| 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 |
| 投稿时间：2015-12-15 修订日期：2016-11-25 |
| DOI：10.15928/j.1674-3075.2017.01.005 |
| 中文关键词:营养水平 繁殖策略 穗花狐尾藻 |
| 英文关键词:trophic status reproductive strategy Myriophyllum spicatum |
| 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），安谷水电站对大渡河下游水生生物的长期生态效应研究（AG2012/S-46-D） |
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| 中文摘要: |
| 研究资源在植物不同繁殖组分间的分配，初步了解水生植物在繁殖策略上适应富营养化的机制。试验地点为富营养化的星云湖和贫营养化的抚仙湖，各设置6个采样点，每个采样点在1.5m水深处收集穗花狐尾藻10株，分为有性繁殖组分和无性繁殖组分，利用双因素方差分析比较穗花狐尾藻有性繁殖和无性繁殖的绝对生物量和相对生物量在不同采样点、不同营养化湖泊间的差异。穗花狐尾藻在抚仙湖有性繁殖的绝对生物量最高0.071g、最低0.054g，无性繁殖绝对生物量最高1.519g、最低1.157g；在星云湖有性繁殖的绝对生物量最高0.127g、最低0.107g，无性繁殖绝对生物量最高1.031g、最低0.955。穗花狐尾藻在抚仙湖有性繁殖的比例最高为5.59%、最低为3.65%，无性繁殖比例最高为96.35%、最低为94.41%；在星云湖有性繁殖的比例最高为11.61%、最低为9.71%，无性繁殖最高为90.29%、最低为88.39%。穗花狐尾藻在富营养化湖泊星云湖将更多的资源投入到了有性繁殖，而在贫营养化湖泊抚仙湖则将更多的资源投入到无性繁殖。 |
| 英文摘要: |
| Macrophytes play an important role in the health of lake ecosystems, especially in eutrophic lakes. Macrophytes 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 reproductive 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 allocation 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 (oligotrophic) in Yunnan Province. Six sampling sites for each lake were selected and 10 M. spicatum plants at a depth of 1.5m were collected from each site. After drying, the plants were divided into sexual parts (flower, fruit and inflorescence) 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 0.071g and 0.054g, and the highest and lowest absolute asexual biomasses were 1.519g and 1.157g. In Xingyun Lake, the highest and lowest values of sexual biomasses were 0.127g and 0.107g, and 1.031 and 0.955g for asexual biomass. The ratio of biomass allocations shows that sexual reproduction of M. spicatum 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). |
| 吴业颖,操瑜,郑志伟,张志永,刘 帆,王文君.2017.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,38(1):30-34. |
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