Abstract
The impact of nitrogen (N) deposition on dissolved organic carbon (DOC) fractions in throughfall is not well understood. We performed a laboratory experiment and compared DOC leaching from canopy leaves after dipping leaves in pure water (control) and NH4NO3 solution (N-treatment) for 18 h. Net changes of DOC, NH4+, NO3−, SO42−, K+, Mg2+, Ca2+ and H+ contents after dipping leaves were determined by comparing solutions with and without leaves. We recorded no differences of DOC leaching between control and N-treatment, implying that N deposition had minor impacts on canopy DOC production. This confirmed that previous experiments testing the effects of N addition on DOC dynamics without considering the effects of the canopy reaction successfully described the real situation. We also confirmed the previously-reported canopy exchange process in spite of a high background N deposition at our study site. N-treatment significantly increased base cation leaching, especially K+, and the increase was positively correlated with foliar NH4+ retention. Net leaching of H+ and SO42− was not affected by the N-treatment.
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Project funding: This study was financially supported by a grant from National Natural Science Foundation of China (31370011), and The Sumitomo Foundation (153082), JSPS KAKENHI Postdoctoral Fellowships for Research Abroad (28 601), and National Natural Science Foundation of China (611361001).
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Corresponding editor: Zhu Hong.
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Mori, T., Zhou, K., Wang, S. et al. Effect of nitrogen addition on DOC leaching and chemical exchanges on canopy leaves in Guangdong Province, China. J. For. Res. 30, 1707–1713 (2019). https://doi.org/10.1007/s11676-018-0800-9
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DOI: https://doi.org/10.1007/s11676-018-0800-9