| 摘要: |
| 2001 年5 月-2002 年5 月在粤东大规模增养殖区柘林湾及湾外附近海域布设19 个测站, 对大量营养盐及相关的理化、生物因子进行每月一次的周年调查。结果表明, 调查海域大量营养盐的平面分布呈由湾内向湾外、近岸向离岸递减的基本格局, 而湾内则表现为西部高于东部的趋势。与外界水体的交换能力、周边地区的陆源排污及湾内海水增养殖业的结构是决定柘林湾营养盐平面分布格局的3 个主要因素。调查海域溶解性无机氮、磷、硅的年平均值分别为25.192、1.07 和37.61Lmol/ L, 与上一周年调查相比, 氮的含量略有上升, 而磷、硅的含量分别下降了45.1% 和37.0%。调查海区无机营养盐的周年变化基本上表现为单峰型。受
2001- 2002 年度厄尔尼诺现象的影响, 2002 年春季海区的地表径流明显减少, 盐度显著升高,由此造成了海区无机营养盐在这一期间的显著低值, 这应是海区磷、硅含量比上一周年显著下降的主要原因。浮游植物生长的限制因子从上一周年的氮限制转变成本周年的磷限制( 85.0% ) , 可能是厄尔尼诺现象引起磷含量显著下降的原因, 也可能是海区富氮趋势的表现。 |
| 关键词: 柘林湾, 营养盐, 时空分布 |
| DOI： |
| 分类号: |
| 基金项目:广东省重大科技兴海项目, A200005F02 号; 广东省自然科学基金资助项目, 021260 号; 国家教育部骨干教师资助计划项目, 2000( 23) 号 |
|
| THE TEMPORAL AND SPATIAL DISTRIBUTION OF THE NITROGEN, PHOSPHATE AND SILICATE IN ZHELIN BAY: 2001-2002 |
|
HUANG Chang- Jiang1,2,3, DU Hong1,2,3, CHEN Shan-Wen1,2,3, HE Xin1,2,3, DONG Qiao-Xiang1,2,3, HUANG Wen-Kui1,2,3
|
|
1.Marine Biology Lab, Shantou University;2.Aquaculture Research Station of Louisiana State University, US;3.Aquatic Bureau of Shantou city
|
| Abstract: |
| The temporal and spatial distributions of temperature, salinity and nutrients were investigated in Zhelin Bay in the Southeastern China Sea from May 2001 to May 2002. Water samples were collected, monthly, from nineteen stations. The results showed decreasing levels of dissolved inorganic nitrogen, phosphate and silicate from the interior to the outer sections of the bay, and from the nearshore to the offshore areas. The nutrients in the western area of the bay were higher than those in the eastern area. Such a distribution pattern was mainly caused by the water exchange capacity, sewage discharge from the land and mariculture in the bay. The annual variation of inorganic nutrient concentration in the investigated area displayed a mono-peak pattern. Compared to the results of previous investigation of the same area (May 2000-May 2001) , the concentration of nitrogen ( 25.92μmol/ L) increased, while phosphate ( 1.07μmol/L) dropped 4512% and silicate (37.61μmol/L) dropped 3710%. The decrease of phosphate and silicate was due to the reduction of river flux, which in turn resulted from the low precipitation in the spring of 2002 associated with the 2001-2002 El Niìo effect. This could be verified by the high salinity observed in Zhelin Bay during the invest igation. The present investigation also showed that the phosphorus ( 85.0%) rather than the nitrogen ( as in the previous investigation) was the limiting factor for phytoplankton growth in Zhelin Bay. This may be a result of the El Niìo effect or may be indicat ive of nitrogen enrichment in the area. |
| Key words: Zhelin Bay, Nutrients, Temporal and spatial distributions |
