红枫湖水库底泥的氮磷蓄积量及分布特征

通过对红枫湖水库底泥分布及底泥厚度的调查,估算了建库48年来底泥的蓄积量,并探讨了水库底泥中营养盐的空间分布特征。结果表明,该水库蓄积的底泥总体积约为1 182×104m3,湿重约为1 429×104t,干重为550×104t;底泥中淤积的总氮、总磷的含量分别为31 333、8 528 t。总氮、总磷的水平分布既与其所处的地理环境有关,又反映了湖流作用、入湖河道位置的特点;总氮、总磷含量的垂直分布由底层向悬浮层呈明显的递增趋势,这种垂直变化反映了近年来红枫湖周边地区工业、农业与城市发展对水库水环境的影响。

Nitrogen and Phosphorus Deposition and Distribution Characteristics of Sediment in Hongfeng Lake Reservoir

By investigating the sediment distribution and thickness in Hongfeng Lake Reservoir,sediment deposition in the 48 years were estimated.And the spatial distribution of nutrients in the reservoir sediment was discussed.Result showed that the total volume of sediment was about 1 182×104 m3,the total wet weight was about 1 429×104 tons and the total dry weight was about 550×104 tons.The total nitrogen(TN) and total phosphorus(TP) in the sediment were 31 333 and 8 528 tons,respectively.The contents of TN and TP reflected the geographical condition as well as the function of lake and the position characteristics of the stream entering lake.The contents of TN and TP in the sediment increased vertically from bottom to surface and the increasing trend showed the deterioration of water quality in the river and the reservoir,corresponding to the development of industry,agriculture and city.