中文摘要：

以九龙江北溪西陂库区为研究对象,分析了水库沉积物营养盐含量以及表层沉积物微藻的种类.结果表明,西陂库区沉积物中碳、磷营养盐负荷较高,TC含量为13770-18079μg·g^-1,TP含量为769-1697μg·g^-1,TN含量为720-1422μg·g^-1,氮营养盐负荷相对较低.沉积物中生物可利用性磷（BAP）含量占总磷的62.3%-67.3%,沉积物中磷一旦释放出来,对上覆水体有较大的贡献.西陂库区表层沉积物中的微藻总细胞丰度为2.90×105g^-1底泥干质量,主要以硅藻门、绿藻门为主,硅藻门约占81.8%-90.9%,绿藻门占6.1%-12.1%.甲藻孢囊占3.0%-6.1%,其中甲藻胞囊以拟多甲藻属为主,蓝藻等其他门类的藻类较少,沉积物中微藻为水华的发生提供了种源.

英文摘要：

We took Xipi reservoir of Jiulong River as the research object then analyzed the nu- trient contents and the microalgae species in surface sediment. The results showed that the content of carbon and phosphrous nutrients in sediments was relatively high, TC and TP ranged from 13 770 × 18 079 μg · g^-1, 769 - 1 697 μg · g^-1, respectively . However the content of nitrogen was relatively low, TN ranged from 720 - 1 422 μg ·g^-1 The content of bioavailability phosphorus （BAP） in sediments of Xipi reservoir accounted for 62.3% - 67.3% of the TP, which suggested that the contribution to the eutrophication might be great if phosphorus in the sediments were released. The abundance of microalgae in the sediments of Xipi reservior was 2.90 × 10^5 cells per gram of dry sediment, main species in sediments were Bacillariophyta and Chlorophyta. The proportion of Bacillariophyta ranged from 81.8% to 90. 9%, and Chlorophyta ranged from 6. 1% to 12. 1% . Otherwise, the dinoflagellates ranged from 3.0% to 6. 1%, the dominant specie of dinoflagellates was Peridini- opsis. Recovery of sediment microalgae provides provenance for algae blooms.