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和不同特征的区域物质循环，同时还发现了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 nitrogen and different characteristics of the areas of material recycling, and also discovered the TN for the effects of eutrophication.

This paper through the study of Pu'er sea sediments, clarify Erhai histogram sediments in total nitrogen distribution characteristics and different characteristics of the region, and at the same time have also found the material cycle for TN Lake eutrophication.

The present paper through to the Erhai deposit research, clarifies in the Erhai columnar deposit the total nitrogen distributed characteristic and the different characteristic region circulation of materials, meanwhile has discovered 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 and the different characteristics of regional material circulation, also found TN for Lake eutrophication effects.

This thesis ost form of Erhai Lake the distribution characteristic of total nitrogen and the regional materials of different characteristics are circulated in the sediment in post form of Erhai Lake ts, also found TN influence on eutrophication of lake at the same time.