Effects of common oak (Quercus robur L.) defolition on the soil properties of an oak forest in Western Plain of Romania

Oneţ, Aurelia; Teușdea, Alin Cristian; Boja, N.; Domuța, C.; Oneţ, C.

doi:10.15287/afr.2016.544

Cited by 6 publications

(8 citation statements)

References 20 publications

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“…Consequently, studying the effects of chemical/organic fertilizers on the natural microbial community is of crucial importance. For example, understanding how NPK chemical fertilizers influence the microbial biomass, which is an indicator of soil fertility and quality, is a basic prerequisite for understanding microbiological processes [63], in order to preserve the ecosystem functions of soil.…”

Section: Biosolidsmentioning

confidence: 99%

Fertilization and Soil Microbial Community: A Review

et al. 2022

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The present paper reviews the most recent advances regarding the effects of chemical and organic fertilizers on soil microbial communities. Based on the results from the articles considered, some details are presented on how the use of various types of fertilizers affects the composition and activity of soil microbial communities. Soil microbes have different responses to fertilization based on differences in the total carbon (C), nitrogen (N) and phosphorus (P) contents in the soil, along with soil moisture and the presence of plant species. These articles show that the use of chemical fertilizers changes the abundance of microbial populations and stimulates their growth thanks to the nutrient supply added. Overall, however, the data revealed that chemical fertilizers have no significant influence on the richness and diversity of the bacteria and fungi. Instead, the abundance of individual bacterial or fungal species was sensitive to fertilization and was mainly attributed to the changes in the soil chemical properties induced by chemical or organic fertilization. Among the negative effects of chemical fertilization, the decrease in enzymatic activity has been highlighted by several papers, especially in soils that have received the largest amounts of fertilizers together with losses in organic matter.

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Section: Biosolidsmentioning

confidence: 99%

Fertilization and Soil Microbial Community: A Review

et al. 2022

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“…While bacterial growth decreases following N fertilization or N deposition owing to C limitation (e.g., References [14,15]), the input of labile C compounds increases bacterial and fungal populations [6,16]. For example, oak (Quercus robur L.) defoliation by the gypsy moth (Lymantria dispar L.) led to increased populations of fungi and N 2 -fixing bacteria in soil [17]. Increased populations of culturable fungi and Actinobacteria were found in pine forests (Pinus sylvestris L.) defoliated by the pine beauty moth (Panolis flammea D. et S.) and the pine-tree lappet (Dendrolimus pini L.) [6].…”

Section: Introductionmentioning

confidence: 99%

The Abundance of Fungi, Bacteria and Denitrification Genes during Insect Outbreaks in Scots Pine Forests

Grüning

Beule

Meyer

et al. 2018

Forests

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Abstract:Outbreaks of defoliating insects may affect microbial populations in forests and thereby mass balances and ecosystem functioning. Here, we investigated the microbial dynamics in Scots pine (Pinus sylvestris L.) forests during outbreaks of the nun moth (Lymantria monacha L.) and the pine-tree lappet (Dendrolimus pini L.). We used real-time PCR (polymerase chain reaction) to quantify genes that characterize bacterial and fungal abundance and the denitrification processes (nirK, nirS, nosZ clades I and II) in different forest compartments and we analyzed the C and N content of pine needles, insect feces, larvae, vegetation layers, organic layers, and mineral soil horizons. The infestation of the nun moth increased the bacterial abundance on pine needles, in the vegetation layer, and in the upper organic layer, while fungal populations were increased in the vegetation layer and upper organic layer during both outbreaks. In soil, the abundance of nirK increased after insect defoliation, while the C/N ratios decreased. nosZ clades I and II showed variable responses in different soil layers and to different defoliating insects. Our results illustrate changes in the microbial populations in pine forests that were infested by defoliating insects and changes in the chemical soil properties that foster these populations, indicating a genetic potential for increased soil N 2 O emissions during the defoliation peak of insect outbreak events.

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“…Along with a change in vegetation regeneration in the defoliated forest, a decrease in root biomass and root exudates of labile C in the topsoil can also shift the microbial communities associated with roots, as illustrated by a negative correlation between herbivory and ectomycchorizal fungi abundance [13,60]. Other studies have suggested higher soil acidity [27] or lower C: N ratio in the litterfall [17] could increase fungal biomass in topsoil under defoliated trees compared to undefoliated trees, but our fungal ratio indicator remained constant between undefoliated and defoliated sites. This possible change in forest regeneration at our site favouring balsam fir over trembling aspen may also have consequences for soil micronutrients.…”

Section: Discussionmentioning

confidence: 99%

“…For example, Castaño et al (2020) found a decrease in soil fungal biomass associated with a decrease in root exudates after an outbreak by the pine processionary moth. In lab cultures, Oneț et al (2016) found an increase in fungi and a decrease in heterotrophic bacteria from soils sampled under oaks defoliated by spongy moth and attributed them to higher pH and changes in soil chemistry.…”

Section: Introductionmentioning

confidence: 99%

Decreased Soil Microbial Biomass and Changed Microbial Community Composition Following a Defoliation Event by the Forest Tent Caterpillar

Dansereau¹,

Despland²,

Handa³

2023

Preprint

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With climate change projected to increase the frequency and severity of episodic insect outbreak events, assessing potential consequences for soil microbial communities and nutrient dynamics is of importance for understanding forest resilience. The forest tent caterpillar (Malacosoma disstria) is an important defoliator of deciduous tree species in temperate and mixed forests of eastern North America with an invasion cycle every 10-12 years and outbreak events that can last 3-6 years. Following a defoliation episode on trembling aspen (Populus tremuloides) from 2015 to 2017 in Abitibi-Témiscamingue, QC, Canada, we sought to test if defoliation resulted in changes to soil bacterial and fungal communities. We hypothesized an increase in soil microbial biomass due to increased caterpillar frass inputs and potential changes in community structure following the event. Soils were sampled in July 2018, May 2019 and July 2019 from sites that had been subject to defoliation during the outbreak and from sites where no defoliation had been recorded. We assessed soil microbial biomass and fungal to total microbial activity ratio on all sampling dates, and Community Level Physiological Profiles (CLPPs) for 2018 only using a substrate induced respiration method. Contrary to our hypothesis, we observed a significant 50% decrease in microbial biomass (g biomass-C g-1 soil hour-1) in defoliated stands suggesting tree carbon normally allocated towards root exudates was reallocated towards foliage regeneration. We noted a differentiated carbon-based substrate usage following defoliation, but no change in the fungal to total microbial activity ratio. The observed changes in the two years following the defoliation event suggest that defoliation episodes aboveground could trigger changes in soil chemistry belowground with effects on soil microbial communities that may, in turn, feedback to influence forest plant dynamics.

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Effects of common oak (Quercus robur L.) defolition on the soil properties of an oak forest in Western Plain of Romania

Cited by 6 publications

References 20 publications

Fertilization and Soil Microbial Community: A Review

Fertilization and Soil Microbial Community: A Review

The Abundance of Fungi, Bacteria and Denitrification Genes during Insect Outbreaks in Scots Pine Forests

Decreased Soil Microbial Biomass and Changed Microbial Community Composition Following a Defoliation Event by the Forest Tent Caterpillar

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