Quantifying the influences of free-living nematodes on soil nitrogen and microbial biomass dynamics in bare and planted microcosms

Gebremikael, Mesfin Tsegaye; Buchan, David; Neve, Stefaan De

doi:10.1016/j.soilbio.2013.12.006

Cited by 38 publications

(21 citation statements)

References 53 publications

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“…Although there was evidence of enrichment, as visualized by the enrichment and the faunal profiles, the selective amplification of economically important PPNs was not detected by the community-level indices (also noted by Berkelmans et al, 2003). The decline in the PPI observed in our data (Table 3) would create the impression among tomato producers that their "nature-friendly" production system was effective in reducing the PPN threat because herbivores numbers usually increase in tomato production systems over time (Bulluck et al, 2002;Gebremikael et al, 2014). However, the increase in Paratrichodorus spp.…”

Section: Ncp In Perspectivementioning

confidence: 59%

“…The presence/absence of plants was the primary distinguishing factor between nematode community profiles of different land uses (Gebremikael et al, 2014). In our study, the land use gradient described a change in plant populations from natural grasslands, to bare soil and then to a non-indigenous cultivated plant, the tomato.…”

Section: Ncp In Perspectivementioning

confidence: 75%

“…Although this study highlighted the usefulness of community-level functionality metrics, its limitations were also observed. For example, biological nitrogen supply cannot be inferred from FLN numbers when a plant is present in the soil (Carrascosa et al, 2014;Gebremikael et al, 2014). Although there was evidence of enrichment, as visualized by the enrichment and the faunal profiles, the selective amplification of economically important PPNs was not detected by the community-level indices (also noted by Berkelmans et al, 2003).…”

Section: Ncp In Perspectivementioning

confidence: 99%

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Nematode community profiling as a soil biology monitoring tool in support of sustainable tomato production: A case study from South Africa

Malherbe

Marais

2015

Applied Soil Ecology

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Management of the biological component of agricultural soils is a vital aspect of sustainable food production systems. There is a need for soil biology metrics that producers can use as a decision support tool when it comes to managing the soil biological component of agricultural soils. We evaluated the usefulness of nematode community profiling as a soil biology monitoring tool in support of a sustainable commercial-scale tomato production system in South Africa. The objectives were to: 1) study the effects of land use change on nematode communities in the tomato production region, and 2) explore the correlation between tomato crop productivity and the nematode community metrics. The enrichment index was a sensitive indicator of land use change, but the structure index was not. Although the number and proportion of free-living and plant-parasitic nematodes increased and decreased respectively, the selective amplification of specific herbivorous genera was observed.Helicotylenchus spp. was sensitive to land use change and might serve as soil health indicator in this tomato production region. Regression analysis indicated a combination of variables associated with soil pH, free-living nematodes (notably the bacterivores) and specific plant-parasitic nematode genera (Paratrichodorus spp. and Rotylenchus spp.) predictedtomato yield (R 2 = 0.846). Despite the useful information gleaned from the nematode community metrics regarding soil food web functioning, the importance of ecologically and economically important nematode genera was re-emphasized. The results of this study highlight an important principle regarding development of soil health metrics for tomato agroecosystems: tomato crop health was not necessarily predicted solely by indicators of soil food web health and functioning.

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Section: Ncp In Perspectivementioning

confidence: 59%

Section: Ncp In Perspectivementioning

confidence: 75%

Section: Ncp In Perspectivementioning

confidence: 99%

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Nematode community profiling as a soil biology monitoring tool in support of sustainable tomato production: A case study from South Africa

Malherbe

Marais

2015

Applied Soil Ecology

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“…When the entire nematode community was considered in soils without additional OM, the effect on N uptake2324 was not significant. Here, in line with our hypothesis, interactions between nematodes, microbes and plants increased net N (+25%) and net P (+23%) availability and subsequent plant growth (+9%), demonstrating tangible effects of nematodes on nutrient mobilization under C-and N-rich conditions, which is often the case in agricultural ecosystems where the application of nutrient-rich organic amendments is a common practice.…”

