Study on the Characteristics of Nutrient Distribution of Surface Sediments under the Influence of Human Activities in Honghu Lake, Jiangxi Province

Abstract:

The vertical distributions of nutriment elements (TN, TP and TOC) in the columnar sediments of sampling site in Lake Hong of Jiangxi were determined on the basis of 210pb dating.In order to investigate vertical distribution characteristics of nutrient elements and the sequence feature changes over time,analyze the impact of human activities on the Lake district environment.The method of 210pb dating was used to derive accumulation rates of 0.407g/cm2.a-1,The results showed that the contents of all the elements lowered continuously with the increase of the sediment depth.The historical profiles of Hong Lake showed that TOCTN and TP mainly enriched in 0-37cm ,and presented simultaneously changeable trends. 1862~1953, TN, TOC and TP are in a relatively stable trend, human activities in this stage have less disturbance to the environment and natural factors play a major role, Lake is without pollution to the state, belonging to II~IIIstandard, the overall ecological environment of lake is stable. 1953~1992, TN, TOC and TP are in the rapid increase stage,and the vertical variation of amplitude became enlarged.In this period, the increase of human activity,especially the agricultural activities,resulted in nutrient element content higher.Lake is being III ~ IV standard.The lake eco-environmental issues began to emerge. From 1992 to 2011, the nutrient content is with high volatility, human activities is the main factors affecting the lake environment, organic index and organic nitrogen pollution is IV level standard,the lake environment problem aggravate.

• Periodical: Advanced Materials Research (Volumes 864-867)
• Pages: 897-902
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.864-867.897
• Online since: December 2013
• Authors: Ran Ran Kong, Ming Li Zhang*, Hao Yang
• Keywords: ²¹⁰Pb, Lake Sediments, Nutrient Elements

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