文档介绍：Solar aspects of papers
In situ inhibition of solar UV-B on phytoplankton photosynthesis in two main river estuaries and their adjacent coastal waters of China
Weihua Zhoua, b, Kedong Yina, c, *Corresponding author: Atmospheric, Marine & Coastal Environmental (AMCE) Program/Department of Biology, Hong Kong University of Science and Technology, Kowloon, Hong Kong SAR, PR China. Tel.: +852-2358-7329; fax: 852-2335-9317.
E-mail address: ******@ (. Yin)
, Xiangchen Yuana, c
a South China Sea Institute of Oceanology, Chinese Academy of Sciences (CAS), 164 West Xingang Rd., Guangzhou 510301, China
b Tropical Marine Biological Research Station in Hainan, CAS, Luhuitou, Sanya 572000, China
c Key Laboratory of Tropical Marine Environmental Dynamics, CAS, 164 West Xingang Rd., Guangzhou 510301, China
Abstract
Several studies were carried out in the two largest estuaries in China, . Changjiang River Estuary (CRE), Pearl River Estuary (PRE), and their adjacent coastal waters, East China Sea and northern South China Sea, respectively, to examine the effect of solar ultraviolet radiation B (UV-B, 280 to 320 nm) on in situ phytoplankton photosynthesis from August 2002 to May 2003. The short-term impact of UV-B was assessed by exposing samples in quartz tubes to solar radiation under three radiation treatments: no cover receiving natural sunlight, covered with Mylar® film which cut off UV-B and under intensified artificial UV-B. Solar UV-B inhibited phytoplankton photosynthesis rates apparently. In CRE, the inhibition of solar UV-B to surface phytoplankton photosynthesis was % and % in summer and winter, respectively, while in PRE the inhibition was % from September to October. Size-fractionated phytoplankton incubation showed that ultraphytoplankton (<5 µm) was more adaptive to UV-B than larger size phytoplankton. When the UV-B inhibition was coupled with nutrients stress, the inhibition of UV-B on the phytoplankton carbon fixation was relatively lo