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Minor response of gross N turnover and N leaching to drying, rewetting and irrigation in the topsoil of a Norway spruce forest

2011; Wiley; Volume: 62; Issue: 5 Linguagem: Inglês

10.1111/j.1365-2389.2011.01388.x

1365-2389

Yuting Chen, Christina Bogner, Werner Borken, Claus Florian Stange, E. Matzner,

Soil erosion and sediment transport

European Journal of Soil ScienceVolume 62, Issue 5 p. 709-717 Minor response of gross N turnover and N leaching to drying, rewetting and irrigation in the topsoil of a Norway spruce forest Y.-T. Chen, Y.-T. Chen Soil Ecology, Bayreuth Centre of Ecology and Environmental Research (BayCEER), University of Bayreuth, D-95440 Bayreuth, GermanySearch for more papers by this authorC. Bogner, C. Bogner Ecological Modelling, Bayreuth Centre of Ecology and Environmental Research (BayCEER), University of Bayreuth, D-95440 Bayreuth, GermanySearch for more papers by this authorW. Borken, W. Borken Soil Ecology, Bayreuth Centre of Ecology and Environmental Research (BayCEER), University of Bayreuth, D-95440 Bayreuth, GermanySearch for more papers by this authorC. F. Stange, C. F. Stange Soil Physics, Helmholtz Centre for Environmental Research, UFZ, D-06120 Halle/Saale, GermanySearch for more papers by this authorE. Matzner, Corresponding Author E. Matzner Soil Ecology, Bayreuth Centre of Ecology and Environmental Research (BayCEER), University of Bayreuth, D-95440 Bayreuth, GermanyE. Matzner. E-mail: [email protected]Search for more papers by this author Y.-T. Chen, Y.-T. Chen Soil Ecology, Bayreuth Centre of Ecology and Environmental Research (BayCEER), University of Bayreuth, D-95440 Bayreuth, GermanySearch for more papers by this authorC. Bogner, C. Bogner Ecological Modelling, Bayreuth Centre of Ecology and Environmental Research (BayCEER), University of Bayreuth, D-95440 Bayreuth, GermanySearch for more papers by this authorW. Borken, W. Borken Soil Ecology, Bayreuth Centre of Ecology and Environmental Research (BayCEER), University of Bayreuth, D-95440 Bayreuth, GermanySearch for more papers by this authorC. F. Stange, C. F. Stange Soil Physics, Helmholtz Centre for Environmental Research, UFZ, D-06120 Halle/Saale, GermanySearch for more papers by this authorE. Matzner, Corresponding Author E. Matzner Soil Ecology, Bayreuth Centre of Ecology and Environmental Research (BayCEER), University of Bayreuth, D-95440 Bayreuth, GermanyE. Matzner. E-mail: [email protected]Search for more papers by this author First published: 26 August 2011 https://doi.org/10.1111/j.1365-2389.2011.01388.xCitations: 11Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract Forest floors in the temperate climate zone are frequently subjected to strong changes in soil moisture, but the consequences for the soil N cycle are poorly known. In a field experiment we tested the hypotheses that soil drying leads to a decrease of gross N turnover and that natural rewetting causes a pulse of gross N turnover and an increase of N leaching from the forest floor. A further hypothesis was that optimal water availability induced by irrigation causes maximum N turnover and N leaching. Replicated control, throughfall exclusion and irrigation plots were established in a Norway spruce forest to simulate different precipitation patterns during a growing season. Gross N turnover rates were determined in undisturbed soil cores from Oi + Oe and Oa + EA horizons by the 15N pool dilution technique. Forest floor percolates were periodically collected by suction plates. After 142 mm throughfall was excluded, the median soil water potential at the throughfall exclusion plots increased from pF 1.9 to 4.5 in the Oi + Oe horizon and from pF 1.8 to 3.8 in the Oa + EA horizon. Gross ammonification ranged from 14 to 45 mg N kg−1 soil day−1 in the Oi + Oe horizon and from 4.6 to 11.4 mg N kg−1 soil day−1 in the Oa + EA horizon. Gross ammonification of both horizons was smallest in the throughfall exclusion plots during the manipulation, but the differences between all treatments were not statistically significant. Gross nitrification in both horizons was very small, ranging from 1.6 to 11.1 mg N kg−1 soil day−1. No effects of decreasing water potential and rewetting on gross nitrification rates were observed because of the small rates and huge spatial variations. Irrigation had no effect as the differences from the control in soil water potential remained small. N leaching from the forest floor was not affected by the treatments. 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