Articles | Volume 13, issue 6
https://doi.org/10.5194/bg-13-1787-2016
https://doi.org/10.5194/bg-13-1787-2016
Research article
 | 
23 Mar 2016
Research article |  | 23 Mar 2016

Effects of different N sources on riverine DIN export and retention in a subtropical high-standing island, Taiwan

Jr-Chuan Huang, Tsung-Yu Lee, Teng-Chiu Lin, Thomas Hein, Li-Chin Lee, Yu-Ting Shih, Shuh-Ji Kao, Fuh-Kwo Shiah, and Neng-Huei Lin

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Short summary
The mean riverine DIN export of 49 watersheds in Taiwan is ∼ 3800 kg N km−2 yr−1, 18 times the global average. The mean riverine DIN export ratio is 0.30–0.51, which is much higher than the average of 0.20–0.25 of large rivers around the world, indicating excessive N input relative to ecosystem retention capacity. The DIN export ratio is positively related to agriculture input, and levels of human disturbance and watersheds with high DIN export ratios are likely at advanced stages of N excess.
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