中文关键词太湖生物易降解物质草型湖区沉积物营养盐 英文关键词Taihu Lakebiodegradable compoundsmacrophyte-dominated zonesedimentnutrient

作者	单位	E-mail
祁闯	南京师范大学环境学院, 南京 210097	qichuangnjnu@163.com
方家琪	南京师范大学环境学院, 南京 210097
张利民	南京师范大学环境学院, 南京 210097 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
司泽君	华东师范大学计算机科学与软件工程学院, 上海 200062
黄和笑	南京师范大学环境学院, 南京 210097
王卓森	南京师范大学环境学院, 南京 210097
李翔	南京师范大学环境学院, 南京 210097
王磊	南京师范大学环境学院, 南京 210097
王国祥	南京师范大学环境学院, 南京 210097 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	wangguoxiang@njnu.edu.cn

中文摘要 为研究富营养化条件下草型湖区水生植物碎屑快速沉积对沉积物中有机质组成及营养状态的影响，选取太湖胥口湾为研究区，采集沉积物柱状样，探究沉积物中色素、碳、氮、磷及生物易降解物质的组成和分布规律.结果表明，胥口湾沉积物中色素、碳、氮、磷及生物易降解物质整体表现为表层富集特征，主要集中在沉积物表层15 cm；沉积物中氮负荷高于磷负荷，且存在显著的空间差异性；沉积物TN含量在127.2~2092.8 mg·kg^-1，沉积物TP含量在222.1~528.4 mg·kg^-1，水生植物分布区（1033.6 mg·kg^-1）氮负荷显著高于无植被区（325.2 mg·kg^-1）.沉积物中生物易降解物质以糖类（3.7 mg·g^-1）为主，其次是脂类（2.8 mg·g^-1）和蛋白质（2.3 mg·g^-1）；水生植物碎屑残体是沉积物中营养盐和易降解有机质的主要来源，水生植物分布区沉积物中色素、碳、氮、磷及生物易降解有机质含量均显著高于无植被区（P<0.01）；胥口湾沉积物逐渐由中营养状态向富营养状态过渡，整体已经趋向于富营养化状态，在今后的湖泊管理和调控过程中需予以关注. 英文摘要 In shallow eutrophic lakes, benthic bioclastic deposits accumulate abundant organic carbon derived from macrophyte detritus. Taking the typical macrophyte-dominated Xukou Bay as the study area, field investigations were performed using sediment cores to evaluate benthic phytodetritus accumulation. Specifically, nutrient contents, TOC/TN ratios, pigmentation, and biodegradable compounds were measured as descriptive parameters. The results show that the benthic bioclastic deposit had accumulated abundant pigments, nutrients, and biodegradable compounds derived from macrophytes detritus. These were mainly localized in the top 15 cm of sediments. Nitrogen loading in the sediments was significantly higher than phosphorous loading, with a distinct spatial difference; the total nitrogen content ranged from 127.2-2092.8 mg·kg^-1 and total phosphorous content ranged from 222.1-528.4 mg·kg^-1. Moreover, nitrogen loading (1033.6 mg·kg^-1) in the vegetated zones were higher than in the unvegetated zones (325.2 mg·kg^-1). In addition, carbohydrate (3.7 mg·g^-1) was the dominant component of sedimentary bioclastic material, with lipids (2.8 mg·g^-1) being the second most abundant of the biodegradable compounds. The major sources of nutrients and biodegradable compounds in the sediment were massive aggregates of macrophyte detritus. The pigment, nutrient, and biodegradable compound contents in the vegetated zones were significantly higher than in unvegetated zones (P<0.01). The benthic eutrophic state showed a trend from mesotrophic to eutrophic in Xukou Bay, which should be given more attention in the future management of freshwater lake ecosystems.

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