The effect of microbial diversity and biomass on microbial respiration in two soils along the soil chronosequence

0564377 - BC 2023 RIV CH eng J - Journal Article
Vicena, J. - Ardestani, Masoud Mortazavi - Baldrian, Petr - Frouz, Jan
The effect of microbial diversity and biomass on microbial respiration in two soils along the soil chronosequence.
Microorganisms. Roč. 10, č. 10 (2022), č. článku 1920. E-ISSN 2076-2607
R&D Projects: GA MŠMT(CZ) LM2015075; GA MŠMT(CZ) EF16_013/0001782; GA MŠMT(CZ) 8I20001
Institutional support: RVO:60077344 ; RVO:61388971
Keywords : carbon availability * decomposition of soil organic matter * fungal biomass * leaf litter * microbial biomass * microbial diversity
OECD category: Soil science; Microbiology (MBU-M)
Impact factor: 4.5, year: 2022
Method of publishing: Open access
https://www.mdpi.com/2076-2607/10/10/1920

Microbial diversity plays an important role in the decomposition of soil organic matter. However, the pattern and drivers of the relationship between microbial diversity and decomposition remain unclear. In this study, we followed the decomposition of organic matter in soils where microbial diversity was experimentally manipulated. To produce a gradient of microbial diversity, we used soil samples at two sites of the same chronosequence after brown coal mining in Sokolov, Czech Republic. Soils were X-ray sterilized and inoculated by two densities of inoculum from both soils and planted with seeds of six local plant species. This created two soils each with four levels of microbial diversity characterized by next-generation sequencing. These eight soils were supplied, or not, by litter of the bushgrass Calamagrostis epigejos, and microbial respiration was measured to assess the rate of decomposition. A strong positive correlation was found between microbial diversity and decomposition of organic matter per gram of carbon in soil, which suggests that microbial diversity supports decomposition if the microbial community is limited by available carbon. In contrast, microbial respiration per gram of soil negatively correlated with bacterial diversity and positively with fungal biomass, suggesting that in the absence of a carbon limitation, decomposition rate is controlled by the amount of fungal biomass. Soils with the addition of grass litter showed a priming effect in the initial stage of decomposition compared to the samples without the addition of litter. Thus, the relationship between microbial diversity and the rate of decomposition may be complex and context dependent.
Permanent Link: https://hdl.handle.net/11104/0336973