湖泊中磷的循环与沉积作用

地壳存在大量微溶性磷酸盐矿物，是湖泊中无限的磷源。中国云南省的滇池周围分布着大量早寒武世梅树村期磷块岩，其可溶性大于内生磷灰石，因此滇池湖水中磷的浓度提高，达０．０４～０．３８ｍｇ／Ｌ，是一般湖水中磷浓度的４～１０倍。藻类与细菌在滇池大量繁殖，摄取磷等营养物质，死亡后又被分解生成可溶性颗粒有机磷，磷质又返回湖水中，而那些分解后的水溶部分、不易分解的顽性组分或者不能为后来的生物所利用的组分，形成泥状沉积物或有机泥浆沉入湖底加入湖相沉积物。

CIRCULATION AND CONCENTRATION OF PHOSPHORUS IN GENENERAL LAKE WATERS

There are large amounts of slightly soluble phosphate minerals in the crust which can provide general lake waters with unlimited phosphate matter. Take the Early Cambrian Meishucun stage phosphorite which widely spreads over the area around the Dianchi lake. With a solubility far more than endogenic apatite, the phosphorite has been releasing a great deal of phosphrus into the lake, leading to a phosphrus concentration in the lake waters of 0.04 0.38g/l, 4 10 times those of the other lakes. This situation specially favours algal and bacterial microorganisms to flourish in the lake at the expense of the rich phosphorus matter. Some of the microorganisms, following their death, will be decomposed into fine soluble organic phosphorus which later return to the lake waters while the rest, hard decomposed, can not be taken up by microorganisms to ultimately join, as organic mud, the lacustrine deposition on the lake floor.