乌鲁木齐城市表层土壤中磷的空间分布及赋存形态

研究表明,乌鲁木齐市城市表层土壤具有明显的富磷特征,空间分布差异性大。各形态磷含量特征为:钙结合态磷>闭蓄还原态磷>有机磷>铁铝结合态磷>可交换态磷。商业区人类活动频繁,人口流动密度大,污染物来源众多,富磷特征尤为明显,总磷、各形态磷、水溶磷含量都较高;工业区的可交换态磷、铁铝结合态磷含量较高;交通密集区的钙磷、有机磷含量较高。乌鲁木齐市表层土壤水溶磷含量远高于上海、南京等湿润区城市。

Spatial Distribution and States of Phosphorus in Urban Topsoil in Urumqi

In this paper,the spatial distribution and states of phosphorus in urban topsoil in Urumqi are lucubrated.The results show that the content of total P in urban topsoil in Urumqi is high,and its spatial distribution is significantly different from different functional zones.Such situation is closely related to land use in urban expansion,drainage of waste water and other wastes containing phosphorus.The content of phosphorus with different states is in an order of Ca-P > Re-P > Org-P >(Fe Al)-P > Exch-P.The intensity of human activities and the population density in the commercial zone are significantly high,and there are a lot of pollution sources,thus the contents of total P,P with various states and water-dissolvable P are all higher than that in other functional zones.The contents of Exch-P and(Fe Al)-P in the industrial zone are high,and the contents of Ca-P and Org-P in the functional zones with busy traffic are also high.The content of water-dissolvable P in urban topsoil in Urumqi is much higher than that in Shanghai,Nanjing,etc.where the humidity is high.There is a significant correlation between the content of total P and the contents of P with various states,such as Ca-P,Re-P,Org-P,(Fe Al)-P and Exch-P as well as water-dissolvable P.