摘要
[目的]探究一定流域范围内土地利用类型及社会经济因子对河流水质的影响情况。[方法]使用2012—2015年广元市嘉陵江、白龙江和南河的水质监测数据,选取5个分析指标,利用单因子指数与土地利用数据和社会经济数据进行回归分析,探讨土地利用类型与经济数据对河流水质的影响倾向,选取最优模型进行情景预测。[结果]①广元市2012—2015年区域河流水质较好,期间河流水质根据回归模型模拟结果与实际无显著差异,回归模型能够基本反映出广元市河流水质的实际变化趋势。②COD Mn、BOD 5、NH 4+-N的影响因子均包括年末实有耕地,且都呈负相关;COD Cr与人口密度呈现负相关;TP与草地面积呈负相关;BOD 5影响因子除了年末实有耕地面积外还有农业设施用地面积,并且与农业设施用地面积呈正相关。③土地利用类型对COD Mn、BOD 5、NH 4+-N、TP均有影响,COD Cr受到社会经济因子的影响,其中土地利用类型变化对河流水质影响作用比社会经济因子更显著。④增加年末实有耕地面积、减少农业设施用地面积、增加人口密度的情况下能使水质更好。[结论]在考量河流水质的影响因子时应当综合考虑土地利用类型和社会经济因子。
[Objective]To explore the impact of land use types and socio-economic factors on river water quality in a certain watershed.[Method]Using the water quality monitoring data of Jialing River,Bailong River and Nanhe River in Guangyuan City from 2012 to 2015,five analysis indexes were selected,and regression analysis was carried out with single factor index,land use data and socio-economic data to explore the impact tendency of land use type and economic data on river water quality,and the optimal model was selected for scenario prediction.[Result]①The regional river water quality in Guangyuan City was good from 2012 to 2015.During the period,the water quality of the river was not significantly different from the actual results according to the regression model.The regression model could basically reflect the actual change trend of river water quality in Guangyuan City.②The impact factors of COD Mn,BOD 5 and NH 4+-N include cultivated land at the end of the year,and they were negatively correlated.COD Cr was negatively correlated with population density,TP was negatively correlated with grassland area,and BOD 5 influence factor was positively correlated with agricultural facility area besides cultivated land area at the end of the year.③Land use types had an impact on COD Mn,BOD 5,NH 4+-N and TP,and COD Cr was affected by socio-economic factors.The impact of land use types on river water quality was more significant than that of socio-economic factors.④The water quality can be improved by increasing the area of cultivated land at the end of the year,reducing the area of agricultural facilities and increasing the population density.[Conclusion]Land use types and socio-economic factors should be considered comprehensively when exploring the influencing factors of river water quality.
作者
张萍
张倚铭
唐娅
郑清
权秋梅
黎云祥
ZHANG Ping;ZHANG Yi-ming;TANG Ya(College of Environmental Science and Engineering,China West Normal University,Nanchong,Sichuan 637009;Department of Pharmaceutical and Environmental Engineering,Sichuan Vocational College of Chemical Industry,Luzhou,Sichuan 646009)
出处
《安徽农业科学》
CAS
2020年第20期52-56,共5页
Journal of Anhui Agricultural Sciences
基金
西华师范大学教学改革项目(403619)。
