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| Dynamics of Atmospheric Nitrogen Wet Deposition Fluxes in Guanzhong Area, Shaanxi |
| Received:July 22, 2014 |
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| KeyWord:atmospheric nitrogen deposition;wet deposition;Guanzhong area |
| Author Name | Affiliation | E-mail | | LIANG Ting | College of Resources and Environmental Sciences, Northwest A&F University, Yangling 712100, China | | | TONG Yan-an | College of Resources and Environmental Sciences, Northwest A&F University, Yangling 712100, China | tongyanan@nwsuaf.edu.cn | | LIU Xue-jun | China Agricultural University, Beijing 100094, China | | | QIAO Li | Atmospheric Detection Center of Xi'an, Xi'an 710100, China | |
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| Abstract: |
| Atmospheric nitrogen(N) deposition has long term impacts on the terrestrial and water ecosystems. In order to estimate the atmospheric N deposition fluxes in Guanzhong Area of Shaanxi Province, we monitored N wet deposition in Xi'an and Yangling from November 2009 to Octomber 2010. During the monitoring period, the annual rainfall of Xi'an and Yangling was 620.5 and 532.3 mm, respectively. The mean values of ρ(NH4+-N) and ρ(NO3--N) were respectively 3.058 and 2.356 mg·L-1 in Xi'an, and 3.990 and 2.709 mg·L-1 in Yangling. The ρ(NH4+-N) and ρ(NO3--N) in Xi'an and ρ(NH4+-N) in Yangling were higher in spring and winter than in summer and autumn, whereas ρ(NO3--N) in Yangling in autumn and winter was slightly higher than that in spring and summer. The fluxes of total inorganic nitrogen(TIN) deposition in Xi'an and Yangling were up to 24.791 and 28.894 kg·hm-2·a-1, mainly in form of NH4+-N that accounted for 67.3% and 56.3% of the TIN in two sites. The amount of nitrogen wet deposition was positively correlated with rainfall. The present results indicate that wet N deposition contributes to the field inorganic N inputs, which should be taken into consideration when applying fertilizers. |
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