Abstract
The research is devoted to the analysis of the changes in the chemical composition of shallow groundwater within the agricultural landscapes of the Poyang Lake area taking into account the peculiarities of soil composition. The analysis is based on field data collected during 2011–2017 by the sampling of the shallow groundwater from the private and public wells and adjoining soils. Correlations between the content of the N-compounds and the Eh values in autumn as well as a relationship of the NH4+ concentration with the DOC content reflect the processes of the organic matter transformation in the aquifer. Correlations between the N content in the upper soil horizon and the concentrations of the N-compounds in the shallow groundwater indicate a strong connection of the origin of the groundwater chemical composition with the soil composition.
Highlights
The study of the shallow groundwater–soil system has a significant role in understanding the origin of the chemical composition of shallow groundwater, chemical element cycles, and element migration and transformation
This research, is mainly devoted to the study of elements behavior in groundwater and does not include the soils, while it is obvious that the shallow groundwater–soil system should be considered as a whole [e.g., 5, 6], because the formation of the chemical composition of shallow groundwater begins in a soil horizon
Such dependencies are not found for the samples taken in winter. It shows that the formation of the shallow groundwater chemical composition is in close relation with the rate of vegetation and agricultural activity, which are expressed in a different rate of an organic matter supply and destruction during the seasons of the year
Summary
The study of the shallow groundwater–soil system has a significant role in understanding the origin of the chemical composition of shallow groundwater, chemical element cycles, and element migration and transformation. This is important for agricultural landscapes, since the content and balance of chemical species in shallow groundwater, as well as in soils, are affected by a serious anthropogenic load due to crop cultivation. Nowadays there is considerable scientific research devoted to the origin of the groundwater chemical composition, transformation and migration of chemical elements in water, in particular under an anthropogenic influence [1,2,3,4]. Seasonal variations of the groundwater chemical composition were reported as a preliminary stage of the study of migration and transformation of chemical elements and their compounds under different degree of agricultural activity
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