PRIMARY PELAGIC PRODUCTION OF THE ETANG-DE-BERRE IN 1977-1978 - COMPARISON WITH THE MARINE-ENVIRONMENT (NORTHWEST MEDITERRANEAN)
PRIMARY PELAGIC PRODUCTION OF THE ETANG-DE-BERRE IN 1977-1978 - COMPARISON WITH THE MARINE-ENVIRONMENT (NORTHWEST MEDITERRANEAN)
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DOI：
10.1007/bf00392258
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发表时间：
1983-01-01
期刊：
影响因子：
2.4
通讯作者：
KIM, KT
中科院分区：
文献类型：
--
作者：
KIM, KT
初步生产和光合效率的测量是在靠近马赛（法国）的微咸湖泊Etang de Berre进行的，该湖泊被杜朗斯河稀释，大约在Carry-le-Rouet（地中海）地区进行。离罗纳河出口25公里。从1977年12月到1978年11月，在Etang de Berre进行了初步产量（14C）估计。C吸收量在38 ~ 1091 mg C m-3 d-1 [day-1]之间，平均表面积为256 mg；水柱吸收C的速率在240 ~ 2310 mg C- m-2 d-1之间，平均为810 mg C- m-2 d-1，代表290 g C- m-2/年和全湖光合作用C的45000吨/年。用Ryther法测定了2年的总光合产量。从海水（Carry-le-Rouet）中获得的值范围为23-2337 mg C m-2 d-1，加权平均值为319，约为0.1%。咸淡水（Etang de Berre）的值在14-1778 mg C - m-2 d-1之间，加权平均值为682，代表整个湖的250 g C - m-2/年和38,400吨/年的光合作用C。两种初级生产测量方法得出的值大致相似。净产量（由Utermohl方法估算的生物量计算）与总光合产量进行比较。海水的净产量没有显著变化：大多数值通常接近于零。在整个2年期间，微咸水中的净产量与总光合产量的浓度相比表现出许多明显的变化。总产量和净产量估计值之间的巨大差异可能是由于放牧造成的，放牧在Etang de Berre很高，但在海水中较慢且更稳定。研究了叶绿素a的初级产量和总光合产量与生物量的比值。在Etang de Berre，前者的比值在0.57 - 3.75之间，平均为1.44；这与之前报告的值类似。Etang de Berre的总产量与生物量之比在0.3到4.2之间变化，平均为1.27，也证实了之前的数据。海水计算的非常高的数值可能是由于低估了生物量。
Measurements of primary production and photosynthetic efficiency were carried out in the brackish lake, Etang de Berre, near Marseilles (France), which is diluted by the Durance River, and in the area of Carry-le-Rouet (Mediterranean Sea) .apprx. 25 km off the Rhone River outlet. Primary production (14C) estimations were made in Etang de Berre from Dec. 1977 to Nov. 1978. The C uptake ranged between 38 and 1091 mg C m-3 d-1 [day-1], with an average surface value of 256 mg; water-column C-uptake rates ranged between 240 and 2310 mg C m-2 d-1, with an average of 810, representing 290 g C m-2/yr and 45,000 tons/yr of photosynthetized C for the whole lake. Gross photosynthetic production measured by the method of Ryther was studied over a 2 yr period. The values obtained from marine water (Carry-le-Rouet) ranged from 23-2337 mg C m-2 d-1, with a weighted average of 319, representing .apprx. 110 g C m-2 per yr. The values in brackish water (Etang de Berre) ranged from 14-1778 mg C m-2 d-1, with a weighted average of 682, representing 250 g C m-2/yr and 38,400 tons/yr of photosynthesized C for the whole lake. The values derived from both methods of primary production measurements are approximately similar. Net production (computed from biomass estimations by Utermohl''s method) was compared with gross photosynthetic production. The net production in marine water did not display significant variations: most values were usually near zero. Net production in brackish water exhibited a number of clear variations compared with concentrations of gross photosynthetic production during the whole 2 yr period. This large difference between estimations of gross and net production may be due to grazing, which is high in Etang de Berre, but slower and more constant in seawater. The ratios of primary production:chlorophyll a and gross photosynthetic production:biomass were also studied. In Etang de Berre, the former ratio ranges between 0.57 and 3.75, with an average of 1.44; this is similar to previously reported values. The ratio gross production:biomass in Etang de Berre varies between 0.3 and 4.2, with an average of 1.27, also confirming previous data. The very high values calculated for marine waters may result from an under-estimation of biomass.