Soil bacteria and nematode functional diversity: A comparison across vegetation types

Maharning, Ardhini Rin; Widyastuti, Ani; Pratiwi, Meyta

doi:10.1063/1.4953478

Cited by 2 publications

(2 citation statements)

References 14 publications

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“…F I G U R E 6 The discriminating bacteria among soils with different salinities [Colour figure can be viewed at wileyonlinelibrary.com] Furthermore, salinity is known to determine the distribution pattern of vegetation (Herbert et al, 2015). Soil salinization would greatly influence vegetation types, which could shape bacterial community through their different life history (Maharning, Widyastuti, & Pratiwi, 2016). Therefore, the different vegetation types in LSW, MSW and HSW might be a reason for different bacterial community compositions.…”

Section: Discriminating Bacteria In Soils With Different Salinitiesmentioning

confidence: 99%

Shifts in the soil bacterial community along a salinity gradient in the Yellow River Delta

et al. 2020

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Soil salinization has rapidly encroached from the coastline to inland areas over the past two decades in the Yellow River Delta (YRD). Soil samples were collected from low-(LSW), medium-(MSW), and high-(HSW) salinity wetlands at a depth of 0-20 cm for 16S rRNA sequencing and bioinformatic analyses. The richness and α-diversity indices were significantly lower in saline soils (ECe > 15 dS/m, HSW) than in soils those were not saline (ECe < 15 dS/m, LSW and MSW) (p < 0.05), generally showing a decreasing trend with increasing salinities. The phyla, Proteobacteria, Bacteroidetes, Chloroflexi, Acidobacteria and Planctomycetes, represented more than 70% of the bacterial community in the three wetlands, indicating the wide adaption of these phyla to salinity changes. Specifically, Proteobacteria was recognized as the most dominant (35.30%-38.59%) phylum regardless of salinity. Furthermore, bacterial composition was different among the wetlands, as revealed by β-diversity indices and analysis of similarities. Linear discriminant analysis (LDA) effect size revealed the presence of 11, 2, and 10 discriminating bacterial taxa (LDA > 4) among LSW, MSW, and HSW, respectively, implying that they can serve as bioindicators of soil salinization. Redundancy analysis, Spearman correlation analysis, and the Mantel test suggested that salinity parameters (EC, Na + , K + , Mg 2+ , Ca 2+ , Cl − , and SO 4 2−) prominently structured the bacterial community in the current study. These results suggest that the changes of bacterial composition would be induced in these LSW and MSW soils once seawater intrusion occurs.

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Section: Discriminating Bacteria In Soils With Different Salinitiesmentioning

confidence: 99%

Shifts in the soil bacterial community along a salinity gradient in the Yellow River Delta

et al. 2020

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“…Two types of bacteria were added to the microcosm to enhance the soil community. Their selection was based on our previous research to which the bacteria have consistently thrived in the soil planted with various vegetation and during drought treatments (Maharning et al 2016). Their survival has potential for enhancement agents.…”

Section: Bacterial Enhancementmentioning

confidence: 99%

Bacterial (9A2H) enhancement alters the nematode community structure and decomposition pathway of amended nutrient-limited soil

2020

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Abstract. Luckyana DR, Puspitasari IGAAR, Maharning AR. 2020. Bacterial (9A2H) enhancement alters the nematode community structure and decomposition pathway of amended nutrient-limited soil. Biodiversitas 21: 4813-4820. This study examined the influence of paddy litter amendment and bacterial enhancement of nutrient-limited soil on the nematode community structure and investigated the decomposition rate of the litter due to the treatment. We applied a microcosm-based approach using sand as the medium, including the following treatments: no-bacteria, 9A-autotrophic-bacteria, 2H-heterotrophic-bacteria, and 9A-2H-mix-bacteria, with five replicates. The litter bag experiment and exponential decay model estimated the litter decomposition rate in the microcosm. The soil samples and litter bags were retrieved after days 21, 42, and 63. The structure, enrichment, channel index (CI), and canonical correspondence analysis were employed to investigate the nematode community response. Bacterial enhancement shifted the nematode community and the soil food web toward the dominant bacterial pathway by day 63 (CI: 0), with a slightly less structured food web that was supported by bacterivorous nematodes mostly related to available nutrients. These changes coincided with soil organic carbon and nitrogen increases over time. Our experiments showed that paddy litter amendment and the 9A, 2H, and 9A-2H-mix bacterial enhancements improved nutrient-limited soil, according to the analysis of the nematode community, its composition, and the food web conditions determining nutrient mobility and availability. However, these factors have no impact on the litter decay rate.

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Soil bacteria and nematode functional diversity: A comparison across vegetation types

Cited by 2 publications

References 14 publications

Shifts in the soil bacterial community along a salinity gradient in the Yellow River Delta

Shifts in the soil bacterial community along a salinity gradient in the Yellow River Delta

Bacterial (9A2H) enhancement alters the nematode community structure and decomposition pathway of amended nutrient-limited soil

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