沉水植物残体堆积量对沉积物理化性质的影响——以马来眼子菜为例  

The influence of the accumulation of submerged plant residues on the physicochemical properties of sediments——a case study of Malayan cabbage

作　　者：徐达 金伟 尉艺 王春柳 朱伯淞 化柯 周攀 刘新 XU Da;JIN Wei;WEI Yi;WANG Chun-liu;ZHU Bo-song;HUA Ke;ZHOU Pan;LIU Xin(College of Biology and the Environment,Nanjing Forestry University,Nanjing 210037,China;Nanjing Gaoke Construction Development Co.Ltd,Nanjing,210038,China;State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing,210008,China;Jiangsu Subot New Materials Co.Ltd,Nanjing,211103,China;Suzhou Suncadia Biopharmaceuticals Co.Ltd,Suzhou 215000,China)

机构地区：[1]南京林业大学生物与环境学院,江苏南京210037 [2]南京高科建设发展有限公司,江苏南京210038 [3]中国科学院南京地理与湖泊研究所,江苏南京210008 [4]江苏苏博特新材料股份有限公司,江苏南京211103 [5]苏州盛迪亚生物医药有限公司,江苏苏州215000

出　　处：《中国环境科学》2023年第3期1360-1367,共8页China Environmental Science

基　　金：江苏省双创人才计划(JSSCBS20211393);国家自然科学基金资助项目(51839011,U2240208);中国江苏省科技创新项目(BK20220043)。

摘　　要：通过将不同含量马来眼子菜残体堆积在沉积物中,分析表层沉积物理化性质以及流变特性变化,明确沉水植物残体堆积量对表层沉积物性质的影响.经过一个月的实验后,发现随着沉水植物残体堆积量的增加,表层沉积物密度呈指数型下降趋势,并伴随着浮泥形成.同时,粒径分布结果表明沉水植物残体在沉积物中的腐解导致了沉积物的絮凝和团聚.且沉积物胞外聚合物(EPS)中高比例的多糖/蛋白质使沉积物颗粒不易沉积,有利于浮泥形成.此外,流变试验中沉积物的屈服应力值与沉水植物残体堆积量呈指数衰减(R^(2)=0.97),当堆积量超过0.4%后,浮泥屈服应力逐渐稳定,易于发生再悬浮现象.因此,本研究加深了对沉水植物残体在沉积物腐解对沉积物性质影响的认识,并对沉积物治理具有重要意义.In this study,the influence of the accumulation of submerged plant residues on the properties of surface sediments was clarified by using different contents of Malayan vegetable residues in the sediments and analyzing the changes of physicochemical properties and rheological properties of surface sediments.After one month’s experiment,with the increase in the accumulation content of submerged plant residues,the surface sediment density decreased exponentially,accompanied by the formation of fluid sediment.Meanwhile,the results of sediment particle size distribution showed that the decomposition of submerged plant residues in the sediment led to the flocculation and agglomeration of the sediment.And the high values of polysaccharide/protein in extracellular polymeric substances(EPS)in sediments made sediment aggregates difficult to deposit,which is conducive to the formation of fluid sediment.In addition,the yield shear stress of sediments in rheological tests decayed exponentially(R^(2)=0.97)with the contents of submerged plant residues.And when the accumulation content exceeded 0.4%,the values of yield shear stress gradually kept stable,resulting in sediment suspension.Overall,this study deepened the understanding of the impact of submerged plant residues decomposition on sediment properties,and the results can be helpful to sediment management in shallow lakes.

关 键 词：浅水湖泊 沉水植物残体 沉积物 密度 胞外聚合物 流变特性 

分 类 号：X143[环境科学与工程—环境科学]