| 澜沧江干流（中国境内）2011年夏季浮游植物群落结构特征 |
| Phytoplankton Community Structure in the Main Channel of Lancang River (Territory of China) in Summer, 2011 |
| 投稿时间：2014-05-04 修订日期：2014-09-12 |
| DOI： |
| 中文关键词:浮游植物 群落结构 澜沧江 夏季 |
| 英文关键词:phytoplankton community structure Lancang River summer |
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| 中文摘要: |
| 为了解澜沧江干流（中国境内）浮游植物的种类、密度、生物量，分析其种类组成、现存量、多样性指数等群落特征指数与生态分布特点，2011年5月28日至7月14日，根据其流域特点，在干流从上游至下游共布设21个采样点进行了浮游植物调查。结果显示，浮游植物有104种，以硅藻门和绿藻门为主；其中，硅藻门72种，占检出种类的69.23%；绿藻门15种，占14.43%；蓝藻门11种，占10.58%；甲藻门和金藻门各2种，分别占1.92%；裸藻门和红藻门各1种，分别占0.96%。澜沧江干流夏季浮游植物密度为202800～950640 个/L，平均密度为415171个/L，小湾库区的浮游植物密度最高，旧州最低；浮游植物生物量为0.33～0.87 mg/L，平均生物量为0.59 mg/L，漫湾库区的生物量最高，橄榄坝最低；硅藻门密度和生物量最高，占总密度的90.77%和总生物量的68.86%。澜沧江干流夏季浮游植物多样性指数为0.59～3.31，糯扎渡采样点的多样性指数最高，小湾最低；均匀度指数为0.12～0.65，糯扎渡采样点均匀度指数最高，小湾最低；物种丰富度指数为0.48～3.18，旧州采样点的物种丰富度指数最高，糯扎渡最低。 |
| 英文摘要: |
| In this study we characterized the phytoplankton density, biomass and species composition of the main stream of the Lancang River (territory of China), and analyzed the distribution, standing stock and diversity index of the phytoplankton community, which provides basic data for the investigation and analysis of the aquatic ecological environment in this region. From May, 28 to July, 14 of 2011, the investigation was conducted at 21 sample sites from upstream to downstream of the Lancang River. Phytoplankton for qualitative analysis was collected with a No.25 plankton net and 2000mL water sample for quantitative analysis were collected 0.5m below the water surface and concentrated to 30ml after 48h settling for subsequent identification and counting under a microscope. A total of 104 species belonging to 7 phyla were identified. Among them, Bacillariophyta dominated, with 72 species and accounting for 69.23% of the total phytoplankton species, followed by Chlorophyta (15) and Cyanophyta (11), accounting for 14.43% and 10.58%, respectively. However, only two species in each phylum of Pyrrophyta and Chrysophyta, one species of Euglenophyta and Rhodophyta were observed during the survey. The species composition of the phytoplankton community in the Lancang River reflected the characteristics of a natural river’s phytoplankton community, dominated by Bacillariophyta which prefer flowing water. Phytoplankton density and biomass were in the range of 202,800-950,640 ind./L and 0.33-0.87 mg/L, with average values of 415,171 ind./L and 0.59 mg/L, respectively. The highest density and biomass were both in Bacillariophyta, accounting for 90.77% and 68.86% of the total density and biomass. With respect to spatial distribution, the highest density was found in the Xiaowan Reservoir area and the lowest in Jiuzhou; the highest biomass was recorded in Manwan Reservoir area and the lowest in Ganlanba. The density and biomass of the phytoplankton community were higher in reservoir areas as a result of environmental changes caused by the construction of reservoirs on the middle and lower reaches of the Lancang River. During summer, the diversity index, evenness index and the richness index of the phytoplankton community in the Lancang River varied, respectively, from 0.59 to 3.31, from 0.12 to 0.65 and from 0.48 to 3.18. The highest diversity index and evenness index were both observed in Nuozadu and the lowest were both observed in Xiaowan Reservoir. The highest richness index was found in Jiuzhou and the lowest in Nuozhadu. Statistical analysis, carried out using SPSS 17.0, indicate significant differences between the upper, middle and lower reaches of Lancang River in terms of species richness (t=17.96，P<0.01), average phytoplankton density (t=8.79，0.01
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| 雷欢,憨雪莹,谢文星,黄道明,常秀岭.2014.澜沧江干流（中国境内）2011年夏季浮游植物群落结构特征[J].水生态学杂志,35(6):67-74. |
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