The distribution of nematodes and soil microbial communities across soil aggregate fractions and farm management systems

Briar, Shabeg S.; Fonte, Steven J.; Park, Inmyoung; Six, Johan; Scow, Kate M.; Ferris, H.

doi:10.1016/j.soilbio.2010.12.017

Cited by 176 publications

(95 citation statements)

References 50 publications

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“…Evaluation of trophic levels of nematodes, the data showed that the dominant nematode trophic groups in the intercropping system were bacterial feeding and plant feeding nematodes. These results could be explained by the fact that bacterial feeding nematodes are the most abundant soil nematodes and were positively correlated with water availability [50]. This result is in line with [12] who found a high sensitivity of bacterial-feeding nematodes to drought.…”

Section: Discussionsupporting

confidence: 81%

Impact of Simulated Drought Stress on Soil Microbiology, and Nematofauna in a Native Shrub + Millet Intercropping System in Senegal

Diakhaté¹,

Badiane-Ndour²,

Founoune-Mboup³

et al. 2016

OJSS

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Drought stress strongly affects soil biota and impairs crop production, which under climate change will be exacerbated in semi-arid cropping regions such as the Sahel. Hence soil management systems are needed that can buffer against drought. In West Africa, field studies have found intercropping of millet with the native shrub Piliostigma reticulatum improves soil-plant-water relations, microbial activity and diversity, and suppress parasitic nematodes, which can significantly increase crop yield. However, little information is available on its beneficial or negative effects on soils or crops during water stress. Therefore, the objective was to investigate the impact of P. reticulatum in moderating water stress effects on soil properties and pearl millet (Pennisetum glaucum [L.] R. Br.) productivity. In the greenhouse, soil chemical and microbial properties and millet growth were investigated with a factorial experiment of varying levels of soil moisture (favorable, moderately stressed, or severely stressed water conditions) that was imposed for 55 days on soils containing sole P. reticulatum or millet, or millet + P. reticulatum. The results showed that the presence of P. reticulatum did not buffer soils against water stress in relation to soil chemical and microbial properties measured at the end of the experiment. Severe water stress did significantly decrease the height, number of leaves, and aboveground biomass of millet plants. Additionally, respiration, nematofauna trophic structure and abundance decreased as water stress increased. Lastly, bacterial feeders and plant parasitic 190nematodes were the most sensitive to severe water stress while fungal feeding nematodes remained unaffected. The results suggested that the intensity of water stress had more negative effects on soil basal respiration rather than soil microbial biomass.

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Section: Discussionsupporting

confidence: 81%

Impact of Simulated Drought Stress on Soil Microbiology, and Nematofauna in a Native Shrub + Millet Intercropping System in Senegal

Diakhaté¹,

Badiane-Ndour²,

Founoune-Mboup³

et al. 2016

OJSS

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“…Sandy soil amended with varying proportion of plant litter capable of maintaining a high number of nematodes (50-102 individuals.g -1 soil). This abundance was greater than that reported by Briar et al (2011) who observed abundance of 18-24 individuals.g -1 soil with large macro-aggregates. Our greenhouse experiments with plant litter amendment also supported more nematode than organic farming soil with 30 individuals.g -1 (Briar et al, 2007) The different proportion of plant litter did not coincide with changes in functional groups or nematode families.…”

Section: R E S U L T S a N D Discussioncontrasting

confidence: 74%

Nematode Community Response to Varied Proportion of Decomposing Plant Litter

2017

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A B S T R A C TThe research objectives were to investigate nematode community response to decomposing plant litter of varying proportions, and to measure the litter decomposition rate. This greenhouse experiments included three treatments of decomposing plant litter with proportions of 30:70, 50:50, and 70:30 (leaf litter to stem-paddy litter, weight to weight), and two controls (commercial organic fertilizers and no-organic matter). We applied the prepared plant litter and organic fertilizers on the surface of the agricultural sandy soil. Soil samples were taken after two, seven, 14, 28, 49, and 77 days to follow nematode temporal changes. Nematodes were assigned to functional groups and family level of a taxon. We used Anova to test the significance of nematode abundance among the treatments, exponential decay model to measure decomposition rates of the plant litter, and canonical correspondence analysis to investigate the correlation of varying plant proportion and nematode community composition. The results showed that nematode functional groups and family did not differ among soils of various plant litter proportions. Bacterivorous Rhabditidae and Cephalobidae, fungivorous Aphelenchidae, and fungivorous-root feeder Tylenchidae inhabited plant litter amended soils. Their abundance, however, differed significantly (p<0.001) and revealed two temporal patterns, i.e., linear (50:50) and unimodal (30:70 and 70:30). No nematodes were observed in organic fertilizer amended soil and no-organic matter soil. Nematode community composition changed over time according to the litter proportion, in which by the end of experiments, community of 50:50 and 30:70 were the least similar (r: 0.57 of axis-1 and 0.54 of axis-2, CPV: 89.06). We concluded that all litter proportions retained similar quality and supported the growth of similar nematode groups. The litter proportion, however, appeared to influence nematode abundance, their temporal patterns, and community compositions.KEY WORDS: plant litter proportion, decomposition rate, nematode community, nematode temporal patterns Corresponding author: ARDHINI R MAHARNING |

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“…The soil microbial community was characterized using phospholipid fatty acids (PLFAs) analysis as described by Bossio and Scow (1998) and Briar et al (2011). Lipids were extracted from 8 g of freeze-dried soil using a chloroform-methanol-citrate buffer mixture (1:2:0.8).…”

Section: Plfa and Protozoa Analysismentioning

confidence: 99%

Conservation tillage positively influences the microflora and microfauna in the black soil of Northeast China

Zhang

Lü

et al. 2015

Soil and Tillage Research

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The distribution of nematodes and soil microbial communities across soil aggregate fractions and farm management systems

Cited by 176 publications

References 50 publications

Impact of Simulated Drought Stress on Soil Microbiology, and Nematofauna in a Native Shrub + Millet Intercropping System in Senegal

Impact of Simulated Drought Stress on Soil Microbiology, and Nematofauna in a Native Shrub + Millet Intercropping System in Senegal

Nematode Community Response to Varied Proportion of Decomposing Plant Litter

Conservation tillage positively influences the microflora and microfauna in the black soil of Northeast China

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