长江中下游湖泊富营养化过程的湖泊沉积记录

长江中下游湖群区，历来是人类最活跃的场所，但由于近年来社会经济的迅速发展，湖泊富营养化问题日趋严重，对湖泊湿地变化与湖泊营养盐状况关系的分析是制定湖泊环境整治和生态修复的重要科学依据。长江中游湖泊——龙感湖的湖中心钻孔沉积物中硅藻组合和总磷变化记录了近百年来龙感湖富营养化过程。沉积物中湿地花粉与人湖营养盐关系以及磁化率的分析表明，流域内人类活动对湖周滩地的改造，破坏了湿地植被，助长了人湖物质的增加，湖泊营养相对富集，而流域农业化肥的使用导致了水质的进一步恶化。

Lake nutrients accumulation process from lacustrine records in the Middle and Lower reaches of the Yangtze River

The eutrophication of lakes is serious in the area of middle and lower reaches of Yangtze River as a result of rapid development of social economy in the last few decades. The scientific preventative measurements and restorative management require to provide more detailed background data and the relationship between wetland and lake nutrient state. The process of lake nutrients accumulation during the last century was recorded by the changes of diatom assemblages and total phosphorus in sediments from a core of central Longgan Lake, located in the boundary between Hubei and Anhui provinces. Based on the magnetic parameter and relationship between wetland pollen and lake nutrient state in sediments, the studies show that the degeneration of wetland vegetation caused the land nutrient discharges by human activities around the lake catchment and the lake nutrient enriched relativelyThe extensive use of chemical fertilizers in catchment enhanced trophic condition, resulting in further deterioration of water quality.