【摘要】 <正> 磷和铁都是生物不可缺少的元素。磷为海洋生物的基本营养元素之一,其含量的多寡对海洋生产力有重大影响;铁在海中形成的氢氧化铁胶体,对许多元素有吸附作用。因此,对沉积物中的磷和铁的研究具有生产价值与科学意义。厦门以南福建近岸海域位于117°08′—118°11′E,23°20′—24°20′N之间,大致呈NE—SW向条带状的分布,与海岸线方向基本一致,属南亚热带浅海区,平均水深大约20m。区内布设14条断面,共104个采样站。表层沉积物样品于1963年3—4月间用大洋50型采泥器获取。样品密封后运回室内分析。磷用钼蓝比色法测定,铁用重铬酸钾容量法测定.更多还原

【Abstract】 Low concentrations of P₂O₅ and Fe₂O₃ in the surficial sediments off South Fujian offshore waters （averagely 0.048% and 3.59%）, which is lower than those in deep sea sediments, is mainly attributable to coarser sediment particles as sandy sediments covered 82.5% of the surface of the studied area.Features in the geographic distribution of these elements are as follows: （1） all their isopleths are nearly parallel to coastal line; （2） their concentrations gradually increased seaward in the part of the offshore area north of Lishi Island Chain, whereas there is a reverse circumstance in the part south of Lishi Island Chain; and （3） their concentrations are relatively high in coastal bays.Linear regression analysis shows that Fe₂O₃ is positively correlated to organic matter, and sediment fraction with grain size less than 0.063mm,φ₅₀.Correlation coefficiants of Fe₂O₃ with the others decrease in the following order: organic matter>sediment fraction with grain size less than 0.063mm>φ₅₀.Similar correlation also exists between P₂O₅ and organic matter, and sediment fraction with grain size less than 0.063mm, φ₅₀, Fe₂O₃. Correlation coefficiants between P₂O₅ and the others decrease in the following order: organic matter>Fe₂O₃>sediment fraction with grain size less than 0.063 mm>φ₅₀.These correlations indicate that organic matter is the major factor influencing the concentrations of P₂O₅ and Fe₂O₃ in the surficial sediments in the area.更多还原