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| Analysis on the Correlation Between Total Phosphorus, Water Temperature, Mineralization and Chlorophyll-a in Qinghai Lake, China |
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| KeyWord:Qinghai Lake; chlorophyll-a; total phosphorus; water temperature; mineralization |
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| Abstract: |
| The aim of present study was to explore the approches for assessing the effects of total phosphorus, water temperature and mineralization on alga growth in Qinghai Lake on basis of data analysis by 11 vertical sampling lines. In meanwhile, the chlorophyll-a contents and related distributions were detected, and relevant correlations were determined. The results showed that the chlorophyll-a contents were ranged from 0.396 mg·L-1 to 4.031 mg·L-1 with the mean value of 1.387 mg·L-1 in May, from 0.129 mg·L-1 to 0.865 mg·L-1 with the mean value of 0.432 mg·L-1 in July, and ranged from 0.164 mg·L-1 to 1.360 mg·L-1 with the mean value of 0.665 mg·L-1 in September. The average contents of total phosphorus continuously declined from 0.124 mg·L-1 in May to 0.061 mg·L-1 in September, as a result, the demand of total phosphorus for alga growth was greater than exogenous input and endogenous transformation. Therefore phosphorus, as one of crucial limiting nutrients for alga growth and reproduction in Qinghai Lake, but the water temperature was the main factor to limit alga growth in the period of spring time. At present, degree of mineralization in Qinghai Lake is right at a appropriate range for alga growth. |
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