湖泊富营养化的生态修复策略

由于工业化的发展和人类生产活动的加剧,大量有机污染物不断排入湖泊并在其中积累,致使湖泊产生了富营养化现象,当前我国湖泊污染及富营养化问题非常严重。文中论述了湖泊富营养化的现状及危害,分析了产生的原因,指出生态修复是治理的最佳途径。因此,湖泊治理应该遵循先控源截污、后生态恢复,即先改善基础环境,后实施生态恢复的战略路线。     

Preferences for environmental quality under uncertainty

Although the expected effects of environmental policies and interventions are rarely known with certainty, stated preference surveys rarely elicit preferences over uncertain environmental outcomes. This article presents empirical results challenging the view that ignoring such uncertainty during preference elicitation is of no consequence so long as people only care about final environmental states. We show that measured preferences for final environmental states, water quality in this case, depend on whether people choose between final states or between lotteries over final states. In contrast to the typical finding for monetary lotteries, we find significant under-weighting of low probability events related to water quality.     

太湖蓝藻暴发的气象条件影响及其治理措施

蓝藻暴发是太湖面临的重大水安全问题,通过分析蓝藻的生理特性,结合太湖的气候特点,得到蓝藻水华形成的原因为营养盐和气象条件。水体污染造成的富营养化是蓝藻生长发育和暴发的基础,而气温、降雨量、日照时数等气象条件是蓝藻暴发的必要条件。只有上述条件同时具备．才有可能出现大规模的蓝藻暴发。现有的蓝藻治理措施主要有源头控制、化学方法、物理方法和生态修复等。