Based on the investigation of submerged macrophytes and its relational environmental factors in June, 2010, Lake Chaohu, this paper analyzed the characteristics of submerged macrophyte community and distribution, discussed the relationship between submerged macrophytes and environmental factors with redundancy analysis. The results showed that there were 6 submerged macrophyte species in 5 families, 4 genera. Total biomass of submerged macrophytes was about 8077.8t and their total distribution area was just 1.54％ of the whole lake area. Potarnogeton malaianus was the dominant species, which occupied 90.7％ of the total distribution area of submerged macrophytes. Ceratophyllum demersura Linn. , Myriophyllurn spicatum Lian. and Hydrilla verticillata( Linn. f. ) Royle appeared rarely and had been at the verge of extinction. Monte Carlo test results showed that the correlation between TP, PO34 - -P, COD, SD, depth of water and the distribution of submerged macrophyte community was significant, however, TN had no significant effect, which suggesting that the distribution of submerged macrophyte community was more limited by P than N. The results also showed that the correlation between TN and TP of sediment and the distribution of submerged macrophyte community were not significant, while the influence of sediment TOC on the distribution of submerged macrophyte community was significant.%在对巢湖2010年沉水植物和环境因子调查的基础上,分析了巢湖沉水植物群落特征、分布规律,应用冗余分析探讨了沉水植物与环境因子之间的关系.结果表明,现场观测到的沉水植物共计4科5属6种,全湖生物量约为8077.8t,分布面积仅占巢湖总面积的1.54%.其中马来眼子菜(Potamogeton malaianus Miq.)分布面积占沉水植物分布总面积的90.7%,是巢湖沉水植物中绝对优势种.金鱼藻(Ceratophyllum demersum Linn.)、穗花狐尾藻(Myriophyllum spicatum Linn.)和轮叶黑藻(Hydrilla verticillata(Linn.f.)Royle)等沉水植物稀少,已濒临消失.Monte Carlo测试检验的结果表明,水体总磷、正磷酸盐、化学需氧量、透明度和水深等与沉水植物群落分布的相关性极显著,但是水体总氮的影响并没有达到显著水平,说明巢湖流域沉水植物的群落分布受磷的限制要大于氮.检验结果还表明底泥的总氮和总磷与沉水植物的分布没有很好的相关性,而底泥总有机碳的影响达到了极显著水平.
展开▼
