Evolution of the groundwater chemical composition in the Poyang Lake catchment, China

Spatiotemporal Variation of Groundwater Recharge in the Lower Reaches of the Poyang Lake Basin, China: Insights From Stable Hydrogen and Oxygen Isotopes

“…As shown in Figure 4, the stable isotopes of precipitation exhibited significant seasonal variations, enriched in winter but depleted in the heavy isotopes in summer (the trend is shown by the gray arrow in Figure 4). Most of the groundwater samples were distributed along the GMWL (Global Meteoric Water Line) and the LMWL (Local Meteoric Water Line), and isotopic values of groundwater were in the range of local precipitation, indicating that groundwater was mainly derived from the infiltration replenishment of modern atmospheric precipitation, agreeing with previous conclusions (Liao, Wang, Shi, Huang, et al., 2018; Shvartsev et al., 2016; Zhan et al., 2016). Some samples plot below the LMWL, suggesting the effect of evaporation processes, but they were distributed in both seasons.…”

“…Some studies have been conducted on the origins of groundwater and hydrologic processes in Poyang Lake Basin by using environmental tracers and revealed that groundwater is predominantly recharged by precipitation and discharges into the Poyang lake (Soldatova et al., 2016; Zhan et al., 2016), which is consistent with the characteristics of wetlands (Hu et al., 2013). There also have been several investigations into the seasonal variations of groundwater isotopic compositions in the Poyang Lake Basin (Shen et al., 2015; Shvartsev et al., 2016). Nevertheless, knowledge gaps still exist in the spatiotemporal variations of hydrological cycles, particularly, in the spatial variations of groundwater stable isotopes and in the spatiotemporal variations of groundwater recharge in Poyang Lake Basin.…”

Nitrogen behavior in the shallow groundwater–soil system within agricultural landscapes

“…However, there are no statistically significant differences between the average concentrations of the components in the different seasons of the year. Thus, it was decided along with a vegetative activity to take into account the peculiarities of the soil composition, which in the study area varies drastically depending on the degree and the peculiarities of agricultural activity [7].…”

“…It should be noted that when selecting the sampling points, attention was paid to the degree of agricultural development of the area, which affects the formation of the chemical composition of the shallow groundwater and the mineralogical composition of the soils and the weathering crust as previous studies have shown [7,8]. According to the field observations, the sampling points S82-S85 are located to the well-developed areas, and the sampling points S86-S88 are located in the poorly developed areas in terms of the level of agricultural development.…”

Способ Оценки Допустимых Концентраций Загрязняющих Веществ С Учетом Состояния Донных Отложений

“…Воды р. Ганьцзян и ее притоков, а также грунтовые воды в речных долинах пресные с малой и средней минерализацией, гидрокарбонатные кальциевые, от олигосапробных (речные воды) до мезосапробных (речные и грунтовые воды) [34][35][36][37]. Изученные сточные воды пресные с большим разбросом содержаний растворенных веществ; хозяйственно-бытовые стоки гидрокарбонатные кальциевые, производственные сульфатные натриевые (табл.…”