Inorganic nitrogen deposition in arid land ecosystems of Central Asia

Li, Kaihui; Liu, Xuejun; Geng, Fengzhan; Xu, Wen; Lv, Jinling; Dore, Anthony J.. 2021 Inorganic nitrogen deposition in arid land ecosystems of Central Asia. Environmental Science and Pollution Research, 28 (24). 31861-31871.

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Atmospheric reactive nitrogen (Nr) pollution leads to enhanced Nr deposition. There still big gaps in understanding atmospheric nitrogen deposition because of limited monitoring sites in arid land ecosystems of Central Asia. To determine Nr concentrations and deposition in the study area, we have set up 20 monitoring sites to collect gaseous, particulate, and precipitation samples and measure their Nr components since 2009. Nr concentrations in air showed large spatial variations. Based on the Nr concentrations, dry deposition was calculated using the monthly average Nr concentrations by the corresponding deposition velocities modeled, which was varied between 3.15 and 27.92 kg N ha-1 yr-1 across desert, grassland, desert-grassland, forest, farmland, and city/suburb ecosystems. Ammonia N deposition varied between 0.50 asnd 8.66 kg N ha-1 yr-1, and nitrate N deposition c varied between 0.67 and 4.22 kg N ha-1 yr-1, respectively, in precipitation. Annual N deposition is following the order of desert (4.0) < grassland (6.0) < desert-grassland (7.6) < forest (16.1) < farmland (18.4) < city/suburb (35.4) ecosystems. Dry deposition contributed 52.7, 53.8, 100, 68.2, 73.7, and 78.9% of total N deposition in grassland, desert-grassland, desert, forest, farmland and city/suburb ecosystems, respectively. Reduced nitrogen deposition accounted for 62% of total N deposition in the arid area. Dry NH3 deposition made an important contribution (on average 40%) to total N deposition. Therefore, understanding the characteristics of Nr pollution especially NH3 emission is indispensable to atmospheric pollution control in arid region.

Item Type: Publication - Article
Digital Object Identifier (DOI):
UKCEH and CEH Sections/Science Areas: Atmospheric Chemistry and Effects (Science Area 2017-)
ISSN: 0944-1344
Additional Information. Not used in RCUK Gateway to Research.: Publisher link (see related URLs) provides a read-only full-text copy of the published paper.
Additional Keywords: dry deposition, reduced nitrogen, ecosystem, air pollution, Central Asia
NORA Subject Terms: Ecology and Environment
Atmospheric Sciences
Related URLs:
Date made live: 19 Mar 2021 11:46 +0 (UTC)

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