Behavior Study On The Process Biochemical Dynamics For Dominant Algae Species In The Three Gorges Reservoir Region

The 6,380-kilometers-long Yangtze River is the longest river in China and the third longest river in the world. The Three Gorges Project, China's largest water conservation project posterior to the Gezhouba Water Conservation Project, will play an important part in anti-flood, power generation, navigation, water conservation, and tourism. Phytoplankton is one of the water ecosystem components and primary producers, their community structure and quantity is greater important to succession and development of water ecosystems. The dam of Three Gorges Project is 185meters above sea level, and spans over 2,300 meters. The initial processing water level in 2006 will reach 165 meters high, and the final processing water level in 2009, 175 meters high. The water level came to 135 meters above sea level in June 2003. Phytoplankton is one of the water ecosystem components and is primary producers, their community structure and quantity is greater important to succession and development of water ecosystems. And the construction of a reservoir in the process, because of the hydrodynamic conditions change, the phytoplankton species and quantity would normally change, and even appear "growth insanely" and lead to algal blooms. Therefore, it is grasped that the change of phytoplankton for the eutrop- hication and the implementation of ecosystem management, which is of great significance especially for cause "algal blooms" that was the typical outbreak of the biological dynamics of the study are particularly important.This article according to the analysis of phytoplankton data and relating environmental factors from five monitoring sites located at the Jialing river section in Chongqing urban in the Three-Gorges valley, and combing all experimental measuring results and theoretical calculation, the evolution of dominant algae species under different hydrological condition has been studied systemically, and a conclusion of algal blooms to appear in the Jialing river would be dominant blue-green algal blooms at the greatest possible under cooperation effect of various environmental factors. Therefore, from the dominant blue-green algae species representative algae, namely, Chlorella Vulgaris belonging to the Chlorophyta has be- en selected as one of the studying algae species in order to investigate the effect of TN, TP on the growth behavior of CV in our laboratory, and the semi-saturation constants of CV to TP(KSP) and TN(KSN) have been calculated. The results of KSN to be extremely higher than KSP showed that the effect of TP on growth of CV is extraordinary significant than that of TN. Finally, in order to reveal whether there was a generalized character associating the growth dynamics of CV with that of dominant blue-green algae species, the dynamic models including CV constructed from our experimental data, dominant blue-green algae and sea algae from literature information have been compared and analyzed systemically, and the results showed that their growth dynamics behavior and ecological characteristic were extremely similar and common. According to extrapolation of the intercommunity of all growth dynamics we could describe and show availably there is a common behavior to the growth of dominant blue-green algae in the Three Gorges reservoir region. This conclusion would have some important theoretical and applied significance.