云南高原湖泊滇池和星云湖pH值特征及其影响因素分析

pH Characters and Influencing Factors in Dianchi and Xingyun Lakes of Yunnan Plateau

pH值偏高是云南高原湖泊存在的特征性问题。磷是湖泊富营养化的主要限制因子,研究表明,随着水体pH值的升高,沉积物的释磷量明显增加,增幅甚至可达几百倍。过量的氮、磷从地表水中汇入是造成湖泊富营养化的重要原因,但是磷从底泥中释放造成的影响也不容忽视,这使得用控制沉积物与湖水界面物-化要素限制磷释放的研究更显重要。为了给高原湖泊治理提供依据,从滇池湖区地质背景、浮游藻类、溶解氧、大地热流、水质富营养化等方面研究pH值的时空变化及其影响。

Lakes of Yunnan plateau are characterized by their high pH values. The present researches indicated that there is a fixed relationship between pH values and phosphorus released from lake bottom sediments, revealing that quantities increase along with rising pH value can get up several hundred times. Phosphorus is a main limiting factor of eutrophication in lakes. Excessive input of nitrogen and phosphorous is an important reason of lake eutrophication, but the release of phosphorous from lake sediment is a factor that was not to be ignored in the region. It seemed that the researches on relationship between phosphorous release and physical and chemical conditions of lake bottom may be more important in eutrophication. The paper studies the pH space - time varieties and their influences through the distribution of carbonate rock, planktonic algae, dissolved oxygen, underground warm current, water pollution etc, which may provide a basis for Dianchi restoration.