| 摘要: |
| 利用2006～2007年4个航次的大面调查数据, 分析讨论了广西近海4个季节营养盐的时空分布变化特征。结果表明, 该海域在春、夏、秋三季, 活性硅酸盐和溶解无机氮分布趋势是近岸高, 远岸低,由北向南呈梯度快速递减, 高值区主要出现在廉州湾、铁山港和茅尾海三个区域; 夏季磷酸盐在雷州半岛与涠洲岛之间出现高值; 冬季3类营养盐在调查海区内分布均匀且为一年最低值。对该海区营养盐结构分析表明, 硅在该海区过剩, 溶解无机氮基本能满足浮游植物的生长需要, 但在春季溶解无机氮和磷浓度都较低, 属于寡营养型; 夏季该海区磷浓度充足, 在秋冬两季磷为该海区的限制性元素。 |
| 关键词: 营养盐 时空分布 广西近海 |
| DOI： |
| 分类号: |
| 基金项目:广西908 专项项目(GX908-01-01) |
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| The distribution characteristics and seasonal variation of nutrients in Guangxi coastal area |
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XIN Ming,WANG Bao-dong,SUN Xia,XIE Lin-ping
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| Abstract: |
| Based on the data from four cruises of oceanographic survey in July and December, 2006 and April and October, 2007, we studied the distribution characteristics and seasonal variation of silicate, reactive phosphate and dissolved inorganic nitrogen (DIN) in Guangxi coastal area. We found that in spring, summer and autumn, SiO3 and DIN were high in the coastal area, low in the open sea, decreasing from north to south gradually. The high value occurred mainly in the regions of Lianzhou Bay, Maowei Sea and Tieshan port. The high concentration of PO4-P appeared between Leizhou Peninsula and Weizhou Island. In winter, three types of nutrients were of uniform distribution. There was always low value in the southwest area. Silicate was of the highest concentration, followed by dissolved inorganic nitrogen, and reactive phosphate was the least. In surface water, the negative correlation between three nutrient contents and pH indicated that the nutrient content were mainly affected by land-based factors; in winter, this correlation was not obvious. Compared to the conservative standards of nutrient limitation, silicate was excessive in this area, dissolved inorganic nitrogen could meet the growth needs of phytoplankton; in spring, concentrations of dissolved inorganic nitrogen and phosphorus were relatively low and the coastal area was oligotrophic; in summer, phosphorus content was adequate; and in autumn and winter, phosphorus content was the restrictive elements of the area. The data provided rich information for the study of biogenic elements and water quality in Guangxi coastal area. |
| Key words: nutrients temporal and spatial distribution Guangxi coastal area |
