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Nitrogen Turnover in Swedish Spruce Forest Ecosystems

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
Title:Nitrogen Turnover in Swedish Spruce Forest Ecosystems
Subtitle:Effects of nitrogen deposition
Year of publishing :January 2002
Volume:342
Number of Pages:37
Papers/manuscripts:
NumberReferences
ALLAndersson, P. Berggren, D. & Johnsson, L. 2001. 30 years of N fertilisation in a forest ecosystem – the fate of added N and effects on N fluxes. Water, air and soil pollution 130, 637-642. Andersson, P. Berggren, D. & Nilsson, I. 2002. Indices for nitrogen status and nitrate leaching from Norway spruce (Picea abies (L.) Karst.) stands in Sweden. Forest ecology and management 157, 39-53. Majdi, H. & Andersson, P. Root production, longevity and nitrogen turnover in response to nutrient availability in a boreal spruce forest. (Manuscript). Andersson, P. 2003. Amino acid concentration in sampled soil water – effects of sampling and storage using lysimeters with a small pore-size and sterile pre-evacuated sampling tubes. Communications in soil science and plant analysis 34 (1-2), 23-31. Andersson, P. and Berggren D. Organic and inorganic nitrogen in forest floor soil solution at low and high N input. (Manuscript)
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
ID Code:142
Department:(NL, NJ) > Dept. of Soil Sciences
Deposited By: Pål Andersson
Deposited On:31 Jan 2003 00:00
Metadata Last Modified:02 Dec 2014 10:01

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