乌鲁木齐市区大气氮素干沉降的输入性分析

Abstract

Abstract: Atmospheric concentrations of NH₃, NO₂, particulate NH₄⁺ (PNH₄⁺) and NO₃^- (PNO₃^-) were measured from the samples collected with passive samplers and particulate samplers in Urumqi and its suburbs during the period from August 2009 to March 2010 to estimate atmospheric dry deposition of nitrogen (N) in this region. The results show that NH₃ concentration at the Institute of Soil and Fertilizer Research (ISFR, suburban site) was higher than that at the Xinjiang Institute of Ecology and Geography (XIEG, urban site), while the concentrations of other atmospheric reactive N compositions (NO₂, particulate NH₄⁺ and NO₃^-) were higher at XIEG than those at ISFR. The mean concentrations of NH₃-N, NO₂-N, PNH₄⁺-N, PNO₃^--N and PM₁₀ (particulate matters with aerodynamic diameter less than 10 μm) at XIEG were 4.49, 4.31, 2.52, 11.84 and 225 μg/m³, and those at ISFR were 4.63, 2.32, 2.34, 7.59 and 188 μg/m³, respectively. Based on the measured concentrations and the dry deposition velocities cited from the references, it was estimated that the atmospheric dry deposition of N was 28.7 kg/(hm²·a) during the sampling period at XIEG and 21.6 kg/(hm²·a) at ISFR, in which the proportion of NH_x (NH₃+ PNH₄⁺) accounted for 65.7% at XIEG and 69.4% at ISFR, NH₃ was dominant during the period from August to November, and PNH₄⁺ was dominant during the period from December to next March.

Key words: atmospheric nitrogen deposition, dry deposition, reactive nitrogen, ecological effect, Urumqi

CLC Number:

X511

ZHANG Wei, LIU Xue-jun, HU Yu-kun, LI Kai-hui, SHEN Jian-lin, LUO Xiao-sheng, SONG Wei. Analysis on Input of Atmospheric Nitrogen Dry Deposition in Urumqi[J]., 2011, 28(4): 710-716.

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Analysis on Input of Atmospheric Nitrogen Dry Deposition in Urumqi

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