Change trend of the chemical items in Qinzhou Bay in the last twenty years I Nutrient condition in usual discharged period
Change trend of the chemical items in Qinzhou Bay in the last twenty years I Nutrient condition in usual discharged period
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发表时间：
2002
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通讯作者：
W. Man
中科院分区：
文献类型：
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作者：
W. Man
Based on the systemic investigation in the usual dischanged period of 1983, 1998 and 1999, the nutrient condition and the relation with the environmental factors in Qinzhou Bay were studied. The results showed that the contents of the nutrient salt were changed obviously. The inorganic nitrogen contents were increased during the years evidently, and the inorganic phosphorus contents turned out contrary to it. And the lowest value of active Si appeared while the quantity of the phytoplankton reached the highest in 1990. The correlation analysis showed that the major factors effecting the change of the N, P and Si contents in this bay were the quantity input from land and the abundance of phytoplankton. The Si∶N∶P ratio analysis turned out the succession rule which changed from obvious N-limitation to P-limitation. And the Si-limitation appeared only while the phytoplankton was extremely abundant. Through calculation by the comprehensive index for the nutrient condition, it turnes out that the waters in this bay have be changed from low to middle and to rich nutrient condition.
