通过营养应激诊断揭示了对热带太平洋生产力的控制
Michael J Behrenfeld1, Kirby Worthington, Robert M Sherrell
1Department of Botany and Plant Pathology, Cordley Hall 2082, Oregon State University, Corvallis, Oregon 97331-2902, USA. mjb@science.oregonstate.edu
Nature
|September 1, 2006
概括
铁的可用性限制了热带太平洋的植物浮游生物的生长,特别是在高酸盐低 (HNLC) 区域. 北方水域的和放牧控制生物量,影响海洋总体生产力的估计.
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:
- 铁是众所周知的高酸盐低 (HNLC) 地区植物浮游生物的限制营养素.
- 之前的现场缩实验规模有限,可能不反映自然种群动态.
研究的目的:
- 通过使用新的光技术,评估限制热带太平洋 phytoplankton 增长的因素.
- 建立植物浮游植物光和对营养压力的生理反应之间的关系.
- 在空前的空间尺度上评估植物浮游生物生长调节.
主要方法:
- 利用了12年的光测量来分析浮游植物生态生理学.
- 在热带太平洋地区划分了三个不同的生态生理系统.
- 相关的特定光特性归因于浮游植物对营养限制的生理反应.
主要成果:
- 确定铁是赤道和南部HNLC和寡质水域植物浮游生物生长的关键调节剂.
- 确定和动物浮游生物作为北热带太平洋水域生物质的主要调节者.
- 量化了一个潜在的低估热带太平洋的生产力为1.2-2.5 Pg C yr ((-1).
结论:
- 热带太平洋的浮游植物生长受到不同地区不同的因素的调节.
- 铁,和放牧相互作用,控制海洋的生产力.
- 修订的生产率估计对了解海洋碳循环和气候变化影响有重大影响.
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