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引用本文:祁闯,方家琪,张利民,雷波,汤响成,王国祥.太湖藻型湖区沉积物中生物易降解物质组成及分布规律.湖泊科学,2019,31(4):941-949. DOI:10.18307/2019.0423
QI Chuang,FANG Jiaqi,ZHANG Limin,LEI Bo,TANG Xiangcheng,WANG Guoxiang.Composition and distribution of biodegradable compounds in phytoplankton-dominated zone of Lake Taihu. J. Lake Sci.2019,31(4):941-949. DOI:10.18307/2019.0423
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太湖藻型湖区沉积物中生物易降解物质组成及分布规律
祁闯1, 方家琪1, 张利民1,2, 雷波1, 汤响成1, 王国祥1,2
1.南京师范大学环境学院, 南京 210097;2.江苏省地理信息资源开发与利用协同创新中心, 江苏省环境演变与生态建设重点实验室, 江苏省水土环境生态修复工程实验室, 南京 210023
摘要:
为研究富营养化湖泊藻型湖区沉积物中生物易降解有机质的组成及其垂向分布特征,选取太湖竺山湾湖滨带和开敞湖区采集沉积物柱状样,利用微电极技术测定沉积物-水界面理化指标的剖面特征,并对沉积物中含水率、烧失量、色素含量、总有机碳、总氮以及生物易降解物质(总蛋白、总糖和总脂)进行测定.结果表明:藻型湖区沉积物-水界面处溶解氧、pH和氧化还原电位在垂向剖面上呈现出随深度增加而下降的趋势,空间上存在明显的异质性,湖滨带沉积物-水界面溶解氧、pH和氧化还原电位显著低于开敞湖区,而沉积物-水界面H2S浓度在垂向上则表现为随深度先降低而后升高的趋势.此外,藻型湖区沉积物中生物易降解有机质的组成和分布同样存在明显的空间异质性.组成上以脂类(7.7 mg/g)为主,其次是糖类(4.5 mg/g),蛋白质(0.8 mg/g)含量最低;空间上,湖滨带沉积物中生物易降解有机质含量显著高于开敞湖区,表层15 cm以上沉积物含水率和烧失量较高,有机质含量丰富.
关键词:  太湖  藻积层  生物易降解物质  微电极  营养盐  沉积物
DOI:10.18307/2019.0423
分类号:
基金项目:国家水体污染控制与治理科技重大专项(2017ZX07203-003,2017ZX07202-004)、国家自然科学基金项目(41703105,41573061)和江苏省研究生科研创新计划(KYCX17_1065)联合资助.
Composition and distribution of biodegradable compounds in phytoplankton-dominated zone of Lake Taihu
QI Chuang1, FANG Jiaqi1, ZHANG Limin1,2, LEI Bo1, TANG Xiangcheng1, WANG Guoxiang1,2
1.School of Environment, Nanjing Normal University, Nanjing 210097, P. R. China;2.Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Jiangsu Key Laboratory of Environmental Change and Ecological Construction, Institute of Water Environmental Eco-remediation, Nanjing 210023, P. R. China
Abstract:
To better understand the distribution and composition of sedimentary bioclastic material in phytoplankton-dominated eutrophic lakes, we combined a spatial survey of surface sediments with sediment core analyses to quantify moisture content, ignition loss, pigments, total organic nitrogen, total nitrogen and biodegradable compounds changes in the littoral zones and off-shore areas. Results show that dissolved oxygen, pH and oxidation-reduction potential presented a clear downward trend with increasing depth, while the H2S concentrations gradually decreased with increasing depth and then increased in deeper layers until they reached a maximum and remained stable. In the littoral zones, the physicochemical parameters were mostly higher than that in the offshore areas. In addition, the biodegradable compounds showed significant spatial variability. Results show that lipids (7.7 mg/g), followed by carbohydrates (4.5 mg/g), was the dominant component of sedimentary bioclastic material. Data shows that the distribution of high moisture content, ignition loss and biodegradable compounds were mainly localization in the surface 15 cm of sediments.
Key words:  Lake Taihu  cyanobacterial-derived bioclastic deposit  biogradable compounds  microsensor  nutrient  sediment
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