scholarly journals Decreased precipitation frequency altered abundance, but not community structure, of soil nematodes in degraded grasslands

2021 ◽  
Vol 131 ◽  
pp. 108184
Author(s):  
Junda Chen ◽  
Yuan Yao ◽  
Gui Wang ◽  
Xiaoyue Zhong ◽  
Tianxue Yang ◽  
...  
Keyword(s):  
Community Structure ◽  
Soil Nematodes ◽  
Precipitation Frequency

scholarly journals Climate change and physical disturbance cause similar community shifts in biological soil crusts

2015 ◽  
Vol 112 (39) ◽  
pp. 12116-12121 ◽  
Author(s):  
Scott Ferrenberg ◽  
Sasha C. Reed ◽  
Jayne Belnap
Keyword(s):  
Climate Change ◽  
Community Structure ◽  
Summer Rainfall ◽  
Community Change ◽  
Biological Soil Crusts ◽  
Physical Disturbance ◽  
Precipitation Frequency ◽  
Soil Crusts ◽  
Altered Precipitation

Biological soil crusts (biocrusts)—communities of mosses, lichens, cyanobacteria, and heterotrophs living at the soil surface—are fundamental components of drylands worldwide, and destruction of biocrusts dramatically alters biogeochemical processes, hydrology, surface energy balance, and vegetation cover. Although there has been long-standing concern over impacts of physical disturbances on biocrusts (e.g., trampling by livestock, damage from vehicles), there is increasing concern over the potential for climate change to alter biocrust community structure. Using long-term data from the Colorado Plateau, we examined the effects of 10 y of experimental warming and altered precipitation (in full-factorial design) on biocrust communities and compared the effects of altered climate with those of long-term physical disturbance (>10 y of replicated human trampling). Surprisingly, altered climate and physical disturbance treatments had similar effects on biocrust community structure. Warming, altered precipitation frequency [an increase of small (1.2 mm) summer rainfall events], and physical disturbance from trampling all promoted early successional community states marked by dramatic declines in moss cover and increases in cyanobacteria cover, with more variable effects on lichens. Although the pace of community change varied significantly among treatments, our results suggest that multiple aspects of climate change will affect biocrusts to the same degree as physical disturbance. This is particularly disconcerting in the context of warming, as temperatures for drylands are projected to increase beyond those imposed as treatments in our study.

scholarly journals Community Structure of Soil Nematodes Associated with Solanum Tuberosum

2012 ◽  
Vol 5 (1) ◽  
Author(s):  
Martin M. Matute ◽  
Yvonne A. Manning ◽  
Mariam I. Kaleem
Keyword(s):  
Solanum Tuberosum ◽  
Community Structure ◽  
Soil Nematodes

scholarly journals Distribution of nematodes in wetland soils with difference distance from the Bohai sea 359–366

2008 ◽  
Vol 54 (No. 8) ◽  
pp. 359-366 ◽  
Author(s):  
H.Y. Wu ◽  
X.X. Li ◽  
L.B. Shi ◽  
Z.H. Wang ◽  
F.Y. Ma
Keyword(s):  
Community Structure ◽  
Bohai Sea ◽  
Coastal Wetland ◽  
Yellow River ◽  
Nematode Community ◽  
Soil Nematode ◽  
Soil Nematodes ◽  
Nematode Communities ◽  
Plant Parasitism ◽  
Soil Nematode Communities

In order to elucidate the distribution of soil nematodes in coastal wetlands and the effect of different distance from the sea line on soil nematode communities, we investigated the community structure of soil nematodes in one wetland perpendicularly oriented from Bohai sea coastline. In June 2006, soil samples were collected from the Yellow River Delta wetlands, in Dongying city of Shandong Province, China. Soil nematode communities were analyzed at the depths of 0–10 and 10–20 cm. The results showed that plant parasite nematodes were the most abundant trophic groups in both depths and at four sites. The average relative abundance was 91.33% of the nematode community. Several ecological indices which reflected soil nematode community structure, diversity, maturity and plant parasitism were compared in these four sites. The results indicated that the maturity index (MI) and plant parasitism index (PPI) were more sensitive than the other indices for assessing the response of soil nematode communities to soil of coastal wetland.

