Variations of soil bacterial community and denitrifier abundance with depth under different land-use types

Han, Wanxue; Wang, Fenghua; Zhang, Linqi; Zhao, Huicheng; Zheng, Yuchong; Sun, Run‐Cang; Liang, Meng

doi:10.1007/s11368-023-03428-8

Cited by 3 publications

(1 citation statement)

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“…In line with this observation, Bastida et al (2021) found that increased SOC content signi cantly enhanced soil microbial biomass, in uencing the diversity of bacteria and fungi communities. Moreover, studies have shown that substrate availability plays a crucial role in regulating the diversity of soil microorganisms under different land use systems Han et al, 2023). Thus, variation in substrate accessibility due to differences in land use types and across depth or horizon can affect microbial resources (e.g., carbon, nitrogen, phosphorus, sulfur) (Han et al, 2023), consequently driving changes in community patterns (i.e., distribution) and composition (Labouyrie et al, 2023).…”

Section: Chemical and Physical Bulk Soil Characteristicsmentioning

confidence: 99%

Storage and persistence of organic carbon in the upper three meters of soil under arable and native prairie land use

Anuo,

Li,

Moreland

et al. 2024

Preprint

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Aims - Land use change from native grasslands to arable lands globally impacts soil ecosystem functions, including the storage of soil organic carbon (SOC). Understanding the factors affecting SOC changes in topsoil and subsoil due to land use is crucial for effective mitigation strategies. We determined SOC storage and persistence as affected by land use change from native prairies to arable lands.Methods - We examined SOC stocks, soil δ13C and ∆14C signatures, microbial community (bacteria and fungi), and soil mineral characteristics under native prairies and long-term arable lands (i.e., > 40 years) down to 3 m in the U.S. Midwest.Results - Native prairie soils had higher SOC stocks in the A horizon and 0–50 cm depth increment than arable soils. For both land use types, the δ13C and ∆14C values significantly decreased with depth, with the latter pointing towards highly stabilized SOC, especially in the B- and C-horizons. Analysis of microbial communities indicated that the diversity of bacteria and fungi decreased with soil depth. The content of oxalate soluble Al appeared to be the single most important predictor of SOC across horizons and land use types.Conclusion - Our data suggest that most SOC gains and losses and transformation and translocation processes seem to be restricted to the uppermost 50 cm. Increasing SOC retention in A and B horizons within the 0–50 cm depth would enhance organic material serving as substrate and nutrients for microbes and plants (A horizon) and facilitate long-term SOC storage in subsoil (B horizon).

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