在人类活动和自然变化的共同影响下，全球湖泊生态系统经历着前所未有的变化。科学地评估气候变化和人类活动对湖泊生态系统的影响，已成为当前国际湖沼学的研究热点之一。本项目拟通过对云南地区末次盛冰期以来不同类型湖泊沉积硅藻种群组合分析，辅以其他环境指标的高分辨率研究，探讨湖泊生态系统对气候事件的响应模式，揭示湖泊生态系统对气候事件的敏感性、抵抗力和弹性范围。同时，通过对近两百年来不同类型湖泊沉积硅藻种群组合分析，结合气候参数、人类活动信息、历史文献记载以及湖泊地球化学和其它生物指标，运用统计分析的手段，揭示在气候和人类活动双重影响下湖泊生态系统不同演化阶段适应与调节的弹性范围，发生突变的驱动因素，确定生态系统转化的阈值，提取突变的早期信号。同时通过对不同增暖期比较，分析生态系统多不同增温速率响应的特点与差异，为正确评估现代增暖的生态环境效应、预测未来湖泊生态系统变化趋势提供科学依据。

With human activities and natural changes, global lake ecosystems undergoing unprecedented change. Scientific assessment of the impact of climate change and human activities on the lake ecosystem, has become one of hot spot at international limnology. The project will study diatom assemblages inn different types of lake sediments since the Last Glacial Maximum in Yunnan region. With other high-resolution of the environmental factors, we will study on the response pattern of lake ecosystems to climate events, snd reveal sensitivity, resistance and elasticity range of the lake ecosystem to climate events. We will also study diatom assemblages inthe different types of lake sediments (about 200 years). With climate parameters, human activity information, history, literature, and geochemical and biological factors, and the using statistical analysis, we will reveal adapt and adjust range, and driving factors, and early mutation signal of lake ecosystems. At the same time, through the comparison of the different warming periods, we will analysis characteristics and differences of the ecosystem with warming rate, and to provide a scientific basis for the correct assessment of the ecological environment of the modern warming effect, to predict the future trend of lake ecosystems.