Sulfur deposition changed the community structure of soil nematodes by affecting omnivores-predators

2021 ◽  
Vol 771 ◽  
pp. 144912
Author(s):  
Ailin Zhang ◽  
Olusanya Abiodun Olatunji ◽  
Akash Tariq ◽  
Tianpeng Li ◽  
Ruzhen Wang ◽  
...  
Keyword(s):  
Community Structure ◽  
Soil Nematodes ◽  
Sulfur Deposition

scholarly journals Effects of Mowing Frequency on Soil Nematode Diversity and Community Structure in a Chinese Meadow Steppe

2021 ◽  
Vol 13 (10) ◽  
pp. 5555
Author(s):  
Jinling Zhao ◽  
Jiale Chen ◽  
Honghui Wu ◽  
Linghao Li ◽  
Fengjuan Pan
Keyword(s):  
Community Structure ◽  
Critical Factor ◽  
Terrestrial Ecosystems ◽  
Structure Stability ◽  
Soil Nematode ◽  
Soil Nematodes ◽  
Grassland Ecosystems ◽  
Management Measures ◽  
Nematode Diversity ◽  
The Stability

Soil nematodes are one of the most important components in terrestrial ecosystems and the critical factor driving the belowground process. The grasslands of Northeast China have been subject to mowing for ages, which theoretically should have had substantial effects on the processes associated with soil nematodes. However, relevant studies have barely been conducted to date. This study examined variations in soil nematode abundance, biomass, diversity, and community structure, with respect to varying mowing frequencies. The results showed that a higher mowing frequency significantly reduced the abundance of soil nematodes, biomass, diversity, and community structure stability in the ecosystem, while intermediate mowing frequency enhanced these parameters to different extents. Our findings indicate that the changing patterns of the nematode indices with mowing frequency conform to the intermediate disturbance theory. This study provides a theoretical basis for formulating grassland-related management measures and maintaining the stability of grassland ecosystems.

scholarly journals Effect of transgenic insect-resistant maize to the community structure of soil nematodes in two field trials

2015 ◽  
Vol 52 (1) ◽  
pp. 41-49
Author(s):  
A. Čerevková ◽  
L Cagáň
Keyword(s):  
Community Structure ◽  
Food Web ◽  
Field Trials ◽  
Soil Nematode ◽  
Soil Nematodes ◽  
Soil Food Web ◽  
Bt Maize ◽  
Maize Hybrid ◽  
Nematode Communities ◽  
Soil Nematode Communities

Summary The aim of this study was to determine the effects of Bt maize hybrid cultivation on soil nematode communities in two field trials, as well as to analyse other factors (fertilisation and moisture) responsible for the community structure of soil nematodes. Nematode communities were studied in maize plots at the locality of Borovce in western Slovakia. During 2012 and 2013, hybrids DK440 and DKC3871 (conventional) or DKC4442YG and DKC3872YG (Bt maize, event MON810) were sown in 10 repetitions each. Nematodes were extracted from soil samples collected at the maize flowering (July 11, 2012 and July 30, 2013). Altogether, 39 nematode species belonged to 35 genera were identified in two maize variants. The dominant taxa in both variants were Acrobeloides nanus, Ce-phalobus persegnis, Aphelenchoides composticola, Aphelenchus avenae, Eudorylaimus carteri and Filenchus vulgaris. Calculation of the maturity index, plant parasitic index, enrichment index and structure index did not confirm any clear influence of year or hybrid type on soil nematode communities. The proportional representation of cp-1, cp-2 and cp-3-5 groups of nematode fauna indicated conditions of low stability and high stress. Faunal profiles representing the structure and enrichment conditions of the soil food web showed an environment with a high C:N ratio and high levels of fungal feeders. Based on the calculation of the metabolic footprint of nematodes in the soil food web, a difference between the isoline maize variant and Bt maize variant in 2012 was found, but this difference was not readily apparent in 2013. The occurrence of nematodes, their abundance, proportion of feeding types and selected ecological indices did not depend on the type of maize hybrid (Bt or non-Bt). Thus, the cultivation of genetically modified maize did not directly influence nematode populations. The application of fertiliser at certain periods does not influence the nematode community. The observed significant higher abundance of nematodes was correlated with soil moisture.

scholarly journals Effects of Grazing Intensity on Soil Nematode Community Structure and Function in Different Soil Layers in a Meadow Steppe

2021 ◽  
Author(s):  
Fengjuan Pan ◽  
Ruirui Yan ◽  
Jinling Zhao ◽  
Linghao Li ◽  
Yanfeng Hu ◽  
...  
Keyword(s):  
Community Structure ◽  
Soil Layer ◽  
Nematode Community ◽  
Soil Nematode ◽  
Soil Nematodes ◽  
Meadow Steppe ◽  
Soil Layers ◽  
Soil Nematode Community ◽  
Nematode Diversity ◽  
Grazing Intensities

Abstract 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.

Sign in / Sign up

Export Citation Format

Share Document