| 开封城市土壤磷素组成特征及流失风险 |
| 摘要点击 2299 全文点击 776 投稿时间：2017-07-10 修订日期：2017-10-21 |
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| 中文关键词 磷 组成特征 流失风险 城市土壤 开封 |
| 英文关键词 phosphorus characterization risk of loss urban soil Kaifeng City |
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| 中文摘要 |
| 为深入了解城市土壤磷素组成特征及其对受纳水体的影响，以开封城市表层土壤为研究对象，分析开封城市不同功能区土壤磷素的组成特征，并采用"突变点"法计算土壤磷素流失临界值，探讨开封城市不同功能区表层土壤磷素流失风险.结果表明，开封城市土壤总磷为400~1427 mg·kg-1，其中无机磷占65%~99%；速效磷（Olsen-P）和易解吸磷分别为3.41~115.03 mg·kg-1和0.01~9.40 mg·kg-1，与土壤磷素背景值相比，城市土壤磷素呈现明显集聚.开封城市土壤总磷和速效磷均呈现出东高西低，中心老城区高于新城区的空间分布格局；在不同功能区分布上，居民区土壤各形态磷素含量均最高.开封城市土壤磷素流失临界值对应的Olsen-P为22.18 mg·kg-1，超过临界值的土样占总土样数的33.64%，磷素流失风险最高的区域亦分布在中心老城区. |
| 英文摘要 |
| Characterization of phosphorus (P) and its risk of loss in urban soils in Kaifeng City, Henan Province were studied through field sampling and laboratory experiments. The spatial distribution of P and the map of risk of loss were obtained using geostatistical and spatial analysis techniques. The P content in urban soils ranged from 400 to 1427 mg·kg-1, the proportions of inorganic P in total P ranged from 65% to 99%, and Olsen-P and CaCl2-P in soils were 3.41-115.03 mg·kg-1 and 0.01-9.40 mg·kg-1, respectively. The composition of P was consistent in different urban areas and P concentrations were higher in residential areas. Spatial variations in P concentrations in soils were significant; the concentrations of P in eastern Kaifeng City were higher than those in western Kaifeng and the highest concentrations were detected in central Kaifeng. Olsen-P can be used as an indicator of the leaching risk of soil P. The critical value of leaching P from the soil was 22.18 mg·kg-1 and the concentration of Olsen-P in 33.64% of urban soil samples exceeded the critical value. The highest risk of P loss existed in central Kaifeng City. |
