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The effect of phosphorus addition, soil moisture, and plant type on soil nematode abundance and community composition

  • Olusanya Abiodun Olatunji
  • Shanxing Gong
  • Akash Tariq
  • Kaiwen Pan
  • Xiaoming Sun
  • Wenkai Chen
  • Lin Zhang
  • Mohammed A. Dakhil
  • Dan Huang
  • Xue Tan
Soils, Sec 1 • Soil Organic Matter Dynamics and Nutrient Cycling • Research Article

Abstract

Purpose

Environmental variables such as soil moisture and phosphorus (P) might influence above- and below-ground biodiversity. In this study, we investigated the rarely reported individual and interactive multifactor effects of soil moisture and phosphorus addition with the type of above-ground tree species (biological interactions) on the soil nematode community structure.

Materials and methods

We established a completely randomized experimental design with two plant types (N2-fixer and non-nitrogen fixer) and different combinations of water treatments and P additions (i.e., water with P addition, water only, drought with P addition, and drought only) in a greenhouse and investigated their effects on the soil chemical properties and nematode community. Soil samples were collected at the end of the experiment and were analyzed for soil moisture content (SM), available phosphorus (aP), nitrate nitrogen (NO3–N), ammonium nitrogen (NH4+–N), dissolved organic carbon (DOC), dissolved organic nitrogen (DON), and nematode community. The following trophic groups were assigned to the nematodes: bacterivores (Ba), fungivores (Fu), omnivores–predators (Op), and plant parasites (PP). The channel index (CI), enrichment index (EI), maturity index (MI), genus richness (GR), and Simpson dominance (Ig) were adopted to indicate the indices of the nematode food web.

Results and discussion

Phosphorus addition and its interaction with water treatments had no statistically significant effects on the soil nematode community, but there were significant decreasing (p < 0.05) effects of P addition on the total density of nematodes of the N2-fixing tree under optimum water treatment. There were no significant interactive effects of P addition and water treatments on all the trophic groups, but plant type, water treatments, and their interactions significantly affected the density of most nematode trophic groups. The total nematode abundances of bacterivores, plant parasitic, omnivores, and enrichment index were significantly higher in the N2-fixers than in the non-nitrogen-fixing tree.

Conclusions

Soil nematode abundance and community composition were more affected by the plant type than by the P addition and its interaction with water treatments. Drought exerted adverse effects on the total density of soil nematodes, the dominant genera, and the trophic groups. This study demonstrated that the rate of drought impact hinges more on the type of tree and that N2-fixing tree could still maintain the soil food web structure irrespective of the environmental changes.

Keywords

Biodiversity Drought Phosphorus Microfauna Nitrogen Nematodes 

Notes

Acknowledgments

O.A OLATUNJI thankfully acknowledges the Chinese Academy of Sciences and the World Academy of Sciences (CAS-TWAS) for the fellowship.

Funding

This study was supported by the National Key Research and Development Program of China (Grant Nos. 2016YFC0502101 and 2017YFC0505000), the Ministry of Sciences and Technology of China (Grant No. 2015BAD07B050304), and the National Natural Science Foundation of China (Grant Nos. 31370632 and 31500517).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

11368_2018_2146_MOESM1_ESM.docx (28 kb)
ESM 1 (DOCX 27 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Olusanya Abiodun Olatunji
    • 1
    • 2
  • Shanxing Gong
    • 1
  • Akash Tariq
    • 1
    • 2
  • Kaiwen Pan
    • 1
  • Xiaoming Sun
    • 1
  • Wenkai Chen
    • 1
  • Lin Zhang
    • 1
  • Mohammed A. Dakhil
    • 1
    • 2
    • 3
  • Dan Huang
    • 1
    • 2
  • Xue Tan
    • 1
    • 2
  1. 1.Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of BiologyChinese Academy of SciencesChengduPeople’s Republic of China
  2. 2.University of Chinese Academy of SciencesBeijingPeople’s Republic of China
  3. 3.Botany and Microbiology department, Faculty of ScienceHelwan UniversityCairoEgypt

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