Effects of nitrogen deposition
Andersson, Pål
(2002).
Nitrogen Turnover in Swedish Spruce Forest Ecosystems.
Diss. (sammanfattning/summary)
Uppsala :
Sveriges lantbruksuniv.,
Acta Universitatis Agriculturae Sueciae. Agraria, 1401-6249
; 342
ISBN 91-576-6194-4
[Doctoral thesis]
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Abstract
Nitrate leaching from growing forests is not yet a widespread problem in Sweden, but nitrogen (N) deposition and high N retention in the soil during recent decades might have changed forest ecosystems towards N saturation. In this thesis net N mineralisation (measured with in situ incubations) was tested as an index of N status. It was shown that historic land use and N deposition, natural or simulated in fertilisation experiments, had caused great differences in this index (4-104 kg N ha -1 yr -1 ) and that N leaching occurred at sites with high N status (net N mineralisation > 60 kg N ha -1 yr -1 ). The net N mineralisation was well correlated to C/N ratio, which could also be used as a N status index. The amount of nitrate lost was not dependent on N status or current N deposition, but rather to the total N flux density (deposition + net mineralisation). The relatively fast change (30 years) from a highly N limited ecosystem to a system apparently approaching the first stage of N saturation upon moderate N fertilisation (35 kg N ha -1 yr -1 ) motivates continued concern about N saturation in Sweden. Predicting future response to N deposition and forest management necessitates a thorough understanding of all important N fluxes, but the importance of organic N uptake in Swedish spruce forest ecosystems is still unclear. Budget calculations indicated that uptake of organic N is of great importance (80%) in low input areas. In high N-input plots the relative importance appeared lower (35%). However, soil solution samples from the forest floor contained low concentrations of both amino acids and inorganic N, and the lack of a clear dominance of amino acids might be explained by a tight circulation of amino acids, never releasing the amino acids into the soil solution fraction sampled with tension lysimeters
Authors/Creators: | Andersson, Pål | ||||
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Title: | Nitrogen Turnover in Swedish Spruce Forest Ecosystems | ||||
Subtitle: | Effects of nitrogen deposition | ||||
Year of publishing : | January 2002 | ||||
Number: | 342 | ||||
Number of Pages: | 37 | ||||
Papers/manuscripts: |
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Place of Publication: | Uppsala | ||||
ISBN for printed version: | 91-576-6194-4 | ||||
ISSN: | 1401-6249 | ||||
Language: | English | ||||
Publication Type: | Doctoral thesis | ||||
Full Text Status: | Public | ||||
Agris subject categories.: | P Natural resources > P35 Soil fertility F Plant production > F40 Plant ecology P Natural resources > P34 Soil biology | ||||
Subjects: | Not in use, please see Agris categories | ||||
Agrovoc terms: | boreal forests, ecosystems, picea abies, roots, forest soils, nitrogen cycle, mineralization, cycling, fertilizer application, leaching, amino acids, soil solution, sweden | ||||
Keywords: | boreal, ecosystem recovery, fine root longevity, forest soil, mycorhiza, PnET-CN | ||||
URN:NBN: | urn:nbn:se:slu:epsilon-e-5434 | ||||
Permanent URL: | http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-5434 | ||||
ID Code: | 142 | ||||
Department: | (NL, NJ) > Dept. of Soil Sciences (until 081001) | ||||
Deposited By: | Pål Andersson | ||||
Deposited On: | 31 Jan 2003 00:00 | ||||
Metadata Last Modified: | 02 Dec 2014 10:01 |
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