河套灌区种植业面源污染风险空间格局识别以内蒙古巴彦淖尔市五原县为例

Identification of spatial pattern of non-point source pollution risk from planting industry in Hetao Irrigation Area: a case study of Wuyuan County in Bayannur, Inner Mongolia

  • 摘要: 种植业面源污染是引起水体污染的重要原因之一,识别种植业面源污染风险区域有助于合理分配防治资源,是有效防控面源污染的重要手段。基于最小累积阻力模型开展河套灌区种植业面源污染风险空间格局识别,在土地利用的源分级基础上,选取种植业氮/磷排放量、化肥施用量、土壤有效氮/磷含量为源因子,植被覆盖、土壤类型、土壤结构、降水量、距与水体和道路距离为迁移因子,应用GIS技术进行源地识别和阻力基面构建,评估了内蒙古巴彦淖尔市五原县种植业面源污染风险空间格局。结果表明:氮源地和磷源地分别占研究区域面积的11.2%和2.2%,氮源地主要分布于新公中镇、巴彦套海镇、胜丰镇、隆兴昌镇、塔尔湖镇;磷源地主要集中在新公中镇。研究区域阻力基面的阻力值表现为西高东低,影响污染物流失的关键迁移因子是降水量和土壤类型,其权重分别为0.389和0.298。种植业面源污染风险的高、较高、中等、低、较低风险区面积分别占研究区域面积的49.7%、16.9%、7.8%、3.5%、2.1%,高风险区主要集中在巴彦套海镇、胜丰镇、隆兴昌镇和新公中镇。研究显示,河套灌区种植业面源污染风险偏高,亟须通过源头减量、过程拦截等系统性措施实施综合治理。

     

    Abstract: The non-point source (NPS) pollution from planting industry is one of the significant causes of water pollution. Identifying the risk areas of NPS pollution helps to allocate the prevention and control resources reasonably and is an important means to prevent NPS pollution effectively. Based on the Minimum Cumulative Resistance (MCR) Model, the spatial pattern identification of NPS pollution risk in the Hetao Irrigation Area was carried out. Based on land use "source" classification, nitrogen/phosphorus emissions, fertilizer application amount, and soil available nitrogen/phosphorus content were selected as source factors, while vegetation cover, soil type, soil structure, rainfall, and distance from water bodies and roads were selected as migration factors. GIS technology was used to identify the "source" areas, construct resistance base, and evaluate the spatial pattern of NPS pollution risk in Wuyuan County, Bayannur, Inner Mongolia. The results showed that nitrogen and phosphorus "source" areas accounted for 11.2% and 2.2% of the study area, respectively. Nitrogen "source" areas were mainly distributed in the towns of Xingongzhong, Bayantaohai, Shengfeng, Longxingchang, and Taerhu; Phosphorus "source" areas were concentrated in Xingongzhong Town. The resistance values of the resistance base in the study area showed a trend of high in the west and low in the east. The key migration factors affecting pollutant loss were rainfall and soil type, with weights of 0.389 and 0.298, respectively. The areas of high, higher, medium, lower, and low risk of NPS pollution from planting industry accounted for 49.7%, 16.9%, 7.8%, 3.5%, and 2.1% of the study area, respectively. The high-risk areas were mainly concentrated in the towns of Bayantaohai, Shengfeng, Longxingchang, and Xingongzhong. The research results show that the risk of NPS pollution from the planting industry in the Hetao Irrigation District is relatively high, and it is urgently necessary to implement comprehensive management through systematic measures such as source reduction and process interception .

     

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