Enhanced plant leaf P and unchanged soil P stocks after a quarter century of warming in the arctic tundra

Jennie R. McLaren; Kate M. Buckeridge

doi:10.1002/ecs2.3838

journal article Open Access Nov 01, 2021

Enhanced plant leaf P and unchanged soil P stocks after a quarter century of warming in the arctic tundra

Jennie R. McLaren

Kate M. Buckeridge

Ecosphere Vol. 12 No. 11 · Wiley

View at Publisher Save 10.1002/ecs2.3838

Abstract

AbstractPhosphorus (P) limits or co‐limits plant and microbial life in multiple ecosystems, including the arctic tundra. Although current global carbon (C) models focus on the coupling between soil nitrogen (N) and C, ecosystem P response to climate warming may also influence the global C cycle. Permafrost soils may see enhanced or reduced P availability under climate warming through multiple mechanisms including changing litter inputs through plant community change, changing plant–microbial dynamics, altered rates of mineralization of soil organic P through increased microbial activity, and newly exposed mineral‐bound P via deeper thaw. We investigated the effect of long‐term warming on plant leaf, multiple soil and microbial C, N, and P pools, and microbial extracellular enzyme activities, in Alaskan tundra plots underlain by permafrost. Here, we show that 25 yr of experimental summer warming increases community‐level plant leaf P through changing community composition to favour relatively P‐rich plant species. However, despite associated increases in P‐rich litter inputs, we found only a few responses in the belowground pools of P available for plant and microbial uptake, including a weak positive response for citric acid–extractable PO4 in the surface soil, a decrease in microbial biomass P, and no change in soil P (or C or N) stocks. This weak, neutral, or negative belowground P response to warming despite enhanced litter P inputs is consistent with a growing number of studies in the arctic tundra that find no long‐term response of soil C and N stocks to warming.

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Details

Published: Nov 01, 2021
Vol/Issue: 12(11)
License: View

Authors

J

Jennie R. McLaren

Department of Biological Sciences University of Texas at El Paso El Paso Texas 79968 USA

K

Kate M. Buckeridge

Department of Environmental Research and Innovation (ERIN) Luxembourg Institute of Science and Technology (LIST) 41 Rue du Brill 4422 Belvaux Luxembourg

Funding

Division of Environmental Biology Award: 1637459

Division of Polar Programs Award: 1603677

Cite This Article

Jennie R. McLaren, Kate M. Buckeridge (2021). Enhanced plant leaf P and unchanged soil P stocks after a quarter century of warming in the arctic tundra. Ecosphere, 12(11). https://doi.org/10.1002/ecs2.3838

Enhanced plant leaf P and unchanged soil P stocks after a quarter century of warming in the arctic tundra

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