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县域是中国基本的行政管理单元,探讨县域尺度下土壤磷素流失风险评估的简化方法,旨在为县域磷风险评估和生产实践提供指导。该文在充分考虑县域尺度的特点,简化磷指数评估方法指标和评估过程,并以北京市顺义区为例,基于数字土壤系统,采用地理信息系统和计量土壤学技术,采用简化后的磷指数法对顺义区磷素流失风险进行评估。结果显示,顺义区土壤磷素流失的风险程度呈现东部高,西部低和沿着河流呈条带状分布的特征,这种分布特征在一定程度上说明了导致顺义区土壤磷流失的主要原因是农业投入,顺义区土壤磷素流失风险程度以低为主,但中等风险的面积占总面积的30.05%,今后应加强研究区磷素管理,防止土壤磷流失。基于数字土壤系统的简化磷指数法能够很好地反映待评估区域磷素风险程度,为县域磷素风险评估提供了参考价值。
The county is a basic administrative unit in China. It explores a simplified method for assessing the risk of soil phosphorus loss at the county scale, aiming to provide guidance for the assessment of phosphorus risk and production practices in the county. Taking full account of the characteristics of county scale, this paper simplifies the index and evaluation process of P index assessment method. Taking Shunyi District of Beijing as an example, based on the digital soil system, using GIS and earthenological techniques, Law to assess the risk of phosphorus loss in Shunyi District. The results showed that the risk of phosphorus loss in the soil of Shunyi District was characterized by high in the east, low in the west and strip-like distribution along the river. The distribution characteristics of the phosphorus showed that the main reason for the phosphorus loss in the soil of Shunyi was In agriculture, the risk of phosphorus loss in the soil in Shunyi District is low, but the medium-risk area accounts for 30.05% of the total area. In the future, the phosphorus management in the research area should be strengthened to prevent the loss of soil phosphorus. The simplified P index method based on digital soil system can well reflect the degree of phosphorus risk in the area to be evaluated, which provides a reference value for phosphorus risk assessment in the county.