Relations among soil microbial community composition, nitrogen turnover, and tree growth in N-loaded and previously N-loaded boreal spruce forest

Blaško, Róbert; Högberg, Peter; Bach, Lisbet Holm; Högberg, Mona N.

doi:10.1016/j.foreco.2013.02.035

Cited by 49 publications

(33 citation statements)

References 53 publications

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“…After ten years slight increases in mineralisation, immobilization and ammonium and microbial pool turnover rates were observed (Corre and Lamersdorf, 2004). Gross N mineralisation was investigated in a Norway spruce forest 17 and 19 years after 20 years of N addition at a rate of 73 and 108 kg N ha −1 yr − 1 respectively and no difference from control plots was observed (Blasko et al, 2013).…”

Section: Impacts Of N Reduction In Forestsmentioning

confidence: 99%

How long do ecosystems take to recover from atmospheric nitrogen deposition?

Stevens

2016

Biological Conservation

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Atmospheric nitrogen (N) deposition is a considerable threat to biodiversity and ecosystem function globally. Many experimental N additions and studies using gradients of ambient deposition have demonstrated impacts on plant species richness, diversity and composition in a broad range of habitats together with changes in soil biogeochemistry. In the last two decades levels of N deposition have begun to decline in some parts of Europe but it is currently difficult to assess the extent to which reductions in N deposition will result in recovery within seminatural habitats. There have been a number of investigations using the cessation of N additions in long-term experiments, monitoring in areas where ambient deposition has declined, transplants to situations with lower N inputs and roof experiments where rain is collected and cleaned. This review collates evidence from experiments in grasslands, forests, heathlands and wetlands where N additions have ceased or where N inputs have been reduced to assess how likely it is that habitats will recover from N deposition. The results of the majority of studies suggest that vegetation species composition, below-ground communities and soil processes may be slow to recover whereas some soil variables, such as nitrate and ammonium concentrations, can respond relatively rapidly to reductions in N inputs. There are a number of barriers to recovery such as continued critical load exceedance and lack of seed bank or local seed source, and there is the potential for vegetation communities to reach an alternative stable state where species lost as a consequence of changes due to N deposition may not be able to recolonise. In these cases only active restoration efforts can restore damaged habitats.

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Section: Impacts Of N Reduction In Forestsmentioning

confidence: 99%

How long do ecosystems take to recover from atmospheric nitrogen deposition?

Stevens

2016

Biological Conservation

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“…Inorganic N pools, gross and net N mineralisation We used the 15 N pool dilution method for estimating the gross N mineralisation rate (Kirkham and Bartholomew 1954;Hart et al 1994a) and followed the procedures described in Blaško et al (2013). To avoid contamination by N with unknown 15 N signature, we used acid washed equipment during analyses.…”

Section: Soil Sampling and Pre-treatmentmentioning

confidence: 99%

“…The filtrates were analyzed for NH 4 + and NO 3 − concentrations by flow injection analysis (FIAstar 5000, FOSS, Höganäs, Sweden). The micro diffusion technique was applied to transfer 14+15 NH 4 + from extracts to acidified paper disks (Stark and Hart 1996;Blaško et al 2013). Paper disks were dried and placed into tin capsules and analyzed in an elemental analyzer (Carlo Erba CHN 1110) coupled online to an isotope ratio mass spectrometer (EA-IRMS, Delta V, Thermo Fisher Scientific).…”

Section: Soil Sampling and Pre-treatmentmentioning

confidence: 99%

The return of an experimentally N-saturated boreal forest to an N-limited state: observations on the soil microbial community structure, biotic N retention capacity and gross N mineralisation

et al. 2014

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Background and aims To find out how N-saturated forests can return to an N-limited state, we examined the recovery of biotic N sinks under decreasing N supply. Methods . We studied a 40-year-old experiment in Pinus sylvestris forest, with control plots, N0, three N treatments, N1-N3, of which N3 was stopped after 20 years, allowing observation of recovery. Results In N3, the N concentration in foliage was still slightly elevated, but the N uptake capacity of ectomycorrhizal (ECM) roots in N3 was no longer lower than in N0. Per area the amount of a biomarker for fungi, here mainly attributed ECM, was higher in N3 and N0 than in N1 and N2. Retention of labeled 15 NH 4 + by the soil was greater in the control (99 %) and N3 (86 %), than in N1 (45 %) and N2 (29 %); we ascribe these differences to biotic retention because cation exchange capacity did not vary. Gross N mineralisation and retention of N correlated, negatively and positively, respectively, with abundance of ECM fungal biomarker. Conclusions . The results suggest a key role for ECM fungi in regulating the N cycle. We propose, in accordance with plant C allocation theory, that recovery is driven by increased tree below-ground C allocation to ECM roots and fungi.

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“…Root length of canola (Brassica campestris) was significantly increased when inoculated with endophytic bacterial strains selected from date palm (Phoenix dactylifera L.; Yaish et al, 2015); this confirmed the close relationship between root function and rhizosphere microbial community. Further, the stem wood production of Norway spruce (Picea abies L.) was correlated with soil microbial community composition that represents the mole percentage of fungi, bacteria and actinobacteria (Blaško et al, 2013). However, the direct influence of rhizosphere microorganisms on root respiratory metabolism has rarely been reported.…”

Section: Isolation Of Rhizospheric Bacteria and Seed Germination Expementioning

confidence: 99%

Effects of rhizobacteria on the respiration and growth of Cerasus sachalinensis Kom. seedlings

Qin

Zhou

et al. 2016

Span. j. agric. res.

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In this study, we investigated the influence of rhizosphere microorganisms on seed germination and root metabolism in Cerasus sachalinensis Kom. We inoculated C. sachalinensis plants with suspensions of dominant bacterial strains isolated from their rhizosphere. Four bacterial strains each with significant growth-promoting or growth-inhibiting effects were screened from the efficient root-colonizing microorganisms. The number of actinomycetes increased and that of fungi decreased significantly in the seedling rhizospheres after rhizobacteria treatment. The growth-promoting bacteria slightly affected the respiration rates and respiratory pathway enzymes, but significantly improved root viability, root carbohydrate concentration and seedling growth. Bacillus cereus, Staphylococcus sp. and Pseudomonas fluorescens were identified as the growth-promoting rhizobacteria; one strain could not be identified. After inoculation with the growth-inhibiting bacteria, the number of fungal colonies in the seedling rhizospheres increased and root viability and respiration rate as well as starch and sucrose accumulation in the roots significantly decreased. The glycolysis, pentose phosphate and alternative oxidase pathways became the major pathways of respiratory metabolism after inoculation with the growth-inhibiting bacteria. The height, leaf number, growth and dry weight of the seedlings decreased significantly in plants inoculated with the growth-inhibiting bacteria. Inoculation of C. sachalinensis rhizosphere with growth-promoting and growth-inhibiting bacteria affected the soil environmental factors such as microbial group composition, nutrient concentration and seedling biomass.

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Relations among soil microbial community composition, nitrogen turnover, and tree growth in N-loaded and previously N-loaded boreal spruce forest

Cited by 49 publications

References 53 publications

How long do ecosystems take to recover from atmospheric nitrogen deposition?

How long do ecosystems take to recover from atmospheric nitrogen deposition?

The return of an experimentally N-saturated boreal forest to an N-limited state: observations on the soil microbial community structure, biotic N retention capacity and gross N mineralisation

Effects of rhizobacteria on the respiration and growth of Cerasus sachalinensis Kom. seedlings

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