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当前位置: 首页 > 文章 > 巢湖流域农田土壤磷吸持指数及吸持饱和度特征 农业环境科学学报 2007,26 (S2) 386-389
Position: Home > Articles > Phosphorus Sorption and Saturation in Topsoil of Chaohu Lake Watershed Journal of Agro-Environment Science 2007,26 (S2) 386-389

巢湖流域农田土壤磷吸持指数及吸持饱和度特征

作  者：
周慧平;高超;王登峰;赵和苍;张桃林
单  位：
中国科学院南京土壤研究所;安徽省地质调查院;南京大学地理与海洋科学学院;南京大学国际地球系统科学研究所
关键词：
磷;吸持指数;吸持饱和度;巢湖流域
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。
译  名：
Phosphorus Sorption and Saturation in Topsoil of Chaohu Lake Watershed
作  者：
ZHOU Hui-Ping1,5,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;5.Taihu Basin Authority of the Ministry of Water Resources,Shanghai 200434,China)
关键词：
phosphorus;sorption index;sorption saturation;Chaohu watershed
摘  要：
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.

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