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Effects of long-term nitrogen addition on phosphorus cycling in organic soil horizons of temperate forests

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Abstract

High atmospheric nitrogen (N) deposition is expected to impair phosphorus (P) nutrition of temperate forest ecosystems. We examined N and P cycling in organic soil horizons of temperate forests exposed to long-term N addition in the northeastern USA and Scandinavia. We determined N and P concentrations, enzyme activities and net N and P mineralization rates in organic soil horizons of two deciduous (Harvard Forest, Bear Brook) and two coniferous (Klosterhede, Gårdsjön) forests which had received experimental inorganic N addition between 25 and 150 kg N ha−1 year−1 for more than 25 years. Long-term N addition increased the activity of phosphatase (+ 180%) and the activity of carbon (C)- and N-acquiring enzymes (cellobiohydrolase: + 70%, chitinase: + 25%). Soil N enrichment increased the N:P ratio of organic soil horizons by up to 150%. In coniferous organic soil horizons, net N and P mineralization were small and unaffected by N addition. In deciduous organic soil horizons, net N and P mineralization rates were significantly higher than at the coniferous sites, and N addition increased net N mineralization by up to 290%. High phosphatase activities concomitant with a 40% decline in P stocks of deciduous organic soil horizons indicate increased plant P demand. In summary, projected future global increases in atmospheric N deposition may induce P limitation in deciduous forests, impairing temperate forest growth.

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Acknowledgements

We thank Karin Söllner for her help in laboratory work and the BayCEER Laboratory for Analytical Chemistry for their chemical analyses. This study was funded by the German Research Foundation (DFG) as part of the Project SP 1389/4-1 of the priority program “Ecosystem nutrition: Forest strategies for limited phosphorus resources” (SPP 1685). Maintenance of the Chronic Nitrogen Amendment Study at Harvard Forest is supported by the U.S. National Science Foundation Long-term Ecological Research (LTER) Program.

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Correspondence to Marie Spohn.

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Responsible Editor: Edith Bai.

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Heuck, C., Smolka, G., Whalen, E.D. et al. Effects of long-term nitrogen addition on phosphorus cycling in organic soil horizons of temperate forests. Biogeochemistry 141, 167–181 (2018). https://doi.org/10.1007/s10533-018-0511-5

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  • DOI: https://doi.org/10.1007/s10533-018-0511-5

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