特约文章： 乌梁素海覆冰特征及其对营养盐分布的影响分析

Ulansuhai Lake is a typical shallow lake located in a cold and arid region. We have simulated its ice thickness in winter time using an empirical degree-day model based on its daily temperature data and nutrients concentration in the ice seasons from 2007 to 2014, focusing on ice cover impact on the trophic variation of shallow lakes. The results show that the growth in the lake’s ice cover is controlled mainly by thermal process and this degree-day model gave a satisfactory prediction of the maximum ice thickness for each year that is rather close to the measured values. For the period of 2007-2014 when the ice thickness took a decreasing trend, the simulations reveal the corresponding variations in nutrients concentration of this shallow lake in winter season. And using these results, we can explain why the longest ice cover in the years of 2008 and 2012 is possibly connected to the events of spring algal bloom in these two years. This study provides new ideas for water environmental protection and health warning of shallow lakes in cold and arid regions.     

基于AHP-熵权法的岱海湖泊健康评价指标体系研究

文章在岱海水生态安全研究的基础上，基于层次分析-熵权模型，构建了岱海湖泊健康评价体系。评价指标体系中，水文水资源准则层对湖泊健康影响较大，社会服务准则层和物理结构准则层对岱海湖泊健康影响较小，对湖泊健康影响较大的指标为入湖流量变异程度、最低生态用水满足程度、富营养化指数、公众满意度。