| XIAO Jie,ZHANG Xiaohong,GAO Chunlei,JIANG Meijie,LI Ruixiang,WANG Zongling,LI Yan,FAN Shiliang. 2016. Effect of temperature, salinity and irradiance on growth and photosynthesis of Ulva prolifera. Acta Oceanologica Sinica, 35(10):114－121 |
| Effect of temperature, salinity and irradiance on growth and photosynthesis of Ulva prolifera |
| 温度、盐度和光照对浒苔生长和光合作用的影响 |
| Received:August 31, 2015 Revised:December 24, 2015 |
| DOI：10.1007/s13131-016-0891-0 |
| Key words:Ulva prolifera green tide photosynthesis growth rate temperature salinity |
| 中文关键词: 浒苔 绿潮 光合作用 生长率 温度 盐度 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | XIAO Jie | Key Laboratory of Science and Engineering for Marine Ecology and Environment, The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | | | ZHANG Xiaohong | Key Laboratory of Science and Engineering for Marine Ecology and Environment, The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
Qingdao Environmental Monitoring Station, Qingdao 266071, China | | | GAO Chunlei | Key Laboratory of Science and Engineering for Marine Ecology and Environment, The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | gaochunlei@fio.org.cn | | JIANG Meijie | Key Laboratory of Science and Engineering for Marine Ecology and Environment, The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | | | LI Ruixiang | Key Laboratory of Science and Engineering for Marine Ecology and Environment, The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | | | WANG Zongling | Key Laboratory of Science and Engineering for Marine Ecology and Environment, The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | | | LI Yan | Key Laboratory of Science and Engineering for Marine Ecology and Environment, The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | | | FAN Shiliang | Key Laboratory of Science and Engineering for Marine Ecology and Environment, The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | |
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| Abstract: |
| Intensive Pyropia aquaculture in the coast of southwestern Yellow Sea and its subsequent waste, including disposed Ulva prolifera, was speculated to be one of the major sources for the large-scale green tide proceeding in the Yellow Sea since 2007. It was, however, unclear how the detached U. prolifera responded and resumed growing after they detached from its original habitat. In this study, we investigated the growth and photosynthetic response of the detached U. prolifera to various temperature, salinity and irradiance in the laboratory. The photosynthetic rate of the detached U. prolifera was significantly higher at moderate temperature levels (14-27℃) and high salinity (26-32), with optimum at 23℃ and 32. Both low (<14℃) and highest temperature (40℃), as well as low salinity (8) had adverse effects on the photosynthesis. Compared with the other Ulva species, U. prolifera showed higher saturated irradiance and no significant photoinhibition at high irradiance, indicating the great tolerance of U. prolifera to the high irradiance. The dense branch and complex structure of floating mats could help protect the thalli and reduce photoinhibition in field. Furthermore, temperature exerted a stronger influence on the growth rate of the detached U. prolifera compared to salinity. Overall, the high growth rate of this detached U. prolifera (10.6%-16.7% d-1) at a wide range of temperature (5-32℃) and salinity (14-32) implied its blooming tendency with fluctuated salinity and temperature during floating. The environmental parameters in the southwestern Yellow Sea at the beginning of green tide were coincident with the optimal conditions for the detached U. prolifera. |
| 中文摘要: |
| 2007年以来，黄海连年爆发大规模浒苔绿潮，南黄海沿岸养殖筏架上的附生绿藻被认为是漂浮绿藻的主要来源之一。本研究对脱离筏架的浒苔样品进行室内培养实验，研究不同温度、盐度和光照条件下，其生长率和光合作用的变化，从而探讨浒苔脱离原附着基后适应不同环境的生理机制。结果显示，浒苔在14–27°C和26–32盐度范围内生长率和光合作用效率明显较高，最适温度和盐度为23°C和32，低温（<14°C）、高温（40°C）以及低盐（8）环境都不利于浒苔光合作用。与其他石莼属绿藻相比，浒苔对强光照具有较高的耐受性，其藻体复杂的分支结构，可能起一定的保护作用。温度对浒苔生长率的影响明显高于盐度的影响。总体而言，浒苔在5–32°C的温度范围和14–32的盐度范围内都能保持生长，而每年春季黄海南部的环境条件比较适宜脱落浒苔的快速生长。浒苔的内在生理特征与黄海南部适宜的环境条件相耦合，成为黄海浒苔绿潮爆发的原因之一。 |
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