文献类型：期刊文献

英文题名：The fate of cyanobacterial blooms in vegetated and unvegetated sediments of a shallow eutrophic lake: A stable isotope tracer study

作者：Li, Kuanyi[1,2];Liu, Zhengwen[1,3];Gu, Binhe[4]

机构：[1]Chinese Acad Sci, State Key Lab Lake Sci & Environm, Nanjing Inst Geog & Limnol, Nanjing 210008, Peoples R China;[2]Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China;[3]Jinan Univ, Inst Hydrobiol, Guangzhou 510630, Guangdong, Peoples R China;[4]Guangdong Ocean Univ, Fishery Coll, Zhanjiang 524000, Peoples R China

年份：2010

卷号：44

期号：5

起止页码：1591

外文期刊名：WATER RESEARCH

收录：SCI-EXPANDED(收录号：WOS:000275706600031)、、EI(收录号：20100812720358)、Scopus(收录号：2-s2.0-76749152324)、WOS

基金：This study was supported jointly by National Basic Research Program of China (2008CB418104) and National Key Technology Research and Development Program (2007BAC26B02). We thank Dr Enlou Zhang for isotope analysis, Dr Amy-Jane Beer for the English improvements of this manuscript, and two anonymous reviewers for constructive comments.

语种：英文

外文关键词：Common reed; N-15 labeling; Microcystis; Sediment

外文摘要：An experiment using nitrogen stable isotope tracer (N-15) was conducted to track the fate of nitrogen derived from cyanobacterial blooms and the effectiveness with which the seasonal blooms are retained by vegetated and unvegetated sediment in a large shallow eutrophic lake (Lake Taihu, China). N-15 enriched Microcystis was injected into both unvegetated sediment and sediment occupied by common reed (Phragmites australis) in the littoral zone. Nutrient retention by the vegetated sediment was greater than by the unvegetated sediment, resulting in higher delta N-15 in the sediment nitrogen pool. The labeled Microcystis material was also distributed deeper into the vegetated sediment than the unvegetated sediment. A portion of the Microcystis-derived nitrogen was quickly assimilated, appearing first in the belowground biomass and subsequently in the aboveground biomass of the reed plants. The labeled nitrogen was found to support new growth as evidenced by N-15 enrichment of new leaves. This study indicates that common reed beds in the littoral zone may play an important role in retention of sedimented planktonic materials. (c) 2009 Elsevier Ltd. All rights reserved.