The distribution of nitrifying bacteria in soil aggregates

Nishio, Mayuko; Furusaka, Chôseki

doi:10.1080/00380768.1970.10432820

Cited by 28 publications

(19 citation statements)

References 6 publications

(1 reference statement)

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“…If so, the bacterial numbers may increase more markedly in "the outer· part" than in "the inner·part" with the rcpetitions of percolation. As reported befon' (2), however, nitrite·oxidizing bacteria in both the parts continued to increasc, maintaining sim· ilar levels at least until the sixth percolation (24 days' percolation) with nitrite. Thus, tht' possihility mentioned above seems unlike\y.…”

Section: Activity Of Nitrite·oxiduing Bacteria Distributed In 2 Partsmentioning

confidence: 64%

“…In the previous paper it was reported that nitrifying bacteria in a soil aggregate are distrib· uted in two parts,·" "the outer·part" which has larger pores and "the inner·part" having small· er ones (2). A possibility exists that inactive nitrite·oxidizing bacteria may be localized in "the inner·part" due to the insufficient supply of the substrate.…”

Section: Activity Of Nitrite·oxiduing Bacteria Distributed In 2 Partsmentioning

confidence: 98%

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Kinetic study of soil percolated wit ii nitrite

Nishio

Furusaka

1971

Soil Science and Plant Nutrition

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Section: Activity Of Nitrite·oxiduing Bacteria Distributed In 2 Partsmentioning

confidence: 64%

Section: Activity Of Nitrite·oxiduing Bacteria Distributed In 2 Partsmentioning

confidence: 98%

Kinetic study of soil percolated wit ii nitrite

Nishio

Furusaka

1971

Soil Science and Plant Nutrition

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“…Nitrifiers have been found to be most abundant and active in 2-to 20-m microaggregates (43), while nitrogen-fixing bacteria were most abundant in the Ͻ2-m clay fraction (44). Under desiccation or environmental stress, nitrifiers persist within the protected interior of macroaggregates (45), but under wet conditions, oxygen diffusion gradients control the rates of nitrification and denitrification across individual macroaggregates, with the onset of denitrification depending on the amount of external oxygen as well as the size of the aggregate particles (46,47). It remains to be tested whether such partitioning of metabolic functions across aggregate structures is a common feature of other soil biogeochemical processes.…”

Section: Impacts Of Aggregate Structure On Soil Communitiesmentioning

confidence: 99%

Soil Aggregate Microbial Communities: Towards Understanding Microbiome Interactions at Biologically Relevant Scales

Wilpiszeski

Aufrecht

Retterer

et al. 2019

Appl Environ Microbiol

284

186

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Soils contain a tangle of minerals, water, nutrients, gases, plant roots, decaying organic matter, and microorganisms which work together to cycle nutrients and support terrestrial plant growth. Most soil microorganisms live in periodically interconnected communities closely associated with soil aggregates, i.e., small (<2 mm), strongly bound clusters of minerals and organic carbon that persist through mechanical disruptions and wetting events. Their spatial structure is important for biogeochemical cycling, and we cannot reliably predict soil biological activities and variability by studying bulk soils alone. To fully understand the biogeochemical processes at work in soils, it is necessary to understand the micrometer-scale interactions that occur between soil particles and their microbial inhabitants. Here, we review the current state of knowledge regarding soil aggregate microbial communities and identify areas of opportunity to study soil ecosystems at a scale relevant to individual cells. We present a framework for understanding aggregate communities as “microbial villages” that are periodically connected through wetting events, allowing for the transfer of genetic material, metabolites, and viruses. We describe both top-down (whole community) and bottom-up (reductionist) strategies for studying these communities. Understanding this requires combining “model system” approaches (e.g., developing mock community artificial aggregates), field observations of natural communities, and broader study of community interactions to include understudied community members, like viruses. Initial studies suggest that aggregate-based approaches are a critical next step for developing a predictive understanding of how geochemical and community interactions govern microbial community structure and nutrient cycling in soil.

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“…Prior to the determination of ammonium·oxidizing bacteria in the soil having a large amount of nitrite, the soil suspension was washed on a 5 p·millipore filter in order to remove nitrite: otherwise nitrite remaining in soil will interfere with the estimate of ammonium·oxidiz-ing bacteria, which were present in the soil at a low population level. The media employed in both procedures have been described previously (2).…”

Section: L'tfaterlals and Methodsmentioning

confidence: 99%

“…Heterotrophic bacteria were counted by preparing broth·agar plates from appropriate serial dilutions prepared for nitrifying bacteria (2).…”

mentioning

confidence: 99%