The influence of soil physics and chemical properties on groundwater nitrogen pollution in the riparian zone of Shaying River
Taking the typical section of Shaying River as the research object,we collected river water,soil and groundwater samples from riparian zones and analyzed the physicochemical indexes,aiming to deeply explore the impact mechanism of soil physical and chemical properties on groundwater nitrogen concentration in the riparian zones.The results showed that the total nitrogen(TN)content in farmland riparian soils is higher than that of the riparian zone of orchards,indicating a 1.15 times higher TN content.The TN contents of the riparian soils were highest at about 200m from the river bank.There is a certain response relationship between groundwater and soil nitrogen content in the riparian zone,showing similar spatial distribution characteristics.Groundwater NO3--N concentrations in the riparian zone of agricultural fields(0.56～25.17mg/L)were significantly higher than those in the riparian zone of orchards(0～0.97mg/L);groundwater NO3--N concentrations in the far bank(>200m)were significantly higher than those in the near bank(<100m).Soil nitrogen is one of the main sources of nitrogen pollution in riparian groundwater.The high content of clay particles in the soil and the amount of nitrogen application make the soil particles more likely to adsorb NO3--N.It increases the risk of nitrogen pollution in riparian groundwater.This study reveals the influence mechanism of soil physical and chemical properties on groundwater nitrogen content in the riparian zones.It provides a reference for the prevention and control of groundwater nitrogen pollution in locally.These findings could help develop feasible land management strategies to slow or prevent the further spread of groundwater nitrogen contamination.
Shaying Riverriparian zonesoil physical and chemical propertiesnitrogen content in groundwaterinfluence mechanism
NETL
NSTL
万方数据
