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Microbial solubilization of silicon and phosphorus from bedrock in relation to abundance of phosphorus-solubilizing bacteria in temperate forest soils

Pastore, Giovanni and Kernchen, Sarmite and Spohn, Marie (2020). Microbial solubilization of silicon and phosphorus from bedrock in relation to abundance of phosphorus-solubilizing bacteria in temperate forest soils. Soil Biology and Biochemistry. 151 , 108050
[Journal article]

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Abstract

Biogeochemical weathering of bedrock is the most important input of silicon (Si) and phosphorus (P) to forest ecosystems. While soil microbes, and in particular P-solubilizing bacteria (PSB), are known to accelerate the solubilization of Si and P from silicate rocks, our understanding of the mechanisms driving biogenic weathering are still limited. To fill this gap, incubation experiments with weathered parent materials (i.e. basalt, andesite and paragneiss) of four soils and water extracts of the four soils, differing in P stocks, were conducted. We found that the net Si solubilization rate ranged from 5.0 (+/- 1.8) to 91.0 (+/- 2.4) nmol m(-2) d(-1) across all examined soils. The silicate dissolution rates were negatively related to the decrease in pH (ApH) and positively related to the amounts of organic acids released by microbes. We found that the gross P solubilization rates from the parent materials were similar to 11 times higher at the P-rich site (BBR) compared to the P-poor site (CON). In addition, we determined the abundance and the taxonomic composition of PSB communities in the four soils. The abundance of PSB ranged from 2% at the P-rich site to 22.1% at the P-poor site, indicating that a selective pressure exists in P-poor soils towards a higher abundance of P-solubilizers. Yet, despite the relative high abundance of PSB, the gross P solubilization rates were low in the soils derived from P-poor parent material. The genus Pseudomonas was found only in the PSB community at the P-poor site. Burkholderiales and Bacillales together were by far the two most abundant orders among the PSB communities in all soils and depths. In conclusion, this study shows that PSB are more abundant in P-poor soil than in P-rich soil, while the weathering rate seems to be mostly dependent on the bedrock.

Authors/Creators:Pastore, Giovanni and Kernchen, Sarmite and Spohn, Marie
Title:Microbial solubilization of silicon and phosphorus from bedrock in relation to abundance of phosphorus-solubilizing bacteria in temperate forest soils
Series Name/Journal:Soil Biology and Biochemistry
Year of publishing :2020
Volume:151
Article number:108050
Number of Pages:12
Publisher:PERGAMON-ELSEVIER SCIENCE LTD
ISSN:0038-0717
Language:English
Publication Type:Journal 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:Biogenic rock weathering, Silicate weathering, P-solubilizing bacteria, Phosphorus solubilization, Silicon solubilization, Organic acids
URN:NBN:urn:nbn:se:slu:epsilon-p-110114
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-110114
Additional ID:
Type of IDID
DOI10.1016/j.soilbio.2020.108050
Web of Science (WoS)000593230900023
ID Code:21453
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
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:21 Jan 2021 16:03
Metadata Last Modified:21 Jan 2021 16:11

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