Bacterivorous nematodes and organic-matter decomposition

Freckman, Diana W.

doi:10.1016/0167-8809(88)90066-7

Cited by 274 publications

(128 citation statements)

References 63 publications

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“…Soil nematodes generally stimulate N mineralization directly by the excretion of N and indirectly by grazing on soil microorganisms, thereby stimulating microbial turnover and production (Van Der Heijden, Bardgett & Van Straalen 2008). Approximately 30% of total net N mineralization is due to the direct effects of soil fauna (Freckman 1988;Ferris et al 1998;Djigal et al 2004).…”

Section: E F F E C T S O F S O I L a C I D I F I C A T I O N O N N C mentioning

confidence: 99%

“…Thirdly, soil acidification also directly changes soil microbial (Kuperman & Edwards 1997;Rousk et al 2010a) and nematode communities (Williams & Dusenbery 1990;Raty & Huhta 2003), which can in turn alter plant diversity, community structure and productivity (Van Der Heijden, Bardgett & Van Straalen 2008;Bardgett & Wardle 2010). Finally, soil acidification is known to indirectly modify key ecosystem processes such as N mineralization and N cycling by altering the soil microbes and nematodes (Freckman 1988;Ferris et al 1998;Djigal et al 2004). However, the relative contributions of these mechanisms or pathways to soil acidification-induced changes in plant diversity and productivity have not been studied in detail with field experiments (Bardgett & Wardle 2010).…”

Section: Introductionmentioning

confidence: 99%

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Evidence that acidification‐induced declines in plant diversity and productivity are mediated by changes in below‐ground communities and soil properties in a semi‐arid steppe

et al. 2013

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Summary1. Anthropogenic acid deposition-induced soil acidification is one of the major threats to biodiversity, ecosystem functioning and services. Few studies, however, have explored in detail how above-ground changes in plant species richness and productivity resulting from soil acidification are mediated by effects on below-ground biota and soil properties. 2. To increase our understanding of this linkage, we collected data on below-and above-ground communities and soil properties in a 3-year field experiment with seven levels of acid addition rate to build-up broad intensities of soil acidification in the semi-arid Inner Mongolian grassland. -N) could be explained by mediating changes in the H + and Al 3+ ions, microbial community (i.e. community structure, bacteria and fungi/bacteria as indicated by phospholipid fatty acids analysis) and the nematode community (i.e. total abundance, taxa richness and maturity index). 5. Declines in plant species richness and productivity were greater at high intensities of soil acidification in the second sampling year than in the first sampling year. The changes in plant community observed were mostly explained by soil nutrient pathways (e.g. N availability or base mineral cations), which were in turn regulated by the soil microbial or nematode communities as well as by the direct effects of the increase in H + or Al 3+ ions.6. Synthesis. Our results suggest that the below-ground microbial and nematode communities are more sensitive to soil acidification than the plant communities are, and further that soil acidification-induced changes in plants are mediated by changes in below-ground communities and soil nutrients. These findings improve our understanding of the links between below-and above-ground communities in the Inner Mongolia grassland, especially in the context of anthropogenic acid enrichment.

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Section: E F F E C T S O F S O I L a C I D I F I C A T I O N O N N C mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evidence that acidification‐induced declines in plant diversity and productivity are mediated by changes in below‐ground communities and soil properties in a semi‐arid steppe

et al. 2013

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“…Free-living soil nematodes are abundant multicellular animals that participate in fundamental ecological processes in the soil, such as decomposition and nutrient cycling [12][13][14]. They are sensitive to different kinds of ecosystem disturbances and soil conditions [1,12,[15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…They are sensitive to different kinds of ecosystem disturbances and soil conditions [1,12,[15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

The effects of prescribed fire on soil nematodes in an arid juniper savanna

Whitford¹,

Pen-Mouratov²,

Steinberger

2014

OJE

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Prescribed fire produced a landscape with two types of severely burned patches: charred shrub patches and charred patches with tree trunks at the center. Soil nematodes were more abundant in burned and unburned juniper (Juniperus monosperma) tree patches than in yucca-shrub patches. There were no differences in nematode abundance between burned and unburned patches during the late spring and summer samples. Nematode abundance was significantly (p < 0.05) higher in unburned patches than in burned patches in the early spring samples, reflecting large differences in soil moisture between unburned and burned patches. There were no differences in soil nematode abundance between burned and unburned patches at oneyear post-burn and three-year post-burn sites. When all samples were pooled, taxonomic diversity, ecological indices, and abundance of trophic groups (bacteria-feeders, fungi-feeders, and omnivore-predators) were higher in unburned than burned patches. These results suggest that the long-term (up to three years post-burn) effects of fire on soil nematodes are indirect, i.e., by loss of tree canopies, litter accumulation, and shrub foliage, which affects soil temperatures and water redistribution.

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“…Soil microbial communities are strongly influenced by soil-dwelling invertebrates such as nematodes and microarthropods (Scheu et al 2005;Fu et al 2005). Soil nematodes are important invertebrates in soil ecosystem with profound effects on microbial community and organic matter decomposition (Anderson et al 1981;Freckman 1988;Yeates and Bongers 1999;Neher 2001;Fu et al 2005). Many studies suggest that nematodes are useful bioindicators in soil and aquatic ecosystems, especially for assessment of ecosystem health (Bongers and Ferris 1999;Ferris and Bongers 2006;Shao et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Responses of soil microbial and nematode communities to aluminum toxicity in vegetated oil-shale-waste lands

et al. 2012

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Both soil nematodes and microorganisms have been shown to be sensitive bioindicators of soil recovery in metal-contaminated habitats; however, the underlying processes are poorly understood. We investigated the relationship among soil microbial community composition, nematode community structure and soil aluminum (Al) content in different vegetated aluminum-rich ecosystems. Our results demonstrated that there were greater soil bacterial, fungal and arbuscular mycorrhizal fungal biomass in Syzygium cumini plantation, greater abundance of soil nematodes in Acacia auriculiformis plantation, and greater abundance of soil predatory and herbivorous nematodes in Schima wallichii plantation. The concentration of watersoluble Al was normally greater in vegetated than nonvegetated soil. The residual Al and total Al concentrations showed a significant decrease after planting S. cumini plantation onto the shale dump. Acid extractable, reducible and oxidisable Al concentrations were greater in S. wallichii plantation. Stepwise linear regression analysis suggests the concentrations of water-soluble Al and total Al content explain the most variance associated with nematode assembly; whereas, the abundance of early-successional nematode taxa was explained mostly by soil moisture, soil organic C and total N rather than the concentrations of different forms of Al. In contrast, no significant main effects of either Al or soil physico-chemical characteristics on soil microbial biomass were observed. Our study suggests that vegetation was the primary driver on soil nematodes and microorganisms and it also could regulate the sensitivity of bio-indicator role mainly through the alteration of soil Al and physico-chemical characteristics, and S. cumini is effective for amending the Al contaminated soils.

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Bacterivorous nematodes and organic-matter decomposition

Cited by 274 publications

References 63 publications

Evidence that acidification‐induced declines in plant diversity and productivity are mediated by changes in below‐ground communities and soil properties in a semi‐arid steppe

Evidence that acidification‐induced declines in plant diversity and productivity are mediated by changes in below‐ground communities and soil properties in a semi‐arid steppe

The effects of prescribed fire on soil nematodes in an arid juniper savanna

Responses of soil microbial and nematode communities to aluminum toxicity in vegetated oil-shale-waste lands

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