Long-term soil warming decreases microbial phosphorus utilization by increasing abiotic phosphorus sorption and phosphorus losses

Ye Tian (), Chupei Shi, Carolina Urbina Malo, Steve Kwatcho Kengdo, Jakob Heinzle, Erich Inselsbacher, Franz Ottner, Werner Borken, Kerstin Michel, Andreas Schindlbacher and Wolfgang Wanek ()
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Ye Tian: University of Vienna
Chupei Shi: University of Vienna
Carolina Urbina Malo: University of Vienna
Steve Kwatcho Kengdo: University of Bayreuth
Jakob Heinzle: Natural Hazards and Landscape-BFW
Erich Inselsbacher: University of Natural Resources and Life Sciences Vienna (BOKU)
Franz Ottner: University of Natural Resources and Life Sciences Vienna (BOKU)
Werner Borken: University of Bayreuth
Kerstin Michel: Natural Hazards and Landscape-BFW
Andreas Schindlbacher: Natural Hazards and Landscape-BFW
Wolfgang Wanek: University of Vienna

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract Phosphorus (P) is an essential and often limiting element that could play a crucial role in terrestrial ecosystem responses to climate warming. However, it has yet remained unclear how different P cycling processes are affected by warming. Here we investigate the response of soil P pools and P cycling processes in a mountain forest after 14 years of soil warming (+4 °C). Long-term warming decreased soil total P pools, likely due to higher outputs of P from soils by increasing net plant P uptake and downward transportation of colloidal and particulate P. Warming increased the sorption strength to more recalcitrant soil P fractions (absorbed to iron oxyhydroxides and clays), thereby further reducing bioavailable P in soil solution. As a response, soil microbes enhanced the production of acid phosphatase, though this was not sufficient to avoid decreases of soil bioavailable P and microbial biomass P (and biotic phosphate immobilization). This study therefore highlights how long-term soil warming triggers changes in biotic and abiotic soil P pools and processes, which can potentially aggravate the P constraints of the trees and soil microbes and thereby negatively affect the C sequestration potential of these forests.

Date: 2023
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DOI: 10.1038/s41467-023-36527-8

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