Soil Microbiomes
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A Practical programmes translate evidence about soil microbiomes into action. The discussion of soil microbiomes notes that farmers adjust crop rotations, organic inputs and disturbance while monitoring physical and biological indicators. Their stated focus is soil health. Teams working on soil microbiomes compare later outcomes with conditions before implementation and record unintended effects. This evaluation of soil microbiomes determines whether the original explanation involving functional redundancy remains useful outside the research setting. B For the present account of soil microbiomes, soil contains diverse bacteria, fungi and other organisms that transform nutrients and interact with plant roots. In soil ecology, the term microbiome refers to the community of microorganisms living in a particular environment. The definition gives researchers a common starting point for discussing soil microbiomes, but it does not identify a cause by itself. Two observations of soil microbiomes can share the label microbiome while differing in scale, timing or origin. C Knowledge of soil microbiomes accumulated unevenly across farms, forests and restored land. A striking report could establish that a pattern existed, yet it could not show whether functional redundancy operated elsewhere. Researchers examining soil microbiomes therefore moved toward shared definitions and planned comparisons based on DNA sequencing rather than discarding the earlier record. D Researchers rely chiefly on DNA sequencing to investigate soil microbiomes. Research on soil microbiomes has found that sequencing is paired with enzyme tests and soil chemistry because genetic presence does not prove biological activity. They decide their comparison, exclusions and outcome measures for soil microbiomes in advance. A result about soil microbiomes is treated as stronger when it survives more than one source of evidence, not simply when one instrument measuring soil microbiomes reports many decimal places. E The evidence about soil microbiomes is informative but conditional. One point relevant to soil microbiomes is that microbial communities respond to moisture, plants and management, but similar functions may be performed by different organisms. Researchers test functional redundancy as an explanation. Evidence reviewed for soil microbiomes shows that several microbial groups can sometimes carry out the same ecological process. Confidence in functional redundancy rises when independent measures of soil microbiomes agree and rival explanations fail, rather than when a single comparison happens to be statistically precise. F Interpretation of soil microbiomes must stop short of a universal claim. For the present account of soil microbiomes, a larger count of microbial types is not automatically better, and laboratory extraction can favour some organisms over others. Future work on soil microbiomes is organised around activity-based measures. For future research on soil microbiomes, activity-based measures will complement DNA lists and show which organisms are contributing under field conditions. This use of activity-based measures targets a specific uncertainty about soil microbiomes rather than merely increasing the volume of data.