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引用本文:赵巧华,孙国栋,王健健,于志国,姜勃.水温、光能对春季太湖藻类生长的耦合影响.湖泊科学,2018,30(2):385-393. DOI:10.18307/2018.0210
ZHAO Qiaohua,SUN Guodong,WANG Jianjian,YU Zhiguo,JIANG Bo.Coupling effect of water temperature and light energy on the algal growth in Lake Taihu. J. Lake Sci.2018,30(2):385-393. DOI:10.18307/2018.0210
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水温、光能对春季太湖藻类生长的耦合影响
赵巧华, 孙国栋, 王健健, 于志国, 姜勃
南京信息工程大学水文气象学院, 南京 210044
摘要:
环境因素对藻类生长的影响机制是探讨蓝藻水华暴发的基础,其中水温和光能均是影响藻类生长的关键物理因子.基于2015年春季于太湖观测的11次藻类总初级生产力、水温廓线和营养盐浓度等,探讨水温、光能及营养盐对藻类生长过程的影响.结果表明:春季,水温、光能是影响藻类生长的关键因素,而营养盐的影响贡献相对较弱.深层水体中光能是藻类生长的关键性限制因子,浅层表现为水温、光能的共同影响,而表层主要表现为光能的抑制.水温的升高促进藻类对光能的获取和利用,提高光抑制的光能阈值,造成深层水体中光能限制程度的加强,藻类生长呈现光限制的深度变浅.本研究有利于确定气候变化下水生生态系统演变的方向,为水生生态系统的恢复提供理论依据.
关键词:  水温  光能  藻类生长  耦合  太湖  梅梁湾  藻类总初级生产力
DOI:10.18307/2018.0210
分类号:
基金项目:国家自然科学基金项目(41371222,51609116)、江苏省自然科学基金项目(BK20160961)和中央级公益性科研院所基本科研业务项目(Y516034)联合资助.
Coupling effect of water temperature and light energy on the algal growth in Lake Taihu
ZHAO Qiaohua, SUN Guodong, WANG Jianjian, YU Zhiguo, JIANG Bo
School of Hydro-Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, P. R. China
Abstract:
The effect of environmental factors on the gross primary production of phytoplankton is a basis for understanding the cyanobacteria bloom. Hereinto, water temperature and light energy are the key physical factors affecting phytoplankton growth. Based on phytoplankton primary productivity, water temperature profile and nutrient concentration observed in Lake Taihu in the spring of 2015, we explored the effects of these environmental factors on the the algae gross primary production. Results showed that in spring, water temperature and light energy were the key factors affecting algae growth, but the effect of nutrient was relatively weak in deep layers. The light energy and water temperature jointly affected the gross primary production of phytoplankton in shallower layer. The production were inhibited by light energy in surface layer. The water temperature increase promoted the ability of algae for the acquisition and utilization of light, improved the threshold value of light limitation, and enhanced the effect of light limitation, and shallowed the photo-inhibition depth. Current study is helpful to determine the evolution direction of aquatic ecosystems under climate change, and to provide an approach for the aquatic ecosystems restoration.
Key words:  Water temperature  light energy  algal growth  coupling  Lake Taihu  Meiliang Bay  gross primary production of phytoplankton
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