求翻译：本论文通过对洱海沉积物的研究，弄清楚洱海柱状沉积物中总氮的分布特征，探讨不同特征的区域物质循环，同时研究TN对于湖泊富营养化的影响。是什么意思？

This paper studies by Erhai Lake sediments, clear Erhai Lake core sediment in the distribution of total nitrogen to explore the different characteristics of the area of ​​material circulation, while TN for the study of the impact of eutrophication.

This paper through the study of Pu'er sea sediments, clarify Erhai histogram sediments in total nitrogen distribution characteristics, to explore different features, at the same time, to examine the regional material cycle TN for Lake eutrophication.

The present paper through to the Erhai deposit research, clarifies in the Erhai columnar deposit the total nitrogen distributed characteristic, the discussion different characteristic region circulation of materials, simultaneously studies TN regarding the lake eutrophication influence.

Study of this papers through the sediments of Lake erhai, identify chuer haizhu distribution characteristics of total nitrogen in sediments, exploring different characteristics regional material circulation, also study the impact of TN for eutrophication.

This thesis through study on sediment of Erhai Lake, understand Erhai Lake total distribution characteristic of nitrogen under in post form sediment, the regional material which canvasses different characteristics is circulated, study TN influence on eutrophication of lake at the same time.