Temporal and spatial differences of lake ecosystem regime shift in China

人类活动的加强导致湖泊生态系统发生“突变”，造成生物多样性下降、藻类暴发、水质恶化等等环境和生态问题.中国许多湖泊已经发生“突变”或面临着突变风险.获悉湖泊生态系统发生突变的时空差异对于区域湖泊的保护，预防湖泊突变的发生以及制定合适的修复策略至关重要.本研究收集了中国55个不同区域湖泊的古湖沼学数据，探讨了湖泊突变的区域特点.研究确定了湖泊生态系统发生突变时间和区域差异，并揭示了空间差异的原因.结果表明，中国湖泊生态系统突变时间的区域分异特征为：长江中下游湖泊最早出现突变；东部和东北湖区湖泊突变时间明显早于西南、内蒙古和新疆湖泊；各湖区内，城郊湖泊突变时间早于乡村湖泊.人类活动强度是造成湖泊突变时空差异的主要驱动力.研究认为，区域人类活动强度影响了湖泊生态系统的演化进程，造成了中国湖泊生态系统突变的区域差异.本研究从生态系统突变的角度，利用古湖沼学综述了中国湖泊生态系统在人类活动下的演化进程，更深刻地认识了中国湖泊现状，为湖泊保护提供了有力的科学依据.;Increased human activity has caused a regime shift in lake ecosystem, which causes environmental and ecological problems such as biodiversity decline, algae blooms deterioration of water quality. Many Chinese lakes have undergone or are facing the risk abrupt change. It is essential to know temporal spatial differences for protecting preventing formulating appropriate restoration strategies. This study collected paleolimnology data 55 different regions China discussed regional characteristics mutations. The determined ecosystem revealed reasons differences. Our found that time differentiation: middle lower reaches Yangtze River much earlier than whole country. Regime happens east northeast areas southwest, Inner Mongolia Xinjiang lakes. In various region, suburban rural intensity activities main driving force shift. Lakes with slower warming but stronger more likely undergo result suggests affected evolution progress ecosystems From perspective change this uses summarize under activities, achieves deeper understanding current situation lakes, provides strong scientific basis protection.