鉴湖的形成演变与肖绍平原的环境变迁

THE FORMATION AND EVOLUTION OF THE JIANHU LAKE ANDENVIRONMENT CHANGES ON THE XIAO SHAO PLAIN

本文主要讨论鉴湖的形成与流域内的环境发展变化问题,古鉴湖自全新世早期末至今,由于气候变化,海面升降等影响,曾经历泥炭沼泽、湖泊、泥炭沼泽、湖泊四个阶段。其中前三个阶段主要是受自然环境的变化而演变的,而后一个阶段主要是由于人为因素——筑堤扩大湖泊,围湖造田使湖泊缩小的。

The Jianhu Lake, one of the oldest irrigation works in East China,is located in the Xiaoshao Plain in eastern. Zhejiang Province. It played an impprtant role in the developmerit of the industry and agriculture and the cultral life on the Xiaoshao Plain.Studies on sediments in the Jianhu Lake area show that from theearly Neolithic period to the Yonghong years in the East Hart Dynasty the Jianhu Lake expericnced two cycles from swamp to lake influenced by the change of climate and sealevel.In 140 A.D.,people led by Mazhen took advantage of the favorable terrain to make the Jianhu Lake a large man-made lake with an area of 206 square kilometers, which has played an important role in the prevension of waterlogging, irrigation and shipping.In the Song Dynasty, the Jianhu Lake was silted up and became shallow. People reclaimed land from the lake on this basis, which made the Jianhu Lake a long river course-llke lake at present.