- The relationship between bacterial diversity and organic carbon mineralization in soft rock and sand compound soil
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Zhen Guo , Juan Li , Lei Ge , Chenxi Yang , Jichang Han
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J. Microbiol. 2020;58(9):750-760. Published online July 24, 2020
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DOI: https://doi.org/10.1007/s12275-020-0130-4
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 Abstract
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The soil organic carbon (SOC) mineralization rate in sandy
soil plays an important role in improving soil quality, and a
research is needed to determine management practices that
optimize the mineralization rate. When sandy soil is improved
by adding soft rock, the specific promotion process of bacterium
to SOC mineralization remain unclear. To investigate
these mechanisms, we selected four treatments with soft
rock to sand volume ratios of 0:1 (CK), 1:5 (C1), 1:2 (C2)
and 1:1 (C3) to study. The mineralization rate of organic carbon
was measured using the lye absorption method. Highthroughput
sequencing and scanning electron microscopy
were used to determine the bacterial community structure
and soil microstructure, respectively. The results showed that
the organic carbon content of the sandy soil increased significantly
(182.22–276.43%) after using the soft rock treatments.
The SOC mineralization rate could be divided into two
stages: a rapid decline during days 1–8 and a slow decline
during days 8–60. With increased incubation time, the intensity
of the cumulative release of organic carbon gradually
weakened. Compared with the CK treatment, the SOC mineralization
accumulation (Ct) and the potential mineralizable
organic carbon content (C0) in the C1, C2, and C3 treatments
increased significantly, by 106.98–225.94% and 112.22–
254.08%, respectively. The cumulative mineralization rate (Cr)
was 18.11% and 21.38% smaller with treatments C2 and C3,
respectively. The SOC mineralization rate constant (k) decreased
significantly after the addition of soft rock, while the
half-turnover period (Th) changed inversely with k. Compared
with the CK treatment, the number of gene copies of
the soil bacteria increased by 15.38–272.53% after adding soft
rock, with the most significant increase in treatment C3. The
bacterial diversity index also increased significantly under
treatment C3. The three dominant bacteria were Proteobacteria,
Actinobacteria, and Chloroflexi. The correlation between
Cr and one of the non-dominant bacteria, Firmicutes,
was large, and the bacteria had a significant positive correlation
with k. At the same time, the abundance of Firmicutes
under treatments C2 and C3 was small. As the proportion
of soft rock increased, the soil particles changed from point
contact to surface contact, and the adhesion on the surface
of the particles gradually increased. Results from this study
show that the retention time of SOC can be increased and
the carbon sequestration effect is better when the ratio of
soft rock to sand is set to 1:2.
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Citations
Citations to this article as recorded by  - Interface of Climate and Environmental Change on Food Systems—A Report from the “Agriculture and Diet: Value Added for Nutrition, Translation, and Adaptation in a Global Ecology” (ADVANTAGE) Project Working Group 3
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