The spatial influence of aboveground diversity on belowground communities

Abstract

Abstract. Little is known about the effect of diversity surrounding a focal plant species on the belowground community under that species. At least two alternative hypotheses exist. First, studies involving a range of ecosystems and taxonomic groups have shown that changes in diversity in one group of species can promote diversity in other groups. Alternatively, many studies in soil ecology have shown that belowground communities are strongly determined by the dominant aboveground species. To better understand the role of aboveground diversity on belowground communities, we examined soil nematode communities directly under Panicum virgatum (switchgrass) in areas of high and low surrounding plant diversity. We found that soil nematode diversity under switchgrass in areas of high plant diversity (native prairies) was not significantly different from soil nematode diversity under switchgrass in areas of extremely low plant diversity (switchgrass monocultures), indicating that an agricultural monoculture can maintain high levels of belowground diversity on a plant scale. However, reduced plant diversity surrounding focal switchgrass plants resulted in a compositional shift in the belowground community toward fewer herbivorous nematodes. This evidence for the influence of surrounding diversity on belowground communities under a focal plant species is a major shift in perspective from the conventional view on belowground community ecology. Furthermore, the work has broad implications for ecological perspectives on agricultural systems.

Soil Nematode Trophic Groups in Four Different Plantations in Southern China: Implications for Restoration

“…Nematode data were transformed using ln (x + 1) to meet assumptions of normality and homogeneity of variance. Trophic diversity index (TDI) was calculated by TDI = 1/∑pi 2 , where pi is the proportion of individuals of the ith trophic group in the total community [20]. The effects of season, forest type, slope, root zone, and their potential interactions on soil and nematode properties were analyzed using four-way ANOVAs.…”

Perennial grass bioenergy cropping systems: Impacts on soil fauna and implications for soil carbon accrual

“…Restored prairie cropping systems containing a mix of native grasses, legumes, and forbs supported more diverse ant communities than switchgrass (Helms et al, 2020). In contrast, nematode diversity under switchgrass stands was similar regardless of whether switchgrass was grown in monoculture or within a diverse prairie polyculture (Bliss et al, 2010). While nematodes have smaller spatial distributions than meso‐ and macrofauna and thus the potential effects of diversity may not have been fully captured, it is also likely that different size classes, and thus different functional groups, may exhibit variable responses to plant diversity.…”