水生植物对水塘水质影响的实例研究

A Case Study of Impact of Aquatic Plants on Pond Water Quality

水生植物在调节水塘水质方面发挥着重要作用。为揭示水生植物对水塘水质的影响,选取扬州大学江阳路南校区水塘为研究区,对该水塘水生植物区和无水生植物区水质参数水温(WT)、pH、溶解氧(DO)、电导率(EC)进行观测,采用变异系数法、单因子水质标识指数法及多元线性回归模型对各水质参数的变化特性进行分析,评价水生植物对水质的影响。结果表明:①观测期间内水生植物区WT、DO均低于同期无水生植物区;②水体呈碱性,无水生植物区的pH普遍高于水生植物区;③无水生植物区各水质参数的波动程度多高于同期水生植物区,两区域各水质参数变异性权重由高到低依次为DO>WT>EC>pH;④无水生植物区水质优于水生植物区,无水生植物区DO达III类水质要求时段占总时段的67.7%;⑤研究期间内,无水生植物区和水生植物区WT对DO的影响不一致,Phyco及pH的变化对DO浓度的影响相对于WT大。

Aquatic plants play an important role in regulating the water quality of ponds.To reveal the effects of the aquatic plants on pond water quality,taking a specified pond,which is located inside the Jiangyanglu South Campus of Yangzhou University,as the study area,this paper observes the water quality parameters such as phycobilin chromophore(Phyco),water temperature(WT),dissolved oxygen(DO),pH and electrical conductivity(EC)of pond areas with aquatic plants or without aquatic plants,analyzes the temporal variation characteristics of each water quality parameter by the methods of coefficient of variation,single factor water quality identification index and multiple linear regression model,and evaluates the effects of the aquatic plants on water quality.The results indicate that:①WT,DO of the aquatic plant area are lower than those of the non-aquatic plant area during the research period;②The water is alkaline,and the pH of the non-aquatic plant areas is generally higher than that of aquatic plan area;③The fluctuation degree of each parameter in the non-aquatic plant area is larger than that of the aquatic plant area in the same period,and the variation weight of water quality parameters in the two areas from high to low is DO>WT>EC>pH;④The time for water quality in the non-aquatic plant area reaching ClassⅢaccounts for 67.7%of the research period,and the water quality of the non-aquatic plant area is better than that of the aquatic plant area;⑤During the study period,the impact of WT on DO in the non-aquatic plant area and the aquatic plant area was inconsistent,while the impact of Phyco and pH on DO is more significant than that of WT.