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Dominant plant species influence nematode richness by moderating understory diversity and microbial assemblages.

Authors :
Wang, Xiangtai
Xiao, Sa
Yang, Xiaoli
Liu, Ziyang
Zhou, Xianhui
Du, Guozhen
Zhang, Limin
Guo, Aifeng
Chen, Shuyan
Nielsen, Uffe N.
Source :
Soil Biology & Biochemistry. Oct2019, Vol. 137, pN.PAG-N.PAG. 1p.
Publication Year :
2019

Abstract

Belowground assemblages are tightly linked to the aboveground vegetation, and often differ between plant species and vegetation types due to direct and indirect influences. However, the relative contribution of these direct and indirect influences of plants on belowground organisms differs among taxa and remains poorly understood. We established a plant removal experiment to better understand the effects of dominant plant species on nematode assemblages in an alpine meadow on the Tibetan plateau. We quantified plant community diversity, soil microbial assemblage richness and edaphic properties to explore how a dominant shrub and graminoids affect nematode assemblage structure and community-weighted mean (CWM) biomass using structural equation modelling (SEM). We found contrasting responses of nematode richness and CWM biomass of nematodes to the removal of shrubs and graminoids, including an intriguing interaction between them. The latter indicates that interactions between shrubs and graminoids modify nematode communities rather than their independent effects. Our results further suggest that dominant plants predominantly indirectly influence nematode richness through changes in biotic variables, specifically understory diversity, and bacterial and fungal richness. However, the dominant plants had no direct and limited indirect effects on CWM nematode biomass, which instead increased with soil nitrogen content, and decreased with soil pH, carbon and ammonium content. Our results provide insight into the relative role of direct and indirect influences on belowground assemblages and highlight the importance of dominant plants in maintaining belowground diversity. By contrast, edaphic properties appear more important to belowground biomass, likely reflecting longer term influences of the plant community on resource availability and quality. Vegetation changes in grassland, such as reduced dominance of shrubs and graminoids, might therefore reduce soil biodiversity relatively rapidly but contribute to longer term impacts through changes in biogeochemical cycles. • The removal of shrubs and graminoids influences soil nematode communities. • Nematode richness is affected by shrubs and graminoids via forb diversity. • Nematode richness is affected by shrubs and graminoids via microbial richness. • Nematode biomass is related to soil properties, which are not related to the removal. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00380717
Volume :
137
Database :
Academic Search Index
Journal :
Soil Biology & Biochemistry
Publication Type :
Academic Journal
Accession number :
138499018
Full Text :
https://doi.org/10.1016/j.soilbio.2019.107566