摘要
以珠海6座典型中小型供水水库为研究对象,通过对水库沉积物中磷形态和释放速率的测定,分析这些水库沉积物中磷形态特征和释放速率及它们与水体磷的关系,了解库容和调水对沉积物中磷形态特点和释放速率的影响。从库容来看,小型水库沉积物中TP及各形态磷含量明显高于中型水库,且小型水库以无机磷为主,中型水库以有机磷为主。小型水库表层底泥的磷释放速率明显高于中型水库。从调水方式来看,抽水水库沉积物中TP及各形态磷含量明显高于非抽水水库且自表层向下大多有递减的趋势,层间波动较大,说明调水入库河流污染日趋严重以及水库调水量增长,沉积物中磷的含量有增加趋势。6座水库沉积物中PO4-P的释放速率与上覆水体TP的增加量以及沉积物中NaOH-P+OP含量呈显著的相关性(r>0.80,p<0.05),说明底泥磷释放对水体中TP有很大贡献,而释放的PO4-P主要来源于沉积物中NaOH-P和OP。
Six middle or small-sized reservoirs for drinking water in Zhuhai city were investigated .to understand content, fraction, and release of phosphorus frol-n sediments. By measuring phosphorus fractions in sediments and phosphorus release rate, the distribution of phosphorus fractions and the relationship between the phosphorus forms and phosphorus concentrations in the water column were analyzed. The results show that reservoir volume and pumping water volume are the key elements influencing sediment phosphorus contents and release rate. The contents of TP, IP, OP, NaOH-P and HCI-P in sediments of small sized reservoirs are higher than in middle sized reservoirs. The main fractions are inorganic phosphorus in small sized reservoirs and organic phosphorus in middle sized reservoirs. The phosphorus release rate of surface sediments in small reservoirs is higher than in middle sized reservoirs. The contents of TP, IP, OP, NaOH-P and HCl-P in sediments of pumped storage reservoirs are higher than those in non-pumping reservoirs. The contents of phosphorus decreased vertically from the sediment surface to the bottom of the core. PO4-P release rate from the sediments and TP were closely related （r〉0.80, p〈0.05）, indicating that PO4-P release made a high contribution to TP in the water bodies.
出处
《生态环境》
CSCD
北大核心
2008年第3期903-908,共6页
Ecology and Environmnet
基金
广东省水利厅科技计划项目
珠海重大科技项目(PC20052040)
关键词
南亚热带
抽水型水库
沉积物
磷形态
磷释放
tropics
pumped storage reservoirs
sediment
phosphorus fractions
phosphorus release
