华北平原全新世水文环境变化-以大陆泽为例

North China plain is one of the most major grain-producing region in China, therefore its environmental and hydrological conditions are so vital for its sustainable development. Here it is aimed to study the environmental and coupled hydrological changes in the Holocene, with focused period of the past 3000 years, using the geological and historical records from the Daluze lake, located at the western part of North China plain. We will carry out AMS C14 and OSL dating method to build up reliable timescale, and also measure the environmental and hydrological proxies, finally reconstruct the climate changes in the Holocene, especially the hydrological condition in the past 3000 years. Using these updated information, we will try to uncover the coupled process between climate and hydrology changes to obtain the factors that controls the hydrological changes.

华北平原是我国主要产粮区之一，也是重要的工业区，大中城市林立，而水资源却严重不足，水文生态环境严峻。重建该地区全新世的水文环境和生态环境演变历史，分析制约该区水文环境变化的主要动力因子，将有助于更准确评估现在的水文环境状况和预测未来的可能演变趋势，并为华北平原良好的水文环境重建提供一方面重要的科学依据。本项目以大陆泽为研究对象，通过对华北平原大陆泽人工剖面、钻孔岩芯的系统观测和描述、高密度取样、各种沉积环境指标分析测试、精确的沉积地层年龄测定（如AMS14C、OSL等方法），对大陆泽全新世不同时段湖泊水动力状况、盐度和水生环境、周围植被等进行研究，重建大陆泽全新世（尤其最近二、三千年）水文环境变化的时间序列，进一步探讨水文环境变化的驱动因子，如全球或区域气候变化、流域河流水文（尤其大旱和特大洪水事件）及河道变迁、人类活动等，从而获得改善该地区水文环境的认识和建议。