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Weathering of calcareous bedrocks is strongly affected by the activity of soil microorganisms

Pastore, Giovanni and Weig, Alfons R. and Vazquez, Eduardo and Spohn, Marie (2022). Weathering of calcareous bedrocks is strongly affected by the activity of soil microorganisms. Geoderma. 405 , 115408
[Research article]

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Abstract

Phosphorus (P) availability in calcareous forest soils is commonly low compared to siliceous soils. The main reason for this is that phosphate ions tend to precipitate with calcium (Ca). Weathering of calcareous rocks and the potential of microorganisms to dissolve calcareous parent material is not fully understood. Therefore, we examined microbial carbonate dissolution and the abundance of phosphorus-solubilizing bacteria in temperate forest soils with contrasting calcareous parent materials. We incubated soil extracts with weathered parent materials (i.e., dolomite and limestone) from two calcareous forest soils differing in P content and determined the rates of P and Ca solubilization. In addition, we determined the abundance of phosphorus-solubilizing bacteria (PSB). We found that the net Ca solubilization rate ranged from 8.8 to 511.1 nmol m(-2) d(-1) across both soils and depths. Calcium dissolution rates were negatively related to pH and positively related to the concentration of organic acids. The gross P solubilization rates were on average 63.6% higher from dolomite (P-poor soil) than from limestone (P-rich soil). The abundance of soil PSB ranged from 3.8 % at the limestone site (P-rich soil) to 24.4 % at the dolomite site (P-poor soil). The higher abundance of PSB in the soil derived from dolomite is in line with the high Ca and P solubilization rates at this site, indicating that PSB abundance is related to rock weathering rates from calcareous soils. Pseudomonadales and Enterobacteriales were by far the two most abundant bacterial orders in the PSB community of both soils and soil depths. In conclusion, this study shows, first, that weathering of calcareous bedrocks is strongly affected by the activity of soil microorganisms, and second, that there is likely a selective pressure in P-poor soils towards a higher abundance of PSB.

Authors/Creators:Pastore, Giovanni and Weig, Alfons R. and Vazquez, Eduardo and Spohn, Marie
Title:Weathering of calcareous bedrocks is strongly affected by the activity of soil microorganisms
Series Name/Journal:Geoderma
Year of publishing :2022
Volume:405
Article number:115408
Number of Pages:10
Publisher:ELSEVIER
ISSN:0016-7061
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science
Keywords:Calcareous soils, Phosphate-solubilizing bacteria, Dolomite, Limestone, Phosphate solubilization, Phosphate adsorption
URN:NBN:urn:nbn:se:slu:epsilon-p-114013
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-114013
Additional ID:
Type of IDID
DOI10.1016/j.geoderma.2021.115408
Web of Science (WoS)000703712100018
ID Code:25870
Faculty:S - Faculty of Forest Sciences
Department:(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
Deposited By: SLUpub Connector
Deposited On:19 Oct 2021 06:25
Metadata Last Modified:19 Oct 2021 06:31

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