Section: Discussionmentioning

confidence: 94%

Nematodes enhance plant growth and nutrient uptake under C and N-rich conditions

Gebremikael¹,

Steel

Buchan³

et al. 2016

Sci Rep

Self Cite

161

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The role of soil fauna in crucial ecosystem services such as nutrient cycling remains poorly quantified, mainly because of the overly reductionistic approach adopted in most experimental studies. Given that increasing nitrogen inputs in various ecosystems influence the structure and functioning of soil microbes and the activity of fauna, we aimed to quantify the role of the entire soil nematode community in nutrient mineralization in an experimental set-up emulating nutrient-rich field conditions and accounting for crucial interactions amongst the soil microbial communities and plants. To this end, we reconstructed a complex soil foodweb in mesocosms that comprised largely undisturbed native microflora and the entire nematode community added into defaunated soil, planted with Lolium perenne as a model plant, and amended with fresh grass-clover residues. We determined N and P availability and plant uptake, plant biomass and abundance and structure of the microbial and nematode communities during a three-month incubation. The presence of nematodes significantly increased plant biomass production (+9%), net N (+25%) and net P (+23%) availability compared to their absence, demonstrating that nematodes link below- and above-ground processes, primarily through increasing nutrient availability. The experimental set-up presented allows to realistically quantify the crucial ecosystem services provided by the soil biota.

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“…BP represents the soil before adding the Camellia cake. Gebremikael et al (2014). However, the plant-parasites nematodes, especially Meloidogyne spp., showed negative correlations with both bacteria and fungi biomass from day 20 to the end, though the correlations between the Meloidogyne and soil fungal biomass was not significant after 30 days.…”

Section: Discussionmentioning

confidence: 99%

Exploring patterns ofCamelliaseed cake application in relation to plant growth, soil nematodes and microbial biomass

Yang

Xue

et al. 2018

Soil Science and Plant Nutrition

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The suppression of plant-parasitic nematodes is crucial for maintaining the worldwide development of the banana industry. In this study, different application patterns of Camellia seed cake previously reported to suppress root-knot nematode were conducted to manage pests and promote banana seedling growth. The results demonstrated seven days delay before transplanting was necessary after Camellia seed cake application. The dose 5 g/kg soil resulted in best plant growth promotion performance, which increased banana seedling height, stem diameter, shoot, and root fresh weight by upto 29%, 27%, 47%, and 21%, respectively. Plastic film mulching was beneficial when high amount (2%) of Camellia seed cake was added. The application of Camellia seed cake increased nutrient potassium amounts; the abundance of soil free-living nematodes, especially bacterivores; and the abundance of soil microbes and the soil catalase activity, while reduced plant-parasitic nematodes amounts. Further correlation analysis between the soil nematodes and microbial abundance showed that plant-parasite numbers had significant negative correlations with the bacterial biomass and a portion of the fungal biomass; bacterivores had significant positive correlations with the bacterial biomass; and omnivores had significant correlations with the bacterial biomass and fungal biomass. A fundamental challenge of root-knot nematode control is to sustain ecological services without losing biodiversity. This study provided an environmentally friendly strategy based on Camellia seed cake to regulate the soil health and quality. ARTICLE HISTORY

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Quantifying the influences of free-living nematodes on soil nitrogen and microbial biomass dynamics in bare and planted microcosms

Cited by 38 publications

References 53 publications

Nematode community profiling as a soil biology monitoring tool in support of sustainable tomato production: A case study from South Africa

Nematode community profiling as a soil biology monitoring tool in support of sustainable tomato production: A case study from South Africa

Nematodes enhance plant growth and nutrient uptake under C and N-rich conditions

Exploring patterns ofCamelliaseed cake application in relation to plant growth, soil nematodes and microbial biomass

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