大气污染的湖泊响应及其代用标志

The Lacustrine Responses Towards Atmospheric Pollution and Related Proxies

通过洱海和阳宗海大气污染的湖泊响应、代用标志提取和原因分析以及地表水酸化理论和自然酸性湖泊的对比研究,揭示湖水总矿化度和SO42-的同步异常增大是湖泊早期受酸沉降危害的标志. 保存于沉积记录中的磁化率、非磁滞剩磁和介形类、硅藻的数值和种群、密度等变化,可灵敏地揭示湖泊受大气污染的起点、过程和环境影响,可作为酸沉降较重湖区的代用标志.

The detailed studies were carried out on the lacustrine sediments from both the Lake Erhai and the Lake Yangzonghai, concerning the lacustrine responses towards the atmospheric pollution. Based on magnetic and biological proxies, as well as comparing acidification theory of surface water with naturally-acidified lakes, it is being revealed that anomaly synchronic increase on both the total degree of mineralization and anion SO42- are indicators of lake affected by acid deposition. Low frequency magnetic susceptibility ( ), anhysteretic remanent magnetization (ARM), and the changes of the concentration and species of ostracoda and diatom preserved within the lacustrine sediment could be used as indicating proxies, because of their sensitivity towards atmospheric pollution on the lake, including pollution history, its process and its effect on the environment.