Abstract
The responses of temperate and boreal forest ecosystems to increased nitrogen (N) inputs have been varied, and the responses of soil N pools have been difficult to measure. In this study, fractions and pool sizes of N were determined in the forest floor of red spruce stands at four sites in the northeastern U.S. to evaluate the effect of increased N inputs on forest floor N. Two of the stands received 100 kg N ha−1yr−1 for three years, one stand received 34 kg N ha −1 yr−1 for six years, and the remaining stand received only ambient N inputs. No differences in total N content or N fractions were measured in samples of the Oie and Oa horizons between treated and control plots in the three sites that received N amendments. The predominant N fraction in these samples was amino acid N (31–45% of total N), followed by hydrolyzable unidentified N (16–31% of total N), acid-soluble N (18–22% of total N), and NH +4 -N (9–13% of total N). Rates of atmospheric deposition varied greatly among the four stands. Ammonium N and amino acid N concentrations in the Oie horizon were positively related to wet N deposition, with respective r2 values of 0.92 and 0.94 (n = 4, ρ < 0.05). These relationhips were somewhat stronger than that observed between atmospheric wet N deposition and total N content of the forest floor, suggesting that these pools retain atmospherically deposited N. The NH +4 -N pool may represent atmospherically deposited N that is incorporated into organic matter, whereas the amino acid N pool could result from microbial immobilization of atmospheric N inputs. The response of forest floor N pools to applications of N may be masked, possibly by the large soil N pool, which has been increased by the long-term input of N from atmospheric deposition, thereby overwhelming the short-term treatments.
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David, M.B., Cupples, A.M., Lawrence, G.B., Shi, G., Vogt, K., Wargo, P.M. (1998). Effect of Chronic Nitrogen Additions on Soil Nitrogen Fractions in Red Spruce Stands. In: Wieder, R.K., Novák, M., Černý, J. (eds) Biogeochemical Investigations at Watershed, Landscape, and Regional Scales. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-0906-4_18
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DOI: https://doi.org/10.1007/978-94-017-0906-4_18
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