太湖沉积物耗氧速率空间异质性研究

摘要

Sediment Oxygen Demand （SOD） is a very useful parameter when used in appraising water quality and environmental characteristics comprehensively, and it has an important significance in analyzing water oxygen balance and assessing water environment quality. In this study the sediments are collected in different sites along Dapu coast to the center of Taihu Lake and along the south bank to the center of Taihu Lake. Based on the small volume method, the spatial heterogeneity of SOD in sediments of Taihu Lake is explored. The results show that the SOD reduces gradually with the increase of distance from the shore of the lake. SOD is posi- tively correlated to particle size distribution and interstitial water APA of sediments （P 0. 01）, and there is a negative correlation between SOD and APA of sediments（P〉0. 05）, but not significantly. There is a significantly negative correlation between SOD and the content of organic compound（P（0. 01）.%沉积物耗氧速率（sedimentoxygendemand，简称SOD）在综合评价水体水质和环境特征时是一个非常有用的参数，对分析水体氧收支平衡和评价水环境质量具有重要意义。采集了由太湖大浦沿岸到湖心及太湖南岸到湖心不同位点的太湖沉积物，采用微体积法研究了太湖沉积物SOD的空间异质性。结果表明：随着离湖岸距离的增加，沉积物SOD逐渐降低；沉积物SOD与沉积物粒度分布和间隙水APA呈极显著正相关（R2=0．867，P〈0．01；R2=0．929，P〈0．01），与沉积物APA呈负相关，但不显著（R2=-0．331，P〉0．05），与有机物含量呈极显著负相关（R2=-0．794，P〈O．01）。