, whereas in the spruce ecosystem more N was recovered than could be accounted for by inputs (between 250 and 591 kg ha-1). I have used humus and needle nutrients and site characteristic from 37 pine and 50 spruce stands from all over Sweden to analyze forest nutrient relations. Biologically controlled nutrients (C, N, P, S) are less variable and more correlated, but the biological control is not limited to only the covalently bound elements. Stoichiometric relations are not entirely rigid but are more constrained in needles than in humus. The use of nitrogen as a basis in stoichiometric relations may give stronger relations than the use of carbon.

Authors/Creators:Ladanai, Svetlana
Title:Nutrient relations in coniferous forests
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2008
Number of Pages:53
ALLI. Ladanai, S. and Ågren, G.I. 2004. Temperature sensitivity of nitrogen productivity for Scots pine and Norway spruce. Trees: structure and functions 18, 312-319. II. Ladanai, S., Ågren, G.I., Hyvönen, R. and Lundkvist, H. 2007. Nitrogen budgets for Scots pine and Norway spruce ecosystems 12 and 7 years after ending of long-term fertilization. Forest Ecology and Management 238, 130-140. III. Hyvönen, R., Ladanai, S., Ågren, G., Persson, T., Linder, S. and Andersson, B. 2008. Is site productivity permanently changed by fertilization ? (manuscript). IV. Ladanai, S., Ågren, G.I. and Olsson, B.A. 2008. Relationships between tree nutrition, soil properties and site condition in Picea abies and Pinus sylvestris forests in Sweden (Submitted manuskript).
Place of Publication:Uppsala
ISBN for printed version:978-91-86195-27-4
Publication Type:Doctoral thesis
Full Text Status:Public
Agrovoc terms:coniferous forests, pinus sylvestris, picea abies, growth, nitrogen, nutrient availability, fertilizer application, plant response, leaves, humus, climatic change, temperature, forest soils, soil chemicophysical properties, models, sweden
Keywords:tree growth, environmental change, soil nitrogen, nitrogen productivity, conifers, nitrogen budget, long-term fertilisation, stoichiometry, humus, needles.
Permanent URL:
ID Code:1933
Department:(NL, NJ) > Dept. of Ecology
(S) > Dept. of Ecology
Deposited By: Svetlana Ladanai
Deposited On:13 Feb 2009 00:00
Metadata Last Modified:02 Dec 2014 10:15

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