PHYTOPLANKTON PRODUCTION IN SHALLOW EUTROPHIC LAKE MYVATN, ICELAND
PHYTOPLANKTON PRODUCTION IN SHALLOW EUTROPHIC LAKE MYVATN, ICELAND
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DOI：
10.2307/3544223
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发表时间：
1979-01-01
期刊：
影响因子：
3.4
通讯作者：
ADALSTEINSSON, H
中科院分区：
文献类型：
--
作者：
JONASSON, PM;ADALSTEINSSON, H
Myvatn湖[冰岛]有3个不规则的盆地，产量不同。该湖位于北纬65 ° 35“，海拔278米。北池的滞留时间为14天，南池为24天。辐射为79千卡米-2年-1。温度振幅为18 ℃。C yr-1和3.degree. C d-1。平均冰盖为190天yr-1。再悬浮率高，且随深度而变化，盆地北部的再悬浮率是南部的3倍。养分输入分别为1.4，1.5和340克m-2年-1的N，P和Si。在出口处，N：P比为8：1。磷的有效性似乎限制了浮游植物的生产。春季和秋季浮游植物演替为硅藻类，初夏和秋季为金藻类，夏季为水华鱼腥藻。相对较低的叶绿素a含量在鱼腥藻水华期间最高。在所有季节测量昼夜生产。高产量，由于鱼腥藻，符合高辐射，高温和破冰时间。南部盆地1971-1976年的峰值相似。尽管生物量相当大，但在其他季节产量很低。讨论了叶绿素a与浮游植物生物量、生产量和周转时间之间的相互关系。
Lake Myvatn [Iceland] has 3 irregular basins with different production. The lake is at latitude 65.degree.35''N and at 278 m above sea level. Retention time for the north-basin was 14 d[days], and the south-basin 24 d. Radiation was 79 kcal m-2 yr-1. The temperature amplitude was 18.degree. C yr-1 and 3.degree. C d-1. Average ice-cover was 190 d yr-1. Resuspension is high and varies with depth, and it was 3 times higher in the north than the south basin. Nutrient input was 1.4, 1.5 and 340 g m-2 yr-1 for N, P and Si, respectively. At the outlet the N:P ratio was 8:1. Availability of P seems to limit the phytoplankton production. The phytoplankton succession was: diatoms in spring and autumn, chrysophyceans in early summer and autumn, Anabaena flos-aquae in summer. The relatively low chlorophyll a content was highest during the Anabaena bloom. Diel production was measured at all seasons. High production, due to Anabaena, coincided with high radiation, high temperature and time of ice break. Peak values were similar all years (1971-1976) in south basin. Production was low at other seasons despite considerable biomass. The interrelationship between chlorophyll a, biomass, production and turnover time of phytoplankton is discussed.