Assessing field vulnerability to phosphorus loss in Beijing agricultural area using Revised Field Phosphorus Ranking Scheme.
Assessing field vulnerability to phosphorus loss in Beijing agricultural area using Revised Field Phosphorus Ranking Scheme.
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DOI：
10.1016/s1001-0742(07)60160-0
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发表时间：
2007
影响因子：
6.9
通讯作者：
Qi Li;Li-ding Chen;Xin Qi;Xinyu Zhang;Yan-lin Ma;B. Fu
中科院分区：
文献类型：
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作者：
Qi Li;Li-ding Chen;Xin Qi;Xinyu Zhang;Yan-lin Ma;B. Fu
作为北京市饮用水源之一的官厅水库存在水体富营养化问题。主要由贵水供应。因此，研究贵水河流域磷流失的原因，完善流域磷管理策略，对该地区饮用水安全具有重要意义。本研究以改良的田间磷排序方案（PRS）为基础，在田间尺度上反映田间磷流失的脆弱性。该方案包括6个因素，并赋予每个因素的相对权重和确定方法。将影响因子分为运输因子和源因子，并采用中国地表水环境质量标准和土壤侵蚀分级与退化标准。根据新方案，将桂水河流域的34个地块划分为“低”、“中”、“高”3个磷流失潜力区。结果表明，果园和菜地的磷流失风险高于玉米和大豆地。源因子是影响研究区磷流失的主要因素。在研究区，控制磷的投入和提高磷的利用效率是减少磷损失的关键。综上所述，蔬菜田和果园田磷利用率极高，土壤试磷量也较高，与田间测磷量相比，修订后的田间PRS更能反映田间特征，识别磷流失关键源区的潜力也比PRS更大。
Guanting Reservoir, one of the drinking water supply sources of Beijing, suffers from water eutrophication. It is mainly supplied by Guishui River. Thus, to investigate the reasons of phosphorus (P) loss and improve the P management strategies in Guishui River watershed are important for the safety of drinking water in this region. In this study, a Revised Field P Ranking Scheme (PRS) was developed to reflect the field vulnerability of P loss at the field scale based on the Field PRS. In this new scheme, six factors are included, and each one was assigned a relative weight and a determination method. The affecting factors were classified into transport factors and source factors, and, the standards of environmental quality on surface water and soil erosion classification and degradation of the China were used in this scheme. By the new scheme, thirty-four fields in the Guishui River were categorized as “low”, “medium” or “high” potential for P loss into the runoff. The results showed that the P loss risks of orchard and vegetable fields were higher than that of corn and soybean fields. The source factors were the main factors to affect P loss from the study area. In the study area, controlling P input and improving P usage efficiency are critical to decrease P loss. Based on the results, it was suggested that more attention should be paid on the fields of vegetable and orchard since they have extremely high usage rate of P and high soil test of P. Compared with P surplus by field measurements, the Revised Field PRS was more suitable for reflecting the characteristics of fields, and had higher potential capacity to identify critical source areas of P loss than PRS.