Siegel D A, Doney S C, Yoder J A
Institute for Computational Earth System Science and Department of Geography, University of California Santa Barbara, Santa Barbara, CA 93106-3060, USA.
Science. 2002 Apr 26;296(5568):730-3. doi: 10.1126/science.1069174.
More than 50 years ago, Harald Sverdrup developed a simple model for the necessary conditions leading to the spring bloom of phytoplankton. Although this model has been used extensively across a variety of aquatic ecosystems, its application requires knowledge of community compensation irradiance (IC), the light level where photosynthetic and ecosystem community loss processes balance. However, reported IC values have varied by an order of magnitude. Here, IC estimates are determined using satellite and hydrographic data sets consistent with the assumptions in Sverdrup's 1953 critical depth hypothesis. Retrieved values of IC are approximately uniform throughout much of the North Atlantic with a mean value of 1.3 mol photons meter-2 day-1. These community-based IC determinations are roughly twice typical values found for phytoplankton alone indicating that phytoplankton account for approximately one-half of community ecosystem losses. This work also suggests that important aspects of heterotrophic community dynamics can be assessed using satellite observations.
50多年前，哈拉尔德·斯韦尔德鲁普开发了一个简单模型，用于描述导致浮游植物春季大量繁殖的必要条件。尽管该模型已在各种水生生态系统中广泛应用，但其应用需要了解群落补偿辐照度（IC），即光合作用与生态系统群落损失过程达到平衡时的光照水平。然而，报告的IC值相差一个数量级。在此，利用与斯韦尔德鲁普1953年临界深度假说中的假设一致的卫星和水文数据集来确定IC估计值。在北大西洋大部分地区，检索到的IC值大致均匀，平均值为1.3摩尔光子·米-2·天-1。这些基于群落的IC测定值大约是仅针对浮游植物的典型值的两倍，这表明浮游植物约占群落生态系统损失的一半。这项研究还表明，可以利用卫星观测来评估异养群落动态的重要方面。
