【作者】 周慧平； 高超； 王登峰； 赵和苍； 张桃林；

【Author】 ZHOU Hui-Ping1,2, GAO Chao2, WANG Deng-feng2, ZHAO He-cang3, ZHANG Tao-lin4 (1.International institute for earth system science, Nanjing University, Nanjing 210093, China; 2. Department of Geography and Oceanography Science, Nanjing University, Nanjing 210093, China; 3. Institute of Geological Survey of Anhui Province, Hefei 230022, China; 4. Institute of Soil Science, Chinese Academy of Science, Nanjing 210000, China;)

【机构】 南京大学国际地球系统科学研究所； 南京大学地理与海洋科学学院； 安徽省地质调查院； 中国科学院南京土壤研究所；

【摘要】 农业活动对水体磷污染的影响已成为公众关注的焦点。土壤对磷具有一定的固定能力,可以采用土壤磷吸持指数(PSI)和吸持饱和度(DPSS)来表征土壤中的磷向水体释放的风险。对巢湖流域各类土壤的研究表明,土壤的固磷能力相比太湖及国外其他地区普遍较低,红壤和石灰岩土的固磷能力相对较强,而紫色土的固磷能力最弱。土壤磷的吸持饱和度和吸持指数之间存在显著的负相关关系,吸持指数较高的红壤和石灰岩土,其土壤磷吸持饱和度表现较低;而紫色土对磷较容易饱和,磷吸持饱和度普遍偏高。已有30%的土壤其磷吸持饱和度超过25%的流失临界值,应重视其可能对环境造成的影响。更多还原

【Abstract】 The impact of agricultural activities on phosphorus(P)water pollution continues to be a serious public concern. Because of the high P fixation capacity of soils, vertical movement of P through the soil profile is generally considered of little importance, unless soils become P saturated. The P sorption index(PSI)and the degree of P sorption saturation(DPSS)have been suggested as indicators for the risk of P loss from agricultural soils. In this paper, the P sorption and saturation in topsoil of Chaohu Lake Watershed were tested and the results showed that the P fixation capacity in Chaohu area was generally lower than Taihu and areas in other literatures. The red soil and calcareous soil had a higher P fixation capacity while the purple soil had the lowest capacity. A negative correlation was found between PSI and DPSS for all soils. The P saturation in red soil and calcareous soil were relative lower than purple soil. Over 30% of the sampling soils were P saturated with the DPSS overpass 25%, which is the threshold of P loss from agricultural soils. It indicated that more attentions should be paid to this area for the water pollution derived from P loss.更多还原