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Inorganic nitrogen deposition in arid land ecosystems of Central Asia.
- Source :
-
Environmental science and pollution research international [Environ Sci Pollut Res Int] 2021 Jun; Vol. 28 (24), pp. 31861-31871. Date of Electronic Publication: 2021 Feb 22. - Publication Year :
- 2021
-
Abstract
- 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 <superscript>-1</superscript> yr <superscript>-1</superscript> across desert, grassland, desert-grassland, forest, farmland, and city/suburb ecosystems. Ammonia N deposition varied between 0.50 asnd 8.66 kg N ha <superscript>-1</superscript> yr <superscript>-1</superscript> , and nitrate N deposition c varied between 0.67 and 4.22 kg N ha <superscript>-1</superscript> yr <superscript>-1</superscript> , 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 NH <subscript>3</subscript> deposition made an important contribution (on average 40%) to total N deposition. Therefore, understanding the characteristics of Nr pollution especially NH <subscript>3</subscript> emission is indispensable to atmospheric pollution control in arid region.
Details
- Language :
- English
- ISSN :
- 1614-7499
- Volume :
- 28
- Issue :
- 24
- Database :
- MEDLINE
- Journal :
- Environmental science and pollution research international
- Publication Type :
- Academic Journal
- Accession number :
- 33616823
- Full Text :
- https://doi.org/10.1007/s11356-021-13022-5