| 宋玉芝,杨 旻,杨美玖,赵淑颖,王 敏.氨氮浓度对附植藻类在菹草上定植及演替的影响[J].农业环境科学学报,2014,33(2):375-382. |
| 氨氮浓度对附植藻类在菹草上定植及演替的影响 |
| Response of Colonization and Community Succession of Epiphytic Algae on Potamogeton Crispus L. to Ammonia Loads |
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| DOI：10.11654/jaes.2014.02.024 |
| 中文关键词: 氨氮浓度 附植藻类 优势种 菹草 |
| 英文关键词: ammonia nitrogen epiphytic algae dominant species Potamogeton crispus L. |
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| 中文摘要: |
| 为了更好地认识附植藻类群落在水体富营养化过程中的定植及群落演替规律，利用显微计数法，通过室内静态模拟实验，研究了水体不同氨氮水平对太湖常见沉水植物菹草上附植藻类的影响。结果表明：附植藻类在不同氨氮浓度下建群速度和时间是不同的，并且不同的氨氮浓度会改变附植藻类的群落结构，最终演变成低浓度下以硅藻门为绝对优势种，高浓度下以绿藻门为优势种的局势；某些附植藻类只在特定的氨氮环境下表现出优势，如绿藻门的新月藻只在1.5 mg·L-1的低浓度组和5 mg·L-1的高浓度组才表现出优势，而硅藻门的针杆藻只在2.5 mg·L-1的中浓度组表现出优势；低浓度范围内营养盐的增加会促进附植藻类生物量的积累，但过高则会抑制生物量；中等浓度的氨氮营养盐中附植藻类的生物量最大，此时的种类也最多。该研究表明氨氮营养盐对附植藻类的群落演替影响显著，附植藻类或许是沉水植物衰退的一个重要因素。 |
| 英文摘要: |
| To better understand colonization process and community succession of epiphytic algae during the water eutrophication, a static incubation experiment and macroscopic counting method were used to investigate the effects of increasing ammonia loads on epiphytic algae attaching to common submerged macrophyte Potamogeton Crispus L. of Taihu. The results showed that colonization process and community composition of epiphytic algae varied with ammonia levels. The climax succession showed that Bacillariophyta was dominated at low ammonia concentrations and Chlorophyta prevalent at high ammonia concentrations in epiphytic algae assembly. In addition, some dominant species of epiphytic algae only appeared in specific ammonia concentrations. For example, Closterium of Chlorophyta appeared as dominant species only at ammonia concentrations of 1.5 mg·L-1 and 5.0 mg·L-1, while Synedra of Bacillariophyta appeared only at ammonia concentration of 2.5 mg·L-1. The epiphytic algae biomass also showed variation with ammonia loads. When ammonia concentrations were lower（≤1.5 mg·L-1）, epiphytic algae biomass increased with increasing ammonia concentrations, but was inhibited when the concentrations were higher（≥5 mg·L-1）. The maximum biomass and highest species richness of epiphytic algae were observed at the medium ammonia concentration（ 2.5 mg·L-1, group C）. The results indicate that ammonia concentrations have significant effects on the community colonization and succession of epiphytic algae and epiphytic algae may cause the decline of submerged macrophyte. |
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