32°N断面二十年来生态环境的演化及变化趋势
Distribution and variation trends of the environmental factors in the 32°N section
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摘要: 通过分析20a来(1975—1998年)32°N断面春、秋两个季节的生态环境参数,选取特定年份对该断面各环境要素断面分布特征做了探讨,并结合各环境参数的距平图及多年气候趋势系数,初步讨论了各环境参数春季和秋季多年来的变化趋势及营养盐结构变化状况:20a来各环境参数发生了显著变化,春季、秋季无机氮有上升趋势,溶解氧、磷酸盐和硅酸盐呈下降的趋势;氮可能成为春季东海北部海域浮游植物生长的限制因子。Abstract: Based on the survey data from 1975 to 1998 in the 32°N section,the distributions of temperature,salinity,dissolved oxygen and nutrients as well as their variation trends were analyzed during these 20 a.The climatet rend coefficients and the anomaly pictures of the factors revealed positive trends of nitrate.But dissolved oxygen,phosphate and silicate decreased in spring.The nutrient structure in spring was also discussed.The content of nitrogen was generally low and it was possible to be a limiting-factor for phytoplankton growth in the study area.
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Key words:
- environmental factors /
- long-term variation /
- 32° /
- N section
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