Grazing induces direct and indirect shrub effects on soil nematode communities

Wang, Xiangtai; Nielsen, Uffe N.; Yang, Xue; Zhang, Limin; Zhou, Xianhui; Du, Guozhen; Li, Guixin; Chen, Shuyan; Xiao, Sa

doi:10.1016/j.soilbio.2018.03.007

Cited by 52 publications

(40 citation statements)

References 48 publications

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“…In contrast, G2 was characterized by the bacterivores Monhystera and Wilsonema. Previous studies also showed that grazing stimulated bacterivores (Sørensen et al 2009;Wang et al 2018). This is likely due to manure amendment from animals under moderate grazing increasing the growth and activity of bacteria (Xun et al 2018), as manure is bacterivorous food.…”

Section: Effect Of Grazing Intensity On Carbon Utilization Of Soil Nematodesmentioning

confidence: 87%

“…2). Wang et al (2018) reported an increasing trend of structure and enrichment footprints in grazed meadows with shrub vegetation. This may be attributed to light grazing increasing root exudation, which then promotes the activity of soil biota.…”

Section: Effect Of Grazing Intensity On Carbon Utilization Of Soil Nematodesmentioning

confidence: 99%

“…Previous studies have reported that grazing can induce effects on belowground ecosystems by changes in vegetation composition or soil properties (Andriuzzi and Wall 2017). For example, grazing can regulate the linkages between aboveground and belowground parts via direct and indirect shrub effects on nematode abundance (Wang et al 2018), and can increase the abundance of soil nematodes such as omnivores and predators in a humid grassland (Wang et al 2006) and fungivores in an arid steppe (Freckman and Huang 1998). The effects of grazing intensity on community structure of soil nematodes are inconsistent.…”

Section: Introductionmentioning

confidence: 99%

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Effects of grazing intensity on soil nematode community structure and function in different soil layers in a meadow steppe

et al. 2021

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Aims Grazing is a key driver of plant communities and soil functions in grassland ecosystems. Soil nematodes play a vital role in soil ecological functions. however, few studies have explored how grazing shapes soil nematode community in different soil layers.Methods we investigated the composition, abundance, diversity, metabolic footprint, and food web metrics of soil nematodes over a gradient of grazing in the 0-10 cm and 10-20 cm soil layers in a meadow steppe. The relationships between nematode community structure and biotic and abiotic factors were analyzed by principal component analysis (PCA) and structural equation model (SEM) analysis.Results Light grazing tended to increase the abundance of soil nematodes. Intensive grazing decreased the biomass carbon and metabolic footprints of plant parasites, fungivores, and total soil nematodes in 0-10 cm soils. There was no difference in the biomass carbon and metabolic footprints of soil nematodes among different grazing intensities in the 10-20 cm soil layer. Soil moisture, aboveground biomass, belowground biomass and Shannon diversity of grass contributed more to changes in soil nematode composition in both soil layers. In the 0-10 cm soil layer, grazing directly and indirectly affected soil nematode diversity via soil moisture and aboveground biomass, while grazing directly affected soil nematode diversity in 10-20 cm soil layer.Conclusions Our results indicate that soil depth can weaken the effect of grazing intensities on soil nematode fauna. Grazing affected the soil nematode community structure via different paths in different soil layers. HighlightsThere was less effect of grazing intensity on soil nematode communities at deeper depths Grazing affected the soil nematode community via different paths at different soil depths Intensive grazing decreased the carbon utilization of soil nematodes

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Section: Effect Of Grazing Intensity On Carbon Utilization Of Soil Nematodesmentioning

confidence: 87%

Section: Effect Of Grazing Intensity On Carbon Utilization Of Soil Nematodesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of grazing intensity on soil nematode community structure and function in different soil layers in a meadow steppe

et al. 2021

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“…There is an increasing interest in the linkages between plants and belowground communities given the observed effects on ecosystem functioning (Abgrall et al 2018;Shao et al 2018; Wang et al 2018). The communities of soil nematode are highly diverse both spatially and temporally (Pen-Mouratov et al 2004) and has attracted much attention as bio-indicators (Neher 2001).…”

