长江中下游湖泊富营养化过程探析——以龙感湖为例

Approaches to the eutrophication process of Longgan Lake in the Middle and Lower reaches of the Yangze River

长江中下游是我国湖泊富营养化问题比较严重的地区.长江中游湖泊--龙感湖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.通过对沉积物中湿地花粉与入湖营养盐关系以及磁化率的分析表明,人类活动导致的湿地破坏和土壤侵蚀是龙感湖富营养化发生的原因,同时指出,流域农业化肥的使用导致了水质的进一步恶化.

The lake eutrophication is severe commonly in the area of middle and lower reaches of Yangze River. 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. The studies based on the magnetic parameter and relationship between wetland pollen and lake nutrient state in sediments show that the lake eutrophication was related with the accelerated soil erosion in watershed and destruction of wetland vegetation which caused by human activities. The extensive use of chemical fertilizers in catchment enhanced trophic condition, resulting in further deterioration of water quality.