Rhizobacterial community structure in response to nitrogen addition varied between two Mollisols differing in soil organic carbon

Intercropping can achieve sustainable agricultural development by increasing plant diversity. In this study, we investigated the effects of tomato monoculture and tomato/potato-onion intercropping systems on tomato seedling growth and changes of soil microbial communities in greenhouse conditions. Results showed that the intercropping with potato-onion increased tomato seedling biomass. Compared with monoculture system, the alpha diversity of soil bacterial and fungal communities, beta diversity and abundance of bacterial community were increased in the intercropping system. Nevertheless, the beta-diversity and abundance of fungal community had no difference between the intercropping and monoculture systems. The relative abundances of some taxa (i.e., Acidobacteria-Subgroup-6, Arthrobacter, Bacillus, Pseudomonas) and several OTUs with the potential to promote plant growth were increased, while the relative abundances of some potential plant pathogens (i.e., Cladosporium) were decreased in the intercropping system. Redundancy analysis indicated that bacterial community structure was significantly influenced by soil organic carbon and pH, the fungal community structure was related to changes in soil organic carbon and available phosphorus. Overall, our results suggested that the tomato/potato-onion intercropping system altered soil microbial communities and improved the soil environment, which may be the main factor in promoting tomato growth.

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Correction to: Vertical Redistribution of Soil Organic Carbon Pools After Twenty Years of Nitrogen Addition in Two Temperate Coniferous Forests

Ecosystems ◽

10.1007/s10021-019-00338-0 ◽

2019 ◽

Vol 22 (2) ◽

pp. 452-452

Author(s):

Stefan J. Forstner ◽

Viktoria Wechselberger ◽

Stefanie Müller ◽

Katharina M. Keiblinger ◽

Eugenio Díaz-Pinés ◽

...

Keyword(s):

Organic Carbon ◽

Soil Organic Carbon ◽

Nitrogen Addition ◽

Coniferous Forests ◽

Carbon Pools ◽

Soil Organic Carbon Pools

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Coupled changes in soil organic carbon fractions and microbial community composition in urban and suburban forests

Scientific Reports ◽

10.1038/s41598-020-73119-8 ◽

2020 ◽

Vol 10 (1) ◽

Author(s):

Xueying Zhang ◽

Xiaomei Chen ◽

Muying Liu ◽

Zhanying Xu ◽

Hui Wei

Keyword(s):

Community Structure ◽

Microbial Community ◽

Organic Carbon ◽

Soil Organic Carbon ◽

Community Composition ◽

Microbial Community Structure ◽

Soil Microorganisms ◽

Microbial Community Composition ◽

Soil C ◽

Suburban Forests

Abstract Climate change and rapid urbanization have greatly impacted urban forest ecosystems and the carbon (C) cycle. To assess the effects of urbanization on forest soil C and soil microorganisms, six natural forests in a highly-urbanized region were selected as the research objects. Soil samples were collected to investigate the content and fractions of the soil organic carbon (SOC), as well as the soil microbial community composition. The results showed that the SOC content and fractions were substantially lower in the urban forests than in the suburban forests. Meanwhile, the total amount of phospholipid fatty acids (PLFAs) at suburban sites was twice more than that at urban sites, with shifts in microbial community structure. The potential differences in C inputs and nutrient limitation in urban forests may aggravate the low quantity and quality of SOC and consequently impact microbial community abundance and structure. Variation in microbial community structure was found to explain the loss of soil C pools by affecting the C inputs and promoting the decomposition of SOC. Therefore, the coupled changes in SOC and soil microorganisms induced by urbanization may adversely affect soil C sequestration in subtropical forests.

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