洱海表层沉积物营养盐的含量分布和环境意义

Content,Distribution and Environmental Significance of Nutrient salts in Surface Sediments in Erhai Lake

研究发现 ,洱海沉积物的总氮含量高值主要分布在靠近苍山的河流入湖口和东岸凤尾箐近岸处 ,而湖心区的总氮含量较低 ,有机氮占总氮的 95%以上 ;总磷高含量主要分布在洱海北部的湖心和弥苴河三角洲 ;总氮与有机氮、氨氮和可抽提有机质A %有明显的正相关性 。

The high content of Total Nitrogen (TN)of Erhai Lake sediments is found at the entrance near the Cangshan Mountain and the nearshore of east bank and the low content is the lake center. The research results indicate that the organic nitrogen content accounts for over 95% of the TN. The high content of Total Phosphate (TP)distributes at the center of North Erhai Lake and the Miju river Delta. The multiple regression composed of nutrient salts content and sediments suggests that there is apparent positive correlation between TN,TON(total organic introgen),NH 3-N and A%while the correlation between TN and TP is small which indicates that the environmental behaviors of Nitrogen and Phosphate are obviously different.