在西亚北极太平洋的一个中度铁丰富会导致一个大型的中心性藻花
Atsushi Tsuda1, Shigenobu Takeda, Hiroaki Saito
1Hokkaido National Research Institute, Kushiro, Hokkaido 085-0802, Japan.
Science (New York, N.Y.)
|May 10, 2003
概括
北太平洋的铁添加促进了植物浮游生物的生长和生物质. 这项研究表明,铁的可用性控制了植物浮游生物种及其对海洋生物地质化学的影响.
科学领域:
- 海洋生物学 海洋生物学
- 海洋学 海洋学 海洋学
- 生物地质化学生物地质化学
背景情况:
- 北太平洋的亚北极水域的特点是高酸盐和低叶绿素,这表明营养限制.
- 铁是植物浮游生物的关键微量营养素,其稀缺性可能会限制某些海洋地区的初级生产.
研究的目的:
- 测试铁限制假设在亚北极北太平洋的现场.
- 研究铁丰富对植物浮游生物现存量,物种组成和生物地化学循环的影响.
主要方法:
- 进行了现场铁缩实验.
- 在添加铁之前和之后,监测了浮游生物的现存量,宏观营养素度和溶解的二氧化碳水平.
主要成果:
- 一次铁缩导致了植物浮游生物质的显著增加.
- 铁添加后,宏观营养素和溶解的二氧化碳度下降.
- 占主导地位的植物浮游生物种从状藻转移到中心藻Chaetoceros debilis,呈现出每天2.6倍的高增长率.
结论:
- 铁的生物可用性是调节高酸盐,低叶绿素水中的浮游植物生物质量大小的关键因素.
- 在铁供应后占主导地位的植物浮游生物种影响这些水域的生物地化学反应.
- 铁的可用性不仅决定了植物浮游生物的数量,也决定了植物浮游生物的类型,影响了海洋碳循环.
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