王小冬，程果锋，田昌凤，吴宗凡，徐 皓，刘兴国，时 旭，徐国昌
（农业部渔业装备与工程技术重点实验室，中国水产科学研究院渔业机械仪器研究所，上海 200092）

摘要：为了开发新型增氧方式，研究了浮游植物光合作用的产氧能力，比较了不同浮游植物浓度下水体的溶氧恢复能力。试验在晴朗天气的温室中进行，选用5个水槽（1#～5#）对应5个浮游植物浓度梯度，由低到高依次为5.68×107、1.48×108、1.96×108、1.16×109和1.40×109 cells/L，种类主要是绿藻门的栅藻属。先利用亚硫酸钠和氯化钴在中午12:00时对各水槽溶氧降至1.0 mg/L左右，然后依靠浮游植物光合作用恢复溶氧，测定结果是，1#～5#水槽的平均溶氧恢复速率依次为：0.02、0.33、0.34、1.54和1.19 mg/(L•h)，转化为24 h即1 d的速率依次为0.48、7.92、8.16、36.96和28.56 mg/(L•d)。与已报道的文献比较可知，除1#外，其他4个水槽中浮游植物光合作用形成的溶氧恢复效果能达到机械增氧效果。试验结果表明，浮游植物光合作用能够产生丰富的溶氧，利用池塘浮游植物的产氧对池塘进行溶氧恢复是可行性，并依此提出了一种新型增氧方式思路。

关键词：浮游植物；栅藻属；光合作用；溶氧恢复；水产养殖

Comparison of recovery capability of dissolved oxygen in water with various phytoplankton densities
WANG Xiaodong，CHEN Guofeng，TIAN Changfeng，WU Zongfan,
XU Hao，LIU Xingguo，SHI Xu，XU Guochang
(Key Laboratory of Fishery Equipment and Engineering, Ministry of Agriculture, Fishery Machinery and Instrument Research Institute, Chinese Academy of Fisheries Sciences, Shanghai 200092, China)

Abstract: The oxygen production from photosynthesis of phytoplankton was studied for developing new oxygenation ways, and an experiment was carried out in greenhouse in a sunny day, which compared the recovery capability of dissolved oxygen (DO) of water with different phytoplankton concentrations. It included 5 levels of phytoplankton density in plastic tanks, which were named tank 1#, 2#, 3#, 4# and 5#, with density of 5.68×107, 1.48×108, 1.96×108, 1.16×109 and 1.40×109 cells/L, respectively. The phytoplankton composition of each tank was similar, which was mainly Scenedesmus of Chlorophyta. The DO of the experiment water was initially eliminated to nearly 1 mg/L at 12:00 by sodium sulfite and cobalt dichloride, and then the DO was recovered by photosynthesis. The results was that the average recovery rate of DO in tank 1#, 2#, 3#, 4# and 5# was 0.02, 0.33, 0.34, 1.54 and 1.19 mg/(L•h), respectively, which equaled to 0.48, 7.92, 8.16, 36.96 and 28.56 mg/(L•d), respectively. The recovery capability of DO in tank 2#, 3#, 4# and 5# by photosynthesis satisfied reported aeration result. This experiment showed, photosynthesis by phytoplankton can produce oxygen abundantly, and it was theoretically feasible to utilize the algal photosynthesis for DO recovery of aquaculture ponds. And a new way of oxygenation was put forward.

Key words: phytoplankton; Scenedesmus ; photosynthesis; recovery of dissolved oxygen; aquaculture

（来源：《渔业现代化》2013,40(4):13-17）