阳宗海硅藻群落对水体污染和水文调控的长期响应模式

发布时间：2018-05-11 00:38

本文选题：湖泊沉积物 + 硅藻　；参考：《地理研究》2016年10期

【摘要】：在人类活动持续干扰的背景下,云南部分湖泊面临着污染物输入增加的环境压力,特别是营养盐富集和重金属污染。以云南地区遭受过严重工业污染的阳宗海为研究对象,通过沉积物硅藻群落、砷浓度、营养元素与稳定同位素、粒度等多指标分析,结合文献记录和湖泊调查结果,揭示了阳宗海硅藻群落对湖泊富营养化和砷污染的长期响应特征,并识别了不同时期的主要环境压力与其驱动强度。结果表明:长期的营养盐累积使得浮游硅藻逐渐占据优势地位,且耐污染的底栖硅藻种的快速增加与砷污染出现的时段一致。在阳宗海长期富营养化的背景下,当水体砷污染物浓度达到一定阈值水平后,硅藻群落结构的改变和多样性的降低都指示了湖泊生态系统发生了灾难性的转变。同时1965年开始的湖泊引水工程导致了贫营养种的突然增加。因此,水体富营养化、重金属污染与湖泊水文调控是导致阳宗海硅藻群落长期变化的主控因子,对阳宗海的生态修复与综合治理需要综合考虑不同胁迫因子的长期影响与驱动作用。
[Abstract]:Under the background of continuous disturbance of human activities, some lakes in Yunnan are facing increasing environmental pressure of pollutant input, especially nutrient enrichment and heavy metal pollution. Yangzonghai, which has been seriously polluted by industry in Yunnan Province, was studied through the analysis of diatom community, arsenic concentration, nutrient elements and stable isotopes, granularity, and so on. The characteristics of long-term response of diatom community to eutrophication and arsenic pollution in Yangzonghai Lake were revealed, and the main environmental pressures and their driving strength in different periods were identified. The results showed that long-term accumulation of nutrients made planktonic diatoms gradually occupy the dominant position, and the rapid increase of benthic diatom species resistant to pollution was consistent with the time period of arsenic pollution. Under the background of long-term eutrophication in Yangzonghai, when the concentration of arsenic pollutants in water reaches a certain threshold level, the change of diatom community structure and the decrease of diversity all indicate the catastrophic change of lake ecosystem. At the same time, the lake diversion project, which began in 1965, led to a sudden increase in the number of poor nutrient species. Therefore, eutrophication, heavy metal pollution and lake hydrological regulation are the main controlling factors for the long-term changes of diatom community in Yangzonghai. The long-term influence and driving effect of different stress factors should be considered comprehensively for the ecological restoration and comprehensive management of Yangzonghai.
【作者单位】：云南师范大学旅游与地理科学学院高原地理过程与环境变化云南省重点实验室;
【基金】：国家自然科学基金项目(U1133601,41171048,41461096,41302151) 教育部科学技术研究项目(213034A)
【分类号】：X524

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