Nitrogen transformation and pathways in the shallow groundwater-soil system within agricultural landscapes.
Agricultural ecosystems
Dual isotopic approach
Microbiological composition
Nitrate pollution
Nitrogen compounds
Poyang Lake wetland
Journal
Environmental geochemistry and health
ISSN: 1573-2983
Titre abrégé: Environ Geochem Health
Pays: Netherlands
ID NLM: 8903118
Informations de publication
Date de publication:
Jan 2021
Jan 2021
Historique:
received:
20
02
2020
accepted:
21
09
2020
pubmed:
2
10
2020
medline:
6
3
2021
entrez:
1
10
2020
Statut:
ppublish
Résumé
The present study considers the behavior of nitrogen compounds in the shallow groundwater-soil system as necessary for the functioning of the nitrogen cycle within agricultural landscapes and one of the first steps of the formation of groundwater chemical composition. Data were collected in 2011-2018 within the Poyang Lake area (Jiangxi Province, China), where agricultural landscapes prevail. The soil and groundwater samples were taken in different periods of an agricultural season at the beginning of the agricultural season (spring) and after harvesting (autumn). The combined geochemical data on the chemical and microbiological composition of the soils and shallow groundwater and isotopic data on dissolved nitrate allowed researchers to resolve that nitrogen enters the system in the form of organic compounds, particularly, due to the soil fertilization at the beginning of the agricultural season. Organic nitrogen compounds transform into nitrate under the influence of nitrifiers in the soil before getting the shallow aquifer, where the occurrence of denitrification is suggested. Within the Ganjiang and Xiushui interfluve, reducing conditions, together with the formation of clay minerals from the aqueous solution, may serve a geochemical barrier for the accumulation of nitrogen compounds preventing the transformation of ammonium to nitrate and providing its sorption. It also should be noted that bacterial diversity in the shallow groundwater has a strong relation with the amount of nitrate in the system, whereas in the soil, it is connected with sampling depth.
Identifiants
pubmed: 33000346
doi: 10.1007/s10653-020-00733-w
pii: 10.1007/s10653-020-00733-w
doi:
Substances chimiques
Nitrates
0
Soil
0
Water Pollutants, Chemical
0
Nitrogen
N762921K75
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
441-459Subventions
Organisme : Russian Science Foundation
ID : 17-77-10017
Organisme : Russian Science Foundation
ID : 19-77-00014
Organisme : Российский Фонд Фундаментальных Исследований (РФФИ)
ID : 18-55-80015
Organisme : National Natural Science Foundation of China
ID : 51861145308
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