高职院校环境素质教育现状及对策研究

加强高职院校环境素质教育是实现社会科学可持续发展的有力保证。从高职院校学生的环境意识及态度、环境知识及行为、学校环境素质教育开展状况等方面对高职院校环境素质教育现状进行了分析。在此基础上,从完善高职院校环境素质教育目标体系、改进环境素质教育课堂教学模式及教学方法、在校园文化建设中渗透环境素质教育以及拓展环境素质教育实践途径等方面探讨了加强高职院校环境素质教育的对策及方法。     

高职院校“环境工程原理”项目课程的整体设计

基于当前环境工程原理课程的开设现状和对高职课程项目化教学的思考,率先将项目化教学理念引入到环境工程原理教学当中。基于工作过程导向的理念,以典型环工单元设备操作与优化控制为载体,对环境工程原理课程进行了项目化整体设计与实施,以提高学生的综合职业能力、岗位适应能力和可持续发展能力。     

Effect of Lanthanum （Ⅲ） on Reactive Oxygen Metabolism of Soybean Seedlings under Supplemental UV-B Irradiation

The effect of lanthanum （Ⅲ） on reactive oxygen metabolism of soybean seedlings under elevated ultraviolet-B radiation（UV-B：280~320 nm）at 0.15 and 0.45 W·cm-2 levels respectively was studied through hydroponics in the laboratory.Plasmolemma permeability and contents of malonadialdehyde（MDA）,hydrogen peroxide（H2O2）,and proline gradually increased during the imposition of UV-B radiation and subsequently decreased during recovery from UV-B stress.The dynamic tendency of catalase（CAT）activity was similar to that of the above four indices.The activity of peroxidase（POD）initially increased,then remained at a high level,and finally dropped steeply when soybean seedlings were exposed to a low dosage of UV-B radiation.However,POD activity rose throughout and declined slightly on the eleventh day when soybean seedlings were stressed by a high dosage.With the addition of La （Ⅲ） of 20 mg·L-1,the rising tendency of plasmolemma permeability and contents of MDA,H2O2,and proline were slowed down during the stress period,whereas the declining speed was accelerated during the recovery period.The activities of CAT and POD were higher than those without La （Ⅲ） in all experiments.It suggested that the regulative effect of La （Ⅲ） on antioxidant enzymes such as CAT and POD could strengthen their capacities to scavenge reactive oxygen species（ROS）,decrease contents of MDA and proline,and maintain normal plasmolemma permeability.Further more,the protective potential of La （Ⅲ） was better under low UV-B radiation than under a high one.