首页|期刊导航|中国海洋湖沼学报(英文版)|Impacta of CO2 enrichment on growth and photosynthesis in freshwater and marine diatoms
中国海洋湖沼学报(英文版)2008，Vol.26Issue(4)：407-414,8.DOI:10.1007/s00343-008-0407-7
Impacta of CO2 enrichment on growth and photosynthesis in freshwater and marine diatoms
Impacta of CO2 enrichment on growth and photosynthesis in freshwater and marine diatoms
摘要
Abstract
The physiological responses of Nitzschia palea Kiitzing, a freshwater diatom, to elevated CO2 were investigated and compared with those of a marine diatom, Chaetoceros muelleri Lemmermann previously reported. Elevated CO2 concentration to 700 μl/L increased the dissolved inorganic carbon (DIC) and lowered the pH in the cultures of N. palea, thus enhancing the growth by 4%-20% during the whole growth period. High CO2-grown N. palea cells showed lower levels of dark respiration rates and higher Ik values. Light-saturated photosynthetic rates and photosynthetic efficiencies decreased in N. palea with the doubling CO2 concentration in airflow to the bottom of cultures, although the doubling CO2 concentration in airflow to the surface cultures had few effects on these two photosynthetic parameters. N. palea cells were found to be capable of using HCO3- in addition to gaseous CO2, and the CO2 enrichment decreased their affinity for HCO3- and CO2. Although doubled CO2 level would enhance the biomass of N. palea and C. muelleri to different extents, compared with the marine diatom, it had a significant effect on the specific growth rates of N. palea. In addition, the responses of photosynthetic parameters of N. palea to doubled CO2 concentration were almost opposite to those of C. muelleri.关键词
carbon dioxide/Chaetoceros muelleri/elevated CO2/growth/Nitzschia palea/photosynthesisKey words
carbon dioxide/Chaetoceros muelleri/elevated CO2/growth/Nitzschia palea/photosynthesis分类
天文与地球科学引用本文复制引用
HU Hanhua,GAO Kunshan..Impacta of CO2 enrichment on growth and photosynthesis in freshwater and marine diatoms[J].中国海洋湖沼学报(英文版),2008,26(4):407-414,8.基金项目
the National Natural Science Foundation of China (No.90411018, 30270036) and by the Chinese Academy of Sciences （No.90411018, 30270036）
