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| Assessment of water environmental quality of maricultureareas in Liusha Bay in 2012-2013 |
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| Abstract: |
| Based on the quarterly investigation data from 2012 to 2013，the basic physical and chemical indexes
of water quality of mariculture areas in Liusha Bay were analyzed，and the water environmental quality was assessed
by the methods of organic pollution index（A），eutrophication index（E）and nutrient quality index（NQI）. The
results showed that the general concentration of inorganic phosphorus（DIP）was lower than 0.05 mg/L，while that of
inorganic nitrogen（DIN）was relatively high，especially in spring and summer（0.692-3.067 mg/L and 0.521-0.979
mg/L，respectively），indicating a phosphorus limitation in mariculture areas in Liusha Bay. Comparatively higher
concentration of COD was found in spring（4.62-5.81 mg/L）and summer（2.87-3.65 mg/L）. The concentration of
Chl-a of inner harbor was at the range of 4.85-8.79 μg/L in summer and autumn，indicating a moderate eutrophication
of water body. With a concentration of Chl-a exceed 10 μg/L in summer，station 1 and station 3 of outer harbor presented
obvious eutrophication. Serious eutrophication state was characterized by higher values of E（more than 1 from summer
to winter）and NQI（surpass 3 every quarter）. Serious in spring and summer（value of A exceed 4），the organic
pollution was improved in autumn and winter（value of A lower than 4）. In contrast with previous data，sharp increased
concentration of DIN and heavier eutrophication were witnessed. |
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