NDLI: In Situ Spatial Patterns of Soil Bacterial Populations, Mapped at Multiple Scales, in an Arable Soil

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Microbial Ecology : Volume 44, Issue 3, October 2002

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In Situ Spatial Patterns of Soil Bacterial Populations, Mapped at Multiple Scales, in an Arable Soil

Content Provider	Springer Nature Link
Author	Nunan, N. Wu, K. Young, I.M. Crawford, J.W. Ritz, K.
Abstract	Very little is known about the spatial organization of soil microbes across scales that are relevant both to microbial function and to field-based processes. The spatial distributions of microbes and microbially mediated activity have a high intrinsic variability. This can present problems when trying to quantify the effects of disturbance, management practices, or climate change on soil microbial systems and attendant function. A spatial sampling regime was implemented in an arable field. Cores of undisturbed soil were sampled from a 3 × 3 × 0.9 m volume of soil (topsoil and subsoil) and a biological thin section, in which the in situ distribution of bacteria could be quantified, prepared from each core. Geostatistical analysis was used to quantify the nature of spatial structure from micrometers to meters and spatial point pattern analysis to test for deviations from complete spatial randomness of mapped bacteria. Spatial structure in the topsoil was only found at the microscale (micrometers), whereas evidence for nested scales of spatial structure was found in the subsoil (at the microscale, and at the centimeter to meter scale). Geostatistical ranges of spatial structure at the micro scale were greater in the topsoil and tended to decrease with depth in the subsoil. Evidence for spatial aggregation in bacteria was stronger in the topsoil and also decreased with depth in the subsoil, though extremely high degrees of aggregation were found at very short distances in the deep subsoil. The data suggest that factors that regulate the distribution of bacteria in the subsoil operate at two scales, in contrast to one scale in the topsoil, and that bacterial patches are larger and more prevalent in the topsoil.
Starting Page	296
Ending Page	305
Page Count	10
File Format	PDF
ISSN	00953628
Journal	Microbial Ecology
Volume Number	44
Issue Number	4
e-ISSN	1432184X
Language	English
Publisher	Springer-Verlag
Publisher Date	2002-10-14
Publisher Place	New York, Heidelberg
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article
Subject	Soil Science Ecology Ecology, Evolution, Behavior and Systematics

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