Diurnal variation of nitric oxide emission flux from a mangrove wetland in Zhangjiang River Estuary,China |
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| Authors: | Juan Chen Fei-Hua Wu Qiang Xiao Zhang-Hua Yang Sheng-Kai Huang Jian Wang Yu-Guang Wu Xue-Jun Dong Zhen-Ming Pei Hai-Lei Zheng |
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| Institution: | 1. Key Laboratory for Subtropical Wetland Ecosystem Research of Ministry of Education of China, Xiamen University, Xiamen 361005, PR China;2. School of Life Sciences, Xiamen University, Xiamen 361005, PR China;3. Laboratory of Biological Resources Protection and Utilization of Hubei Province, Hubei Institutes for Nationalities, Enshi 445000, PR China;4. Center for Environmental Monitoring, Xiamen Environmental Protection Agency, Xiamen 361005, PR China;5. Central Grasslands Research Extension Center, North Dakota State University, Streeter, ND 58483, USA;6. Department of Biology, Duke University, Durham, NC, USA;g State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, PR China |
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| Abstract: | The diurnal variation of nitric oxide (NO) emission fluxes from a Kandelia obovata and Avicennia marina mangrove wetland were studied in the Zhangjiang River Estuary Mangrove National Nature Reserve using a dynamic chamber-based technique and a chemiluminescent analyzer. Results from field experiments show that NO emission from K. obovata and A. marina sampling sites reached maximal values of 1.07 ng N m−2 s−1 and 1.23 ng N m−2 s−1, respectively after the night tide. Meanwhile NO emission maintained at a steady lower level in daytime for both wetland sites. In laboratory experiments, NO emission from the mangrove wetland soil samples treated with simulated tides in the darkness exhibited higher values than those in the light, therefore it seems that tides and darkness could increase NO emission from mangrove wetlands, while intensive light, high temperature, and dryness in the daytime decreased NO emission. Compared with K. obovata soil samples, the diurnal average NO emission rate of the A. marina site was significantly higher, which was closely related to relatively higher diurnal average CO2 emission rate, soil available nitrogen content and soil net nitrification rate of the A. marina site. Moreover, soil samples of the A. marina site were more responsive to simulated tides and the addition of nitrogen than those of the K. obovata site. |
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| Keywords: | estuaries nitrogen mangroves tides wetlands zhangjiang River Estuary |
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