Imbalanced nitrogen and phosphorus deposition in the urban and forest environments in southeast Tibet

Wang, Wei; Liu, Xuejun; Xu, Jin; Dore, Anthony J.; Xu, Wen. 2018 Imbalanced nitrogen and phosphorus deposition in the urban and forest environments in southeast Tibet. Atmospheric Pollution Research, 9 (4). 774-782. https://doi.org/10.1016/j.apr.2018.02.002

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Official URL: http://dx.doi.org/10.1016/j.apr.2018.02.002

Abstract/Summary

In recent decades, high levels of anthropogenic emissions in China have dramatically increased nitrogen (N) deposition and may lead to an imbalance of atmospheric N and phosphorus (P) inputs in terrestrial ecosystems. However, currently the status of N and P deposition in southeast Tibet is poorly understood. Here, we investigated spatial and monthly patterns of N and P bulk deposition based on measurements of dissolved inorganic N (DIN, including ammonium N and nitrate N) and dissolved organic N (DON) and total dissolved P (TDP) in precipitation from March to October 2017. Measurements were made at an urban site in Nyingchi city (NC) and at a forest site in Sejila Mountain (SJL). Over the study period, monthly total dissolved N (the sum of DIN and DON) deposition fluxes totalled 4.6 and 3.6 kg N ha−1 at SJL and NC, respectively, of which dissolved organic nitrogen accounted for 35 and 38%. Monthly averages showed an increasing trend from March to June, and then a decrease during last two months (September and October). At both two sites, the ratios of ammonium to nitrate N in bulk deposition are greater than 1, indicating that reduced N mainly from agricultural sources dominated N deposition in study area. Monthly TDP deposition fluxes totalled 0.68 and 0.58 kg P ha−1 at SJL and NC, respectively, both of which showed an increasing trend from March to May and a decreasing trend from July to October. The N/P ratio was 6.1 and 6.8 at NC and SJL, respectively.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1016/j.apr.2018.02.002
UKCEH and CEH Sections/Science Areas:	Atmospheric Chemistry and Effects (Science Area 2017-)
ISSN:	1309-1042
Additional Keywords:	nitrogen deposition, phosphorus deposition, N/P ratio, dissolved organic nitrogen deposition, Tibet plateau
NORA Subject Terms:	Atmospheric Sciences
Date made live:	28 Mar 2018 15:02 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/519716

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.1016/j.apr.2018.02.002

UKCEH and CEH Sections/Science Areas:

Atmospheric Chemistry and Effects (Science Area 2017-)

ISSN:

1309-1042

Additional Keywords:

nitrogen deposition, phosphorus deposition, N/P ratio, dissolved organic nitrogen deposition, Tibet plateau

NORA Subject Terms:

Atmospheric Sciences