武汉东湖不同湖区底泥总磷含量及变化的研究
THE CONCENTRATION AND DYNAMICS OF SEDIMENT PHOSPHORUS IN VARIOUS LAKE REGIONS OF LAKE DONGHU
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摘要: 以武汉东湖为对象,研究了1998.03-1999.02期间不同营养水平湖区底泥中(0-5cm,5-10cm)总磷的含量及季节动态.6个站平均总磷含量为1.15mg/g,同80年代初相比,Ⅰ、Ⅱ站底泥中总磷含量分别增高1.42倍和1.03倍.受污水排放影响较重的0站磷含量高达2.78mg/g,而受污水排放影响较小的Ⅳ、Ⅴ站仅分别为0.52mg/g和0.50mg/g.东湖底泥中磷年平均含量与湖水中磷年平均浓度相关系数极高(r=0.997,n=5,p0.02).通过对不同湖泊的底泥磷含量、水柱磷含量和外源负荷的比较和相关分析可以看出,水柱中磷含量较高,磷负荷较大的湖泊底泥中磷含量也高.可以预测,即使东湖的外源负荷得以控制,巨大的底泥磷内源负荷将会继续对东湖水质构成威胁.Abstract: The concentration and seasonal dynamics of phosphorus in the sediment(0—5cm,5—10cm)of Lake Donghu were studied at six stations with different nutrient levels. The sampling was taken by a core sampler monthly from March 1998 to February 1999. On the annual average of the six stations,P content in the sediment was 1.15mg/g. The P content in the sediment at Station Ⅰ(Ⅱ)in the present study was 1.42(1.03)times that in the early 1980s. At Station 0 where there was heavy sewerage discharge,the sediment P content was as high as 2.78mg/g,while at the less affected Stations Ⅳ and Ⅴ,it was only 0.52mg/g and 0.50mg/g,respectively. There was a good relationship between the P content of the sediment and the P content of the lake water(r=0.997,n=5,p0.02). By comparing the P content of the sediment and water column,and external P loading in some Chinese lakes,it appears that if the P content of the water column is high and external P loading is large,the P content in the sediment is generally also high. Predictably,the great P pool in the sediment will still be a threat to the water quality of the lake ecosystem even if the external loading is under control.
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Keywords:
- Lake Donghu /
- P content in the sediment /
- Eutrophication /
- P loading
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