PHOSPHORUS LIMITATION OF PRIMARY PRODUCTIVITY IN THE EASTERN MEDITERRANEAN-SEA
PHOSPHORUS LIMITATION OF PRIMARY PRODUCTIVITY IN THE EASTERN MEDITERRANEAN-SEA
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DOI：
10.4319/lo.1991.36.3.0424
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发表时间：
1991-05-01
影响因子：
4.5
通讯作者：
GORDON, LI
中科院分区：
文献类型：
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作者：
KROM, MD;KRESS, N;GORDON, LI
虽然人们普遍认为NO3-限制了世界上大多数海洋的初级生产力，但以前的研究表明地中海可能是个例外。本研究发现，在地中海东南部暖核涡旋的核心和边界，冬季浮游植物大量繁殖期间，上层水柱中的PO4（3-）全部被去除，而可测量的（0.3-0.6 mu- m） NO3-仍然存在。塞浦路斯涡旋核心和边界的N:P （NO3-:PO43-）比值为27.4，N / P散点图线性部分斜率为25.5，NO3-轴正截距为0.5 mu- m。黎凡特盆地南部大部分地区的水柱具有相似的N:P比值（28-29）、坡度（21-23）和截距（0.9-1.1）。这些数据，连同孵化实验的结果，使我们得出结论，地中海东南部的P非常有限。整个盆地的磷限制程度由西向东递增。我们认为富铁粉尘颗粒吸附去除PO43-可能是控制水柱中磷浓度的重要过程。
Although NO3- is generally considered to limit primary productivity in most of the world's oceans, previous studies have suggested the Mediterranean Sea may be an exception. In this study of the southeastern Mediterranean, we found that all the PO4(3-) was removed from the upper water column during the winter phytoplankton bloom in the core and boundary of a warm-core eddy, while measurable (0.3-0.6-mu-M) NO3- remained. The N:P (NO3-:PO43-) ratio in the core and boundary of the Cyprus eddy was 27.4 and the slope of the linear portion of the N vs. P scattergram was 25.5 with a positive intercept of 0.5-mu-M on the NO3- axis. A similar N:P ratio (28-29), slope (21-23), and intercept (0.9-1.1) was found for the water column across much of the southern Levantine basin. These data, taken together with the results of incubation experiments, lead us to conclude that the southeastern Mediterranean is strongly P limited. The degree of P limitation increases from west to east across the entire basin. We suggest that removal of PO43- by adsorbtion on Fe- rich dust particles may be an important process controlling the concentration of P in the water column.