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Wood ash application effects on elemental turnover in a cutover peatland and uptake in vegetation

Nilsson, Torbjörn (2001). Wood ash application effects on elemental turnover in a cutover peatland and uptake in vegetation. Diss. (sammanfattning/summary) Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae. Silvestria, 1401-6230
ISBN 91-576-6092-1
[Doctoral thesis]

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Abstract

Forest harvesting and removal of logging residues implies loss of essential soil nutrients and may in the long-term endanger site productivity. Compensatory fertilization is now recommended in Sweden for such sites. As wood ash contains all the mineral elements that were withdrawn from the forest ecosystem by harvest, the ash is often suitable as a compensatory fertilizer. Peat is also a fuel that is used to some extent in Sweden. After peat harvesting is terminated, the cutover peatland should be reclaimed. The most common re-use of cutover peatlands is forestry. However, as the nutrient pool in the remaining peat is usually low, especially for P and K, nutrients need to be applied to establish and maintain a sustainable biomass production. As wood ash contain the most necessary nutrients, it is a suitable fertilizer for forestry on cutover peatlands. This thesis investigates how wood ash fertilization on a cutover peatland affects i) the distribution of ash elements in the peat, ii) the leaching of these ash elements and iii) the biomass and nutrient allocation in different compartments in 3-7 year-old trees of seven different species; and how the application of different wood ash and lime products on a mineral soil affects iv) the uptake of nutrients and heavy metals in bilberry fruit.
To achieve soil nutrient conditions suitable for forest growth, wood ash (23 000 kg ha'1) was applied to a cutover peatland in west-central Sweden. Seven tree species were planted and for all of these except two Salix species, the increase in soil pH and nutrient pools seemed sufficient to maintain a sustainable biomass production. The crucial growth limiting nutrients, K and P, were applied in large quantities, 670 and 210 kg ha1 respectively. However, these two elements will probably be growth limiting in the next tree generation, as an marked increase in the output of K was observed in the stream water, and as phosphate ions could be adsorbed to the large amount of Fe compounds present in the peat.
In the short-term, the application of different wood ash products on a mineral soil did not significantly affect the content of different nutrients or heavy metals in bilberry fruit, even if high doses were applied.
It can be concluded that wood ash fertilization on cutover peatlands and compensatory fertilization with wood ash on mineral soils are both suitable soil improvement measures that have relatively small effects on the environment if precautions are taken concerning the quality of the wood ash product.

Authors/Creators:Nilsson, Torbjörn
Title:Wood ash application effects on elemental turnover in a cutover peatland and uptake in vegetation
Year of publishing :2001
Number:208
Number of Pages:35
Publisher:Swedish University of Agricultural Sciences
ISBN for printed version:91-576-6092-1
ISSN:1401-6230
Language:English
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
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science
Keywords:Alnus incana, Alnus glutinosa, base cations, Betula pubescens, heavy metals,leaching, Picea abies, Pinus sylvestris, Salix dasyclados, Salix viminalis, Vaccinium myrtillus
URN:NBN:urn:nbn:se:slu:epsilon-p-107991
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-107991
ID Code:17746
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Forest Soils (until 081001)
Deposited By: SLUpub Connector
Deposited On:07 Oct 2020 12:25
Metadata Last Modified:26 Oct 2020 14:02

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