Temporal and spatial changes of soil water and nitrogen in different agricultural lands in Xiong'an New Area
This paper explored the temporal and spatial variation law of soil water and nitrogen to provide a theoretical basis for controlling groundwater pollution in Xiong'an new area,which is of great significance to the construction of"blue-green Xiong'an".We selected cultivated land,forest land and vegetable land in Xiong'an New area as the research object whose soil indexes such as soil moisture content,nitrate nitrogen,ammonium nitrogen and bulk density were measured.Then we analyzed the temporal and spatial variation laws and influencing factors of soil moisture content,nitrate nitrogen and ammonium nitrogen of different agricultural lands.The results showed that the soil moisture content first increased and then decreased with the depth of the soil layer and finally tend to be stable in the vertical direction of the soil layer.The content of nitrate nitrogen in cultivated land and vegetable soil increased first and then decreased with the increase of soil depth.The content of ammonium nitrogen in cultivated land,forest land and vegetable soil decreased gradually with the increase of soil depth.In terms of time,the water content of cultivated land fluctuated greatly,and the change of forest land was less affected by seasons.The water content of vegetable field changed steadily with time,and decreased significantly after October.The content of nitrate nitrogen in forest land and vegetable soil first increased and then decreased with time,while the content of cultivated land fluctuated sinusoidally with time.The content of ammonium nitrogen in vegetable soil decreased gradually with time,and the content of ammonium nitrogen in forest soil changed little and the content was the smallest.The soil moisture content of the three agricultural lands was negatively correlated with soil bulk density and significantly positively correlated with precipitation and irrigation(P＜0.05).The soil bulk density of cultivated land was significantly correlated with the depth of soil layer(P＜0.01).Nitrate nitrogen and ammonium nitrogen in cultivated land and vegetable soil were significantly negatively correlated with soil depth,precipitation and irrigation.There was a significant positive correlation between soil nitrate nitrogen and ammonium nitrogen in the three agricultural lands.The distribution of water and nitrogen content in cultivated land and vegetable land has a greater impact on groundwater pollution.Therefore,reasonable irrigation and application of nitrogen fertilizer to improve soil properties will help to protect the groundwater environment in Xiong'an New Area.
Xiong'an New Areaagricultural land typesoil moisture contentnitrate nitrogenammonium nitrogen
万方数据
维普