Section: Introductionmentioning

confidence: 99%

Direct and Indirect Effects on Soil Nematode Communities Differ Between Facilitative and Allelopathic Plants

Song

Liu

Chen

et al. 2021

Preprint

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Plants are expected to affect soil nematode communities. However, comparative studies on the direct and indirect ways dominant plants influence soil nematode communities are rare. In this study, we compared the effects of a dominant allelopathic plant, Ligularia virgaurea, and a dominant facilitative plant, Dasiphora fruticosa, on soil nematode richness and community composition in an alpine meadow of the Tibetan plateau. Our result indicated that 1) D. fruticosa significantly increased nematode richness whereas L. virgaurea had no significant effect; 2) D. fruticosa had no significant impact on bacterial and fungal richness, but L. virgaurea increased fungal richness; 3) D. fruticosa had strong positive direct, and weak positive indirect, effects on nematode richness, mainly mediated by a marginal decrease in fungal richness. By contrast, L. virgaurea had no significant direct effect on soil nematode richness but had strong indirect effects, mainly mediated by changes in soil pH and soil organic carbon content; 4) L. virgaurea influenced soil nematode community composition predominantly through direct effects but also indirectly through soil organic carbon. By contrast, D. fruticosa affected nematode communities through changes in understory plant communities, soil physiochemical, and microbial communities. Both facilitative and allelopathic plants thus influence soil nematode richness and community composition but seemingly in different ways. These highlight the importance of plants in determining soil community diversity and provide new insight to disentangle the complex above- and belowground linkages.

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“…Soil microorganisms and nematodes are the most abundant microfauna in terrestrial ecosystems, and play important roles in ecosystem functions and services, such as plant productivity, nutrient cycling, and organic decomposition (Delgado-Baquerizo et al 2020). Grassland degradation can affect soil biotic communities via changes in vegetation composition and soil characteristics (Chen et al 2013;Wang et al 2018). Chen et al (2013) found that the influence of overgrazing on soil microbes led to a negative effect on soil nematode communities in a field experiment in Inner Mongolia.…”

Section: Introductionmentioning

confidence: 99%

Effect of grassland degradation on soil quality and soil biotic community in a semi-arid temperate steppe

Han

et al. 2020

Ecol Process

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Grasslands provide a number of ecosystem services for human society. Degradation of grasslands results in the loss of biodiversity and leads to the deterioration of ecosystem functions. In order to accurately assess the influence of grassland degradation on belowground ecosystems, we conducted experiments on a temperate steppe with different levels of degradation and investigated the influence of degradation on soil quality and soil biotic communities. Our results showed that grassland degradation significantly decreased soil quality, with lower values of soil quality index (SQI) observed in the degraded grassland than the meadow steppe and the grassland from the forest-steppe ecotone. Changes in the SQI along the grassland degradation gradient were positively correlated with soil carbon stock and the aboveground biomass, and negatively correlated with the root shoot ratio. Nematode trophic diversity and the ratio of fungal to bacterial PLFA were lower in the degraded grassland than the grassland from the forest-steppe ecotone. The dissimilarities in soil microbial and nematode community composition increased with the changes in soil quality index. Our results indicate that soil quality index based on the minimum data sets could effectively assess the influence of grassland degradation on soil biodiversity and ecosystem function. In order to effectively restore degraded grasslands, the key contributors to the soil quality, such as soil carbon, should be taken on priority basis for revitalizing the soil biodiversity and ecosystem function.

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Grazing induces direct and indirect shrub effects on soil nematode communities

Cited by 52 publications

References 48 publications

Effects of grazing intensity on soil nematode community structure and function in different soil layers in a meadow steppe

Effects of grazing intensity on soil nematode community structure and function in different soil layers in a meadow steppe

Direct and Indirect Effects on Soil Nematode Communities Differ Between Facilitative and Allelopathic Plants

Effect of grassland degradation on soil quality and soil biotic community in a semi-arid temperate steppe

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