摘要
通过对草海2号孔硅藻植物群生态演化及沉积特征的研究,将草海晚更新世划分为十个硅藻带和五个环境演化段落,说明5万年以来草海经历了由河流三角洲—中深湖滨—浅湖—沼泽的发展过程,在距今4.4万年时,滇池湖达到高潮,以后一直湖退,其中距今2.8万年左右由于河口砂坝的发展而形成海埂,使草海与滇池相对隔离而进入一个独立发展阶段,并加快了草海沼泽化进程。从气候上看,5万年以来,草海也经历了凉—暖—凉—温的两次周期性变化。
Caohai is a pond which is situated in the westflorthern part of Dianci Lake, Yunnan. It is not interlinked with Dianci Lake, The ten Diatom Assemblages is from a core (C2) on the eastern fringe. The environmental sucession is divided five stages from 50,000 years througn the Diatom analyse: River——Deep lake——Middle deep lake——Shallow lake——Marsh. During primary period, Caohai was connected with Dianci Lake:about 1600—13000 years, lake dike formed, it became a small shallow pond; since then, it shrinked continually, it has finally become the marsh.
出处
《云南地理环境研究》
1993年第1期55-64,共10页
Yunnan Geographic Environment Research
