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Plant Diversity Increased Arthropod Diversity and Crop Yield in Traditional Agroforestry Systems but Has No Effect on Herbivory

Author

Listed:
  • Daniel K. N’Woueni

    (Faculty of Agronomy, University of Parakou, Parakou 01 BP 123, Benin)

  • Orou G. Gaoue

    (Faculty of Agronomy, University of Parakou, Parakou 01 BP 123, Benin
    Department of Ecology Evolutionary Biology, University of Tennessee Knoxville, Knoxville, TN 37996, USA
    Department of Geography, Environmental Management and Energy Studies, University of Johannesburg, Auckland Park Campus, Johannesburg 2006, South Africa)

Abstract

Improving agricultural production in response to the increasing food demand remains a major challenge in agroecology. The world has made significant efforts to meet this issue by developing several cultivation techniques, such as the use of chemical fertilizers and arable land conversion into agricultural land. However, most of these techniques have caused a significant loss of biodiversity and ecosystems services. Recent data suggest that biological conservation within and around agroforestry systems are potential solutions that can both reduce biodiversity loss and guarantee crop production. This logic is based on the hypothesis that increasing plant diversity in and around agricultural systems can limit the pest attack rate and increase crop yield. We tested this hypothesis using structural equation modeling on empirical data collected in agroforestry systems around the Pendjari biosphere reserve in West Africa. We measured crop diversity, crop yield, arthropod pest diversity, abundance, the rate of crop herbivory, and the diversity of plants in surrounding natural vegetation in 32 permanent plots. We estimated arthropod diversity and abundance using pitfall traps. We found a direct positive effect for plant diversity and a direct negative effect of arthropod herbivory on crop yield. The diversity of plants in surrounding natural vegetation had a direct positive effect on arthropod pest diversity but a marginal negative direct effect on the rate of crop herbivory. We found no significant direct or indirect effect for crop diversity. Our findings underline the important role of biodiversity conservation in agricultural production improvement. We suggest that the conservation of plant diversity around agroforestry systems may be an effective option to control herbivory damage. Its combination with other pest control techniques may further limit crop depredation and ensure the long-term conservation of wildlife.

Suggested Citation

  • Daniel K. N’Woueni & Orou G. Gaoue, 2022. "Plant Diversity Increased Arthropod Diversity and Crop Yield in Traditional Agroforestry Systems but Has No Effect on Herbivory," Sustainability, MDPI, vol. 14(5), pages 1-11, March.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:5:p:2942-:d:763036
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    References listed on IDEAS

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