Ammonia volatilization following nitrogen fertilization with enhanced efficiency fertilizers and urea in loblolly pine (Pinus taeda L.) plantations of the southern United States

FOREST ECOLOGY AND MANAGEMENT

卷:376

Article

Raymond, Jay E.¹  Fox, Thomas R.¹  Strahm, Brian D.¹  Zerpa, Jose¹ 

[1] Virginia Tech, Dept Forest Resources & Environm Conservat 0324, 228 Cheatham Hall, Blacksburg, VA 24061 USA

关键词: N-15;    Forest fertilization;    Enhanced efficiency fertilizers;    Plantation forestry;    Ammonia volatilization;    Loblolly pine;   

DOI  :  10.1016/j.foreco.2016.06.015

来源: Elsevier

【 摘 要 】

Ammonia (NH3) volatilization losses following surface application of urea and three enhanced efficiency nitrogen (N) containing fertilizers (EEFs) were compared in six thinned mid-rotation loblolly pine (Pinus taeda L.) stands across the southern United States. All fertilizer treatments were labeled with N-15 (similar to 370%., 0.5 AP) and applied during two different seasons (spring, summer) in 2011 to open chamber microcosms. Individual microcosms were sampled 1, 15 and 30 days after fertilization to estimate remaining N-15. Losses of fertilizer N were determined using a mass balance calculation. Significantly less N loss occurred following fertilization with EEFs compared to urea after all sampling days for both seasons. Because root uptake was eliminated in the microcosms and there was no leaching of N-15 below the microcosms, the most likely loss pathway of the N-15 from the microcosms was NH3 volatilization. There were generally no differences among the individual EEFs. Following spring application, the mean NH3 volatilization during the 30 day experiment ranged from 4% to 26% for the EEFs compared to 26-40% for urea. In summer, mean NH3 volatilization for EEFs ranged from 8% to 23% compared to 29-49% for urea. This research highlights the potential of EEFs to reduce loss of fertilizer N in forest systems, potentially increasing fertilizer N use efficiency in these pine plantations. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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