三峡库区山地小流域种植业面源污染发生风险评估体系研究——以黄金河流域为例

Risk Assessment System for Non-point source Pollution in Small Mountain Watersheds of the Three Gorges Reservoir Area:A Case Study of Huangjin River Basin

三峡库区山地小流域种植业生产呈区块化分布,种植区块可以作为种植业面源污染控制基本单元。山地小流域种植业面源污染发生风险评估包括区块划分、风险识别、风险评估、风险防控4个子过程,通过构建以风险因素筛选与量化为核心的风险评价模型,建立源因子和迁移因子2个维度的支撑评价指标体系,开展分地块面源污染发生风险评估并进行等级划分,依据单指标影响程度,从源头控制、过程控制和末端控制3个方面提出种植业面源污染针对性管控措施,指导生产和管理过程。

The plantation production in the mountainous sub-watersheds of the Three Gorges Reservoir Area is distributed in units of blocks.The plantation blocks can be used as the basic unit to implement non-point source pollution control.The risk assessment of non-point pollution in mountainous small watersheds includes four sub-processes:block division,risk identification,risk assessment,risk prevention and control.By constructing a risk evaluation model focusing on the screening and quantification of risk factors,and by establishing a supportive evaluation index system in the dimensions of source factors and migration factors,the risk assessment of plantation non-point pollution was carried out and graded.The targeted control and management of plantation non-point pollution was proposed in three aspects:source control,process control and end control,based on the influence of single index.Based on the influencing degree of single index,we proposed several targeted control measures for plantation non-point pollution control in three aspects including source control,process control and end control,to guide an improved management strategy.