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题名: Reconstructing clear water state and submersed vegetation on behalf of repeated flocculation with modified soil in an in situ mesocosm experiment in Lake Taihu
作者: Tang, Xin1, 2, 3; Zhang, Xiaolin1; Cao, Te1; Ni, Leyi1; Xie, Ping1
关键词: Eutrophication ; Submersed macrophyte ; Repeated flocculation ; Ecological effects ; Submersed macrophyte restoration
刊名: SCIENCE OF THE TOTAL ENVIRONMENT
发表日期: 2018-06-01
DOI: 10.1016/j.scitotenv.2018.01.008
卷: 625, 页:1433-1445
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ; Life Sciences & Biomedicine
类目[WOS]: Environmental Sciences
研究领域[WOS]: Environmental Sciences & Ecology
英文摘要: The geo-engineering approach of modified soil flocculation has been widely applied to mitigate algal blooms and eutrophication in relatively small lakes. Nevertheless, its potential ecological risks and feasibility should be examined and identified prior to its application in large natural lakes given the multiple functions of these water bodies in human health and welfare. In situ mesocosm experiments on modified soil flocculation were performed in Lake Taihu during summer 2010 and 2011. Chitosan-moclifiecl kaolinite (CMK) soil was used to flocculate algal blooms and improve water transparency to facilitate the re-establishment of the submersed macrophyte Vailisneria natans in this shallow eutrophic lake. Moreover, the ecological effects of CMK soil were assessed. Results showed that repeated additions of CMK (0.3 g/L for each time) improved water quality in terms of Chl-a, TN, and TP concentrations; TN/TP ratio; turbidity; reclox conditions; and nitrification and denitrification activities. These effects lasted for.48 clays. After the fourth close of CMK, the biomass of all phytoplankton categories, except for that of Cryptophyta, decreased by >90% (ca. 1-2 x 106 cell/L or 0.38-0.55 mg/L of wet weight). Zooplankton biomass markedly decreased after the first CMK addition, and copepods became dominant. These effects, however, did not last for the long term. Most importantly, submersed V. natans was restored successfully when water clarity and quality were improved through repeated CMK flocculation. Nevertheless, the indices of carbohydrate depletion and free amino acid accumulation indicated that the plant experienced physiological stresses. The reestablishment of V. natans reinforced the positive effects of repeated CMK dosing on water quality, and promoted a clear water state. V. natans is recommended for vegetative restoration in shallow eutrophic lakes given its facile transplantation, high stress tolerance, and physiological traits, which can be applied as indices of post-flocculation effects. In summary, the combination of repeated CMK dosing and revegetation of V. notans can feasibly improve water quality and initiate the restoration of a clear water state in shallow eutrophic lakes. (C) 2018 Elsevier B.V. All rights reserved.
关键词[WOS]: HARMFUL CYANOBACTERIAL BLOOMS ; SHALLOW EUTROPHIC LAKES ; CHITOSAN-MODIFIED SOILS ; MODIFIED LOCAL SOILS ; ENCLOSURE EXPERIMENT ; ECOLOGICAL RESTORATION ; AMMONIUM ENRICHMENT ; AQUATIC MACROPHYTES ; PHOSPHORUS RELEASE ; MICROCYSTIS BLOOMS
语种: 英语
项目资助者: State Key Laboratory of Freshwater Ecology and Biotechnology(2016FBZ08) ; Natural Science Foundation of Jiangxi Province(2015ZBBF6008)
WOS记录号: WOS:000426356600144
ISSN号: 0048-9697
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内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/342005/50669
Appears in Collections:淡水生态学研究中心_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Donghu Expt Stn Lake Ecosyst, Wuhan 430072, Hubei, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Water Resources Co Ltd, Huaian Surveying & Design Inst, Nanjing 211102, Jiangsu, Peoples R China
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