Soil nematode communities in temperate rice-growing systems

Korobushkin, Danııl I.; Butenko, Konstantin O.; Gongalsky, Konstantin B.; Saifutdinov, Ruslan A.; Zaitsev, Andrey S.

doi:10.1016/j.ejsobi.2019.103099

Cited by 9 publications

(6 citation statements)

References 25 publications

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“…Soil invertebrate species composition, taxonomic richness and overall abundance were significantly altered by longterm nutrient management for all taxa. This confirms our second hypothesis and proves that the management regime strongly influences the structure of belowground communities (see also Degtyarev et al, 2019;Korobushkin et al, 2019;Saifutdinov et al, 2020). Given the duration of the meso-and microfauna life cycles (Hopkin, 1997;Khan and Kim, 2007) and the comparatively small-scale fertilizer application (see section "Materials and Methods"), immediate community changes due to demographic responses or to lethal and repulsive effects are highly unlikely.…”

Section: Discussionsupporting

confidence: 77%

Fertilization Rapidly Alters the Feeding Activity of Grassland Soil Mesofauna Independent of Management History

et al. 2022

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Nitrogen fertilization of permanent grasslands affects soil fauna communities by modifying their taxonomic composition, population dynamics and feeding activity. However, it is not well understood if the edaphic fauna adapts to these external inputs so that the immediate response to fertilizer application depends on the long-term nutrient management strategy. We performed a field experiment in permanent grasslands under agricultural management in three regions across Germany. We used experimental fertilization with an organic plant-sourced fertilizer along a long-term nutrient management gradient to study the immediate and long-term effects of fertilization and their interdependence on the taxonomic composition and feeding activity of the soil mesofauna (Nematoda, Oribatida, and Collembola). Sampling season, soil properties, vegetation structure, and geographic location were considered as additional predictor variables to reflect heterogeneity in environmental conditions. The taxonomic composition, richness and total abundance of soil mesofauna communities were significantly affected by long-term nutrient management, but not by experimental fertilization. However, N pulses rapidly (within days) reduced the feeding activity estimated with bait-lamina strips independent of long-term nutrient management strategies. Experimental addition of organic plant-sourced fertilizer may have led to a rapid build-up of microbial biomass, providing alternative food sources for the soil mesofauna and causing a shift away from the bait-lamina substrate. Our study indicates that community changes associated with the long-term nutrient management regime in permanent grasslands do not alter the strong functional response of the soil mesofauna to N pulses. There is an urgent need to develop nutrient management strategies for permanent grasslands that take into account both the conservation of the edaphic faunal community and changes of ecosystem functions caused by rapid responses of the soil mesofauna to fertilizer inputs.

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Section: Discussionsupporting

confidence: 77%

Fertilization Rapidly Alters the Feeding Activity of Grassland Soil Mesofauna Independent of Management History

et al. 2022

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“…Rice cultivation continuously alters the diversity and abundances with different feeding habits, and thus alters the overall complexity and architecture of the detritus food web, which coincides with the findings of Korobushkin [ 79 ]. The above-mentioned community and diversity indices of soil nematodes are helpful in investigating soil stability and efficiency, explaining life strategies to exist as colonizer-persisters, and feeding pathways.…”

Section: Discussionsupporting

confidence: 74%

Year-Long Assessment of Soil Nematode Diversity and Root Inhibition-Indicator Nematode Genera in Rice Fields

Nisa

Hroobi

et al. 2022

Biology

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Soil nematodes contribute to nutrient cycling. This year-long study aimed to investigate the changes in the diversity of soil nematodes during the spring, summer, and winter seasons in rice fields at 24 sites and to determine the indicator nematode genera that inhibit the roots of rice plants. A total of 216 soil samples were collected during three seasons, and the collection of 72 root samples was carried out during rice cropping. Forty-four soil nematode genera were identified. They exhibited significant changers in their abundance, which were dependent on the seasons and on soil characteristics. In particular, the abundance of plant-parasitic nematodes (PPNs) and free-living soil nematodes was 49% and 15% higher during the summer than during the spring and winter seasons, respectively. Soil characteristics, such as soil nitrogen (N) contents, carbon (C) contents, and soil moisture were significantly higher during the summer than in the spring and winter seasons, but soil pH was significantly lower during the summer than in the spring and winter seasons. Moreover, Hirschmanniella, Meloidogyne, and Heterodera emerged as good indicators for rice root inhibition, corroborating the frequency, density, and prominence value of PPNs of the sampled soil and rice roots. This study also indicated that free-living nematode genera, such as Rhabdolaimus, Diplogaster, and Rhabditis, might function as ecological indicators for soil health.

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“…In this study, Panagrellus and Rhabditis were the only bacterivorous enrichment opportunists. Rhabditis has been previously reported in paddy areas [ 50 ] but Korobushkin et al [ 25 ] did not observe the genus in irrigated rice fields. The abundance of enrichment opportunists in the family Rhabditidae may be attributed to increased breakdown of organic matter by bacteria and the availability of labile food sources [ 27 ].…”

Section: Introductionmentioning

confidence: 96%

“…Disturbance in rice fields alters the food web structure by reducing nematode trophic levels, number of predatory nematodes, enrichment and structure indices [ 25 ]. Wang et al [ 26 ] reported alterations in nematode trophic groups and the Plant-Parasitic Index (PPI) due to elevated carbon dioxide in rice paddy fields.…”

Section: Introductionmentioning

confidence: 99%

“…Control of Helicotylenchus in Mwea is imperative since it significantly affects rice grain yield [ 55 ] and concomitant infection of paddy rice by Criconemella onoensis and H. dihystera causes 63–72% yield losses [ 56 ]. Only one predatory genus, Mylonchulus was present in both regions probably due to the negative effects of flooding on predaceous nematodes [ 25 ]. The extraction method used in this study favored the extraction of majority of genera from the nematode community but is not optimal for extraction of some genera that have low motility.…”

Section: Introductionmentioning

confidence: 99%

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