水生态学杂志2017，Vol.38Issue(1)：30-34,5.DOI:10.15928/j.1674-3075.2017.01.005
穗花狐尾藻在不同营养水平湖泊繁殖策略的比较研究
Reproductive Strategies of Myriophyllum spicatum in Eutrophic and Oligotrophic Lakes:a Comparative Study
摘要
Abstract
Macrophytes play an important role in the health of lake ecosystems, especially in eutrophic lakes. Mac-rophytes are able to adjust the allocation of different reproductive components to adapt to environmental conditions. Recently, with increased eutrophication of shallow lakes, the loss of macrophytes has become common around the world, although macrophytes do survive in eutrophic lakes. The resource allocation pattern among the different re-productive components of macrophytes may provide a means for understanding the adaptation to highly eutrophic conditions. The widespread macrophyte species, Myriophyllum spicatum, was selected for study and resource allo-cation among different reproductive components was measured in order to gain insight on how this species adapts to eutrophic conditions. The investigation was carried out in Xingyun Lake ( eutrophic) and Fuxian Lake ( oligotro-phic) in Yunnan Province. Six sampling sites for each lake were selected and 10 M. spicatum plants at a depth of 1. 5 m were collected from each site. After drying, the plants were divided into sexual parts (flower, fruit and in-florescence) and asexual parts ( branch, stem, leaf and root) and the biomass of each group was measured. Two way ANOVA was conducted to compare differences in total biomass and relative biomass of sexual and asexual plant parts, between lakes and among sampling sites. The highest and lowest sexual biomasses of M. spicatum in Fuxian Lake were 0. 071 g and 0. 054 g, and the highest and lowest absolute asexual biomasses were 1. 519 g and 1. 157 g. In Xingyun Lake, the highest and lowest values of sexual biomasses were 0. 127 g and 0. 107 g, and 1. 031 and 0. 955 g for asexual biomass. The ratio of biomass allocations shows that sexual reproduction of M. spi-catum in Fuxian Lake was 3 . 65% -5 . 59% and asexual ( clonal ) reproduction was 94 . 41% -96 . 35%. In Xingyun Lake, sexual reproduction was 9. 71% -11. 61% and asexual reproduction was 88. 39% -90. 29%. These results indicate that M. Spicatum allocates more resource to sexual reproduction in eutrophic lakes ( Xingyun Lake) than in oligotrophic lakes ( Fuxian Lake) .关键词
营养水平/繁殖策略/穗花狐尾藻Key words
trophic status/reproductive strategy/Myriophyllum spicatum分类
农业科技引用本文复制引用
吴业颖,操瑜,郑志伟,张志永,王文君,刘帆..穗花狐尾藻在不同营养水平湖泊繁殖策略的比较研究[J].水生态学杂志,2017,38(1):30-34,5.基金项目
国家自然科学基金面上项目( 31370262 )和青年基金项目(31500296),三峡后续工作科研项目(2013HXKY2-3),中国水利水电建设集团科研项目( AG2012/S-46-D). （ 31370262 ）
