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。
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.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2007年第B10期386-389,共4页
Journal of Agro-Environment Science
基金
中国科学院知识创新工程重要方向资助项目(KZCX3-SW-417)
中国地质大调查项目
关键词
磷
吸持指数
吸持饱和度
巢湖流域
phosphorus
sorption index
sorption saturation
Cbaohu watershed
