香溪河库湾春季叶绿素a浓度动态及其影响因子分析  

ANALYSIS OF THE SPATIAL AND TEMPORAL CHANGES OF CHLOROPHYLL A CONCENTRATION IN XIANGXI BAY IN SPRING AND ITS IMPACT FACTORS

作　　者：韩新芹[1,2] 叶麟[1,2] 徐耀阳[1,2] 蔡庆华[1] 

机构地区：[1]中国科学院水生生物研究所,淡水生态与生物技术国家重点实验室,武汉430072 [2]中国科学院研究生院

出　　处：《水生生物学报》2006年第1期89-94,共6页Acta Hydrobiologica Sinica

基　　金：中国科学院知识创新工程重要方向项目(KSCX2-SW-111);国家自然科学基金重点项目(30330140);国家重点基础研究发展规划(973)项目(2002CB412310)资助

摘　　要：2005年3月至4月,对三峡水库香溪河库湾的叶绿素a动态及其与TN、TP等环境因子的关系进行了研究。结果表明,从香溪河库湾下游到上游,叶绿素a存在明显的水平分布。在时间分布上,3月17日暴发一次大规模的水华,4月份水华的暴发有一个明显的平面推移的过程。叶绿素a浓度与TN、TP之间存在着一定的负相关关系,TN与叶绿素a浓度的相关性较显著。香溪河库湾极可能是N限制型水体,而不受P限制。叶绿素a与透明度存在反双曲线关系,与溶解氧呈显著正相关关系。The investigations on chlorophyll α of the water body, total nitrogen, total phosphorus and other environmental factors were carried out at 14 sampling sites of Xiangxi Bay of Three Gorges Reservoir from March to April 2005. We have also analyzed the spatial and temporal variation of chlorophyll α and its relationship with environmental factors. Chlorophyll a was extracted and measured according to procedures of UNESCO＇s spectrometer methods under 750nm, 665nm,645nm and 630nm wavelengths. Dissolved oxygen and nutrient data were supplied by the chemical working group of the research project. The result showed that from the upper reaches to the lower reaches of the Xiangxi Bay, there was evident horizontal variation of chlorophyll α concentrations in the water column. One bloom event occured at March 17th at a very large scale. Then bloom went forward from the lower reaches to the upper reaches along with the time in April. In detail, bloom event occurred at April llth at the sampling sits of group Ⅰ ,then about five days later it occurred at the sampling sits of group Ⅱ. Bloom event occurred at the sampling sits of group Ⅲ between April 16th and April 22th,while it occurred at April 22th at the sampling sits of group Ⅳ . Obviously, ecological factors, including total nitrogen, total phosphorus, water temperature, transparency and dissolved oxygen, had significant impact on the concentrations of chlorophyll α directly and indirectly. Generally speaking, total phosphorus increased from the lower reaches to the upper reaches of the Xiangxi Bay, while total nitrogen decreased first, then increased. The result obtained showed that on the one hand total phosphorus and total nitrogen were enough for the growth of phytoplankton, on the other hand the ratio of total nitrogen to total phosphorus was very low, which ranged from 0. 57 to 21.14. The relationship between chlorophyll α and total nitrogen, total phosphorus was negative to some extent. The correlation coefficent between chlorophyll α and tota

关 键 词：香溪河库湾 叶绿素α 环境因子 水华 

分 类 号：Q178.5[生物学—水生生物学]