深水库藻类功能组演替特征及与其水动力关系

为了研究藻类功能组与水库水动力条件即水位及出入流量之间的关系，选取西北某深水型水库，引用了藻类功能组的分类方法，分析了水库2013年1月到2014年12月藻类功能组的演替特征；并结合冗余分析的方法研究了水库藻类功能组与水温、营养盐等因素的相关性关系；同时重点分析了优势藻类功能组B和P与水库水位及出入流量间的关系。结果表明：该深水型水库整体为贫-中营养状态；水库藻类可分为8个功能组（B、P、D、X1、MP、J、M和S1），其中功能组B和P为优势功能组；由冗余分析可知，藻类功能组B和P与水库水位及出入流量呈负相关性。高水位时藻类生物量较少，低水位时较多；出入库流量较小时，有利于藻类的生长，出入库流量接近或超过平均值时，藻类生长受到抑制。

Relationship between succession characteristics of algae functional groups and hydrodynamic in deep-water reservoir

In order to study the relationships between algae functional groups and reservoir hydrodynamic condition, including water level, effluent and inflow, a deep-water reservoir in Northwest China was selected as the study area.We analyzed the algal functional groups'succession characteristics using the algal functional groupsapproachduring a period fromJanuary 2013 to December 2014. We explored the relationships between algal functional groups and water temperature and nutrient salts, using the method of redundancy analysis (RDA). Meanwhile, the relationship of the functional groups B and P with the water level, effluent, and inflow were also studied. Based on the results, the reservoir nutritional conditions were classified as poor-mid. The functional groups B, P, D, X1, MP, J, M, and S1 were found in the reservoir and the functional groups B and P were the dominant functional groups. Through redundancy analysis, the functional groups B and P were found to be negatively correlated with the water level, effluent, and inflow. Low water levels of thereservoir were favorable for the growth of the algal functional groups and high water levels inhibited the growth of the algal functional groups.In addition,low effluent and inflow were beneficial for the growth of the algal functional groups, and when the effluent and inflowwere close to or exceeded the average level, the growth of the algal functional groupswasinhibited.