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Growth and nutrition of coniferous forests on acidic mineral soils - status and effects of liming and fertilization

Sikström, Ulf (2001). Growth and nutrition of coniferous forests on acidic mineral soils - status and effects of liming and fertilization. Diss. (sammanfattning/summary) Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae. Silvestria, 1401-6230
ISBN 91-576-6066-2
[Doctoral thesis]

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Deposited air-borne S- and N -containing pollutants acidify forest soils in southern Sweden. It has been suggested that this may severely affect forest yield. Liming and/or application of specific nutrients, e.g. phosphorus (P) and potassium (K), have been proposed as countermeasures. The influence of such measures, and of nitrogen (N) addition, was investigated in two experimental series over 5-10 years. Stem growth and needle element concentrations were assessed, predominantly in high-yielding Norway spruce [Picea abies (L.) Karst.] and Scots pine (Pinus sylvestris L.) stands, 30-60 years old, growing on acidic mineral soils in southern Sweden. The effect on crown transparency was also evaluated in some of the Norway spruce stands. In all experiments a randomized block design was used. The treatments included liming (500-6,000 kg ha1), and N addition at low annual doses (2x10 kg N ha1) and in single shots (150 kg N ha1). Combinations of lime+N, lime+PK and lime+PKN were also tested. The effects were generally weak or negligible, except that growth was significantly increased by N fertilization in the Scots pine stands, and by lime+PKN in some of the Norway spruce stands.
In another study, the survival and growth of Norway spruce seedlings were found to be more or less unaffected when planted in pre-harvest acidified, limed or N fertilized soil, although the Ca and Zn concentrations in their needles rose after liming, while those of Mn and A1 declined.
In closed-canopy stands of Norway spruce and Scots pine with N concentrations of more than 15-16 mg (g DM)'1 in current-year needles, N fertilization was indicated to not necessarily stimulate increased growth. Other indicators of highly N-rich forests (e.g. elevated arginine levels) also start to appear above this level.
The closed-canopy stands growing on the most acidic soils showed no signs of severe damage or nutrient deficiencies. These findings, together with the small or negligible effects of the tested countermeasures against soil acidification, suggest that as regards stem growth, needle-element concentrations or crown transparency, there seems to be no acute need for liming and/or PK addition in SW Sweden in Norway spruce stands on sites similar to those examined.

Authors/Creators:Sikström, Ulf
Title:Growth and nutrition of coniferous forests on acidic mineral soils - status and effects of liming and fertilization
Series Name/Journal:Acta Universitatis Agriculturae Sueciae. Silvestria
Year of publishing :2001
Number of Pages:54
Publisher:Swedish University of Agricultural Sciences
ISBN for printed version:91-576-6066-2
Publication Type:Doctoral thesis
Article category:Other scientific
Version:Published version
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
Keywords:acidification, ammonium nitrate, calcite, crown transparency, defoliation, dolomite, forest production, needle chemistry, Norway spruce, phosphorous, Picea abies, Pinus sylvestris, potassium, regeneration, Scots pine
Permanent URL:
ID Code:17705
Faculty:S - Faculty of Forest Sciences
Department:(S) > Southern Swedish Forest Research Centre
Deposited By: SLUpub Connector
Deposited On:06 Oct 2020 13:44
Metadata Last Modified:15 Oct 2020 13:50

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