Biodiv Sci ›› 2024, Vol. 32 ›› Issue (7): 24040.  DOI: 10.17520/biods.2024040

• Original article • Previous Articles     Next Articles

Effects of annual and perennial potted legume forages on soil nematode communities in the Qinghai-Xizang Plateau

Yixin Sun(), Chunyu Hou, Lei Zhou, Xue Wei(), Jinhao Ma(), Juan Xue, Xiaohan Li(), Pengfei Wu*()()   

  1. College of Grassland Resource, Southwest Minzu University, Chengdu 610225, China
  • Received:2024-01-29 Accepted:2024-05-20 Online:2024-07-20 Published:2024-05-30
  • Contact: *E-mail: wupf@swun.edu.cn
  • Supported by:
    National Natural Science Foundation of China(41971064);Key Project of Sichuan Natural Science Foundation(24NSFSC0107);Fundamental Research Funds for the Central Universities(ZYN2024080)

Abstract:

Aim This study aimed to reveal the effects of annual and perennial legume forages on soil nematode communities and to provide technical support for scientifically planting legume forages in the Qinghai-Xizang Plateau.

Methods An annual leguminous Vicia villosa (VV) and a perennial leguminous Medicago sativa (MS) were selected and cultivated in pots in Hongyuan County (northwest Sichuan) from 2020 to 2022. Herbaceous plants from natural grasslands were also cultivated in pots as the control (CK). Taxonomic composition, density, diversity and trophic groups of soil nematode communities were analyzed in late September for each year. Height, coverage, biomass of plants and soil properties were also measured during the study.

Results (1) The differences in taxonomic composition structure of nematode communities were significant among three different treatments and increased across cultivating years. (2) Soil nematode community density in VV was significantly higher than that in MS and CK (P < 0.05). The taxonomic richness and Shannon-Wiener index in MS were significantly higher than those in VV and CK (P < 0.05). The taxonomic richness and Shannon-Wiener index in VV and the density and Shannon-Wiener index in MS declined significantly over years. (3) The density of fungivores and plant parasites nematodes were significantly higher, and the relative density of omnivores-predation nematodes were significantly lower in VV than in MS and CK (P < 0.05). The relative density of plant parasites nematodes was significantly lower in MS than in VV and CK (P < 0.05). The relative density declined significantly for bacterivores and increased significantly for plant parasites over the course of the study in VV. The density of bacterivores and fungivores and the relative density of bacterivores decreased significantly with increasing cultivation years in MS and CK, with the relative density of omnivores-predation responding oppositely. (4) The basal, structural and channel indices of soil nematode communities were significantly higher in the VV than those in the MS. (5) The main environmental factors affecting soil nematode communities were soil pH, available potassium, plant community height, coverage, and aboveground biomass.

Conclusion Our findings indicate that the nematodes are more abundant in annual legume forages and more diverse in perennial legume forage. Therefore, intercropping annual and perennial leguminous forages may benefit promoting the density, diversity, and ecological functions of nematode communities.

Key words: soil animals, legume forages, pot experiment, diversity, alpine grasslands