知识与财富的链接
研究渤海的可持续发展.根据 1979～1999 年渤海中部断面温度、盐度、溶解氧、营养盐的调查资料,分析了它们的分布结构和20年来的变化趋势.结果显示断面各个要素冬季的垂向分布均匀,夏季有2个冷水中心,盐度、溶解氧、营养盐在冷中心位置也出现了类似的高值或者低值中心.各要素的距平图显示盐度有上升趋势,溶解氧含量下降,无机氮逐年增加,磷酸盐和硅酸盐夏季有下降的趋势,但是冬季没有明显的增加或者减少的趋势.
Based on the survey data from 1979 to 1999 in the central section of the Bohai Sea, this paper analyses the distribution of temperature, salinity, dissolved oxygen and nutrients as well as their variation trends duringthese 20 years. The results show that all factors in the section are vertically uniform in winter, while in summer there are two cold-water centers, and there are also similar high or low centers of salinity, dissolved oxygen, and nutrients in the cold centers. The anomaly pictures of the factors reveal positive trendsof temperature, salinity and inorganic nitrogen. But phosphate and silicate decrease in summer, although they do not show obvious positive or negative trends in winter.