摘要
底泥作为河流营养物质的主要储集层,其主导的内源污染物释放对河流上覆水及其微生物多样性有重要影响。文章以绵阳市木龙河为研究对象,对河道上覆水与底泥中污染物质分布、原核生物与真核生物生物群落结构及其与内源污染释放构效关系进行了深入研究。实验结果发现木龙河上游到下游上覆水总氮(TN)、氨氮(NH3-N)及总磷(TP)浓度均呈现逐渐提高的趋势,对应的微生物多样性和丰富度却呈明显下降趋势,且主要优势物种为浮游藻类与真菌;在木龙河底泥中,总碳、总有机碳、TN、TP从上游到下游呈现递减的趋势,与上覆水成反相关,且主要优势微生物为浮游动物,与上覆水亦明显不同。研究结果表明,木龙河水质超标主要由底泥内源污染物释放导致,底泥中TN、总硫、NH3-N对底泥中微生物多样性影响显著;此外,以内源释放为特征的河流,由于内源释放污染物与外源污染物有一定差异,导致上覆水微生物多样性与外源污染条件下呈现不同。
The release process of endogenous pollutants of eutrophication sediment in urban river has an important effect on the water quality and microbial diversity.In this paper,the pollutants distribution of overlying water and sediment,community structure of prokaryotes and eukaryotes,and its structure-activity relationship in Mulong River of Mianyang are investigated.The results showed that the concentrations of total nitrogen(TN),ammonia nitrogen(NH3-N),and total phosphorus(TP)continued to rise from upstream to downstream in overlying water,except for the microbial diversity and richness decreased with it.On the contrary,main indicators such as total carbon(TC),total organic carbon(TOC),TN,and TP in sediment of river decreased from upstream to downstream.Moreover,the dominant species were plankton-algae and fungi in overlying water.While in sediment,the dominant species were zooplankton.These results indicated that endogenous pollutants release of eutrophication sediment is the major factor of water quality pollution of Mulong River.In addition,TN,TS and NH3-N had a significant impact on the microbial diversity in the sediment.The microbial diversity of overlying water also will be changed when the pollutants sources changed from exogenous to endogenous.
作者
李函珂
杨远坤
王彬
谌书
文新宇
封小倩
唐阳
LI Hanke;YANG Yuankun;WANG Bin;CHEN Shu;WEN Xinyu;FENG Xiaoqian;TANG Yang(School of Environment and Resource,Southwest University of Science and Technology,Mianyang 621010,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2021年第3期29-36,共8页
Environmental Science & Technology
基金
四川省重大专项计划(2018SZDZX0026)
四川省重点研发计划(2020YFS0306)
四川省重点研发计划(2019YFS0055)。
关键词
城市河流
内源释放
水体污染特征
细菌群落
微生物多样性
urban river
endogenous release
characteristics of water pollution
bacterial community
microbial diversity
