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Availability of residual fertilizer 15 N from forest floor and mineral soil to Douglas-fir seedlings ten years after fertilization

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Abstract

Background and aims

As low initial uptake and essentially zero later uptake limit efficacy of N fertilization for temperate conifers, we investigated factors limiting long-term tree uptake of residual 15 N-labeled fertilizer.

Methods

We used a pot bioassay to assess availability of 15 N from soil sampled 10 years after fertilization of a Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) stand with 15 N-urea (200 kg N ha−1). Douglas-fir seedlings were grown for 2 years in organic (designated LFH) and mineral soil (0–10 cm) layers reconstructed from control and fertilized plots; residual fertilizer N amounted to 10 % of LHF and 5 % of MIN N.

Results

Percentage recovery of residual 15 N in seedlings was not affected by the original season of fertilization (spring vs. fall), but differed by the source of 15 N excess. LFH was a better source of residual 15 N; 12.4 % of residual LFH 15 N was taken up by seedlings and 7.6 % transferred to soil, whereas mineral soil yielded only 8.3 % of residual 15 N to seedling uptake and 2.4 % to LFH. Extractable inorganic N was 2–3 orders of magnitude higher in fallow pots.

Conclusions

Ten-year residual fertilizer 15 N was clearly cycling between LFH and mineral soil and available to seedlings, indicating that other factors such as denitrification, leaching, and asynchrony of soil N mineralization and tree uptake limit long-term residual N fertilizer uptake in the field.

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Acknowledgments

We are very grateful to Mel Scott, Forestry Consultant, for additional information on forest N fertilization in BC. Lisa Ganio, Oregon State University, kindly provided statistical advice and guidance.

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Correspondence to Caroline M. Preston.

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Responsible Editor: Stefano Manzoni.

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Swanston, C.W., Preston, C.M. Availability of residual fertilizer 15 N from forest floor and mineral soil to Douglas-fir seedlings ten years after fertilization. Plant Soil 381, 381–394 (2014). https://doi.org/10.1007/s11104-014-2132-7

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