TAILIEUCHUNG - Input and output of dissolved organic and inorganic nitrogen in subtropical forests of South China under high air pollution

There exists a range of solutions to reduce exposure to indoor air pollution. This includes reducing the source of pollution and altering the living environment and user behavior. Source reduction involves improved cooking devices (with or without flue attached), cleaner fuel, and reduced need for fire. Alterations to the living environment include improved ventilation and improved kitchen design and stove placement. Altered user behavior includes fuel drying, stove and chimney maintenance, use of pot lids to conserve heat, and keeping children away from the smoke (Bruce et al., 2005). While there are many options available for. | Biogeosciences Discuss. 4 4135-4171 2007 4 4135 2007 Author s 2007. This work is licensed under a Creative Commons License. Biogeosciences Discussions Biogeosciences Discussions is the access reviewed discussion forum of Biogeosciences BGD 4 4135-4171 2007 Input-output of N in subtropical forests under air pollution Y. Fang et al. Input and output of dissolved organic and inorganic nitrogen in subtropical forests of South China under high air pollution Y. T. Fang1 P. Gundersen2 J. M. Mo1 and W. X. Zhu3 1South China Botanical Garden the Chinese Academy of Sciences Guangzhou 510650 China 2Forest and Landscape Denmark Faculty of Life Sciences Univ. of Copenhagen Horsholm Kongevej 11 2970 Horsholm Denmark 3Depart. of Biological Sciences State Univ. of New York - Binghamton Binghamton NY 13902 USA Received 30 August 2007 - Accepted 29 October 2007 - Published 12 November 2007 Correspondence to Y T. Fang fangyt@ Title Page Full Screen Esc Printer-friendly Version Interactive Discussion 4135 EGU Abstract 5 10 15 20 25 The nitrogen N emissions to the atmosphere and are thereby N deposition to forest ecosystems increasing rapidly in Southeast Asia but little is known about the fate and effects elevated N deposition in warm and humid forests. Here we report the concentrations and fluxes of dissolved inorganic DIN and organic N DON in precipitation throughfall surface runoff and soil solution for three subtropical forests in a region of South China under high air pollution to investigate how deposited N is processed and examined the importance of DON in N budget. The precipitation DIN input was 3234 kg N ha-1 yr-1. An additional input of 18 kg N ha-1 yr-1 as DON was measured in 2005 which to our knowledge is the highest DON flux ever measured in precipitation. Dry deposition was of minor importance at the site. A canopy uptake of DIN was indicated in two young conifer dominated forests 72-85 of DIN input reached the floor in .

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