Long-term response of soil and stem wood properties to repeated nitrogen fertilization in a N-limited Scots pine stand

Smolander, Aino; Henttonen, Helena M.; Nöjd, Pekka; Soronen, Päivi; Mäkinen, Harri

doi:10.1007/s10342-022-01448-6

Cited by 15 publications

(9 citation statements)

References 61 publications

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“…An explanation for this could be that the low N availability is a limiting factor for bacteria in the control plots, and thus overrides the negative effect of tannins here. The lower soil tannin concentration in fertilized plots compared to control plots is in line with another boreal forest fertilization study (Smolander et al, 2022). Since N addition did not have any effect on the tannin concentration of leaves and needles, the lower soil tannin levels likely resulted from the decline in V. myrtillus abundance.…”

Section: Direct and Indirect Effects Of Fertilization On Dominating E...supporting

confidence: 85%

Condensed tannins mediate the effect of long-term nitrogen addition on soil nematodes in a boreal spruce forest

Tonjer

Nybakken

Birkemoe

et al. 2023

Preprint

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Fertilization and combustion have increased nitrogen (N) deposition over the last decades. Most boreal forests are N limited; thus, increased N availability may have considerable implications for boreal forest food web structure and functioning. Soil biota are important drivers of ecosystem processes through their effect on carbon (C) and nutrient cycling. Among these, nematodes are ubiquitous in soil and respond quickly to environmental changes. They are thus useful in determining changes in ecosystem status. Boreal forest plants produce large quantities of condensed tannins (hereafter tannins), and these may decrease following N addition. As defence compounds, tannins may alter soil community structure by reducing microbial activity and deter microfauna. Using nematodes as indicators, we here investigated the linkages between N-induced changes in soil food web and soil tannin concentration. We utilized a fertilization experiment where plots have been fertilized since 2003 at a rate of 150 kg ha− 1 yr− 1 in the form of granulated pellets containing 24.6% N, 2% P, 6% K and trace elements. This have resulted in a shift in the understory, and consequently a decrease in soil tannin concentration. Fertilization led to a less structured nematode community dominated by bacterivores. The abundance of bacterivores relative to fungivores increased, indicating a more bacteria-dominated energy channel. Furthermore, the dominance of bacteria appears to have been inhibited by soil tannin concentrations in the fertilized plots. Overall, our study demonstrate that soil community structure strongly changes upon increased N availability, and lower soil tannin concentrations further facilitate the dominance of bacteria.

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Section: Direct and Indirect Effects Of Fertilization On Dominating E...supporting

confidence: 85%

Condensed tannins mediate the effect of long-term nitrogen addition on soil nematodes in a boreal spruce forest

Tonjer

Nybakken

Birkemoe

et al. 2023

Preprint

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“…The short-term effect of nitrogen on the anatomical properties of poplar wood has been confirmed in the literature [ 38 , 40 ] and in this research. The long-term response to growth was detected after intensive and repeated nitrogen fertilisation [ 49 ]. Although fertilisation can improve growth and affect wood properties, its effect on tree growth is not long lasting and requires repeated fertilisation treatments [ 26 ].…”

Section: Discussionmentioning

confidence: 99%

“…Usually, the response to treatment is found in the year following fertilisation or in the year of re-fertilisation [ 49 ]. Significant effects up to four years might be expected [ 36 ] but in continuation over the years.…”

Section: Discussionmentioning

confidence: 99%

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The Effects of Nitrogen Fertilisation on the Anatomical Properties of the Populus alba L. Clone ‘Villafranca’ Juvenile Wood

Ištok

Potočić

Šefc

et al. 2022

Biology

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This study investigates the effect of nitrogen fertilisation on the anatomical properties of the juvenile wood of the Populus alba L. clone ‘Villafranca’ from an experimental trial near the Drava River in Croatia. Nitrogen was applied for two consecutive years, and the immediate and potential post-treatment effects were investigated. The correlation between annual ring width (ARW) and individual wood anatomical properties was also examined. The fertilisation effect was confirmed after the first year of nitrogen application for all wood anatomical properties except the vessel lumen area (VLA). Fibre length (FL) was reduced, and double cell wall thickness (DCWT), ray area (RA), and cell wall area (CWA) increased. In contrast, the vessel lumen diameter (VLD) and vessel lumen area changed inconsistently between treatments. The second year of nitrogen application was determined to be effective for FL only. Due to the insignificant results in the second year of the application of nitrogen, the post-fertilisation effect of nitrogen fertilisation was not confirmed.

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“…In the 1980's areas decreased and by the 1990's, annual fertilization areas were very low. Interest towards forest fertilization is increasing again since fertilization is considered as an efficient tool to enhance the production of renewable resources and increase C sequestration (Hedwall et al 2014;Saarsalmi and Mälkönen 2001;Smolander et al 2022).…”

Section: And N Cycling In Forest Soilsmentioning

confidence: 99%

Bioenergy from forests: Impact of logging residues on the carbon and nitrogen cycles

Törmänen¹

2022

Diss. For.

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Sustainable forest management practices are crucial for minimizing environmental impacts, and to keep forests and the underlying soils healthy to maintain productivity, and to improve adaptability to climate change and mitigate it in the long-term. There, carbon and nitrogen cycling play crucial roles in proper functioning of forest ecosystems. The overall aim of this thesis was to explore the effects of logging residues on the early-stage dynamics of the main nitrogen and carbon cycling processes in upland forest soils after final felling. A specific aim was to compare the effects of logging residue piles consisting of different tree species, i.e., Scots pine (Pinus sylvestris L.), Norway spruce (Picea abies (L.) Karst.), and silver birch (Betula pendula Roth). A special attention was given to the response of soil to different amounts of residues. The effect of logging residues on soil chemical properties and processes was stronger in the organic layer than in the mineral soil layer. Logging residue piles stimulated carbon and nitrogen cycling, especially net nitrification within the first year after the residue treatment. Subsequently, nitrogen was lost via leaching as nitrate and gaseous emission as nitrous oxide. Nitrous oxide fluxes were generally low, although higher in the plots containing logging residues. Spruce residues tended to stimulate nitrous oxide emissions for longer than the residues of the other tree species. Depending on the tree species, nitrous oxide production originated from both autotrophic nitrification and denitrification. Nitrogen concentrations in the soil percolate water already accelerated one year after the establishment of the residue piles. Logging residues increased nitrate and ammonium concentrations, which were highest under birch residues. The effect of logging residue piles on soil was stronger when compared to milder tree species effects. Biological nitrogen fixation activity tended to be higher in branches than in needles or leaves, and higher in coniferous residues. The results of this study raise the importance of more even distribution of logging residues on the forest floor instead of piling them to avoid harmful environmental effects and to maintain soil nutrient balance. The ability of soils to retain nitrogen needs additional attention in forest management practices, especially in boreal areas where nitrogen limits the growth of forests.

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Long-term response of soil and stem wood properties to repeated nitrogen fertilization in a N-limited Scots pine stand

Cited by 15 publications

References 61 publications

Condensed tannins mediate the effect of long-term nitrogen addition on soil nematodes in a boreal spruce forest

Condensed tannins mediate the effect of long-term nitrogen addition on soil nematodes in a boreal spruce forest

The Effects of Nitrogen Fertilisation on the Anatomical Properties of the Populus alba L. Clone ‘Villafranca’ Juvenile Wood

Bioenergy from forests: Impact of logging residues on the carbon and nitrogen cycles

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