Correlation study of Submerged Macrophytes Growth and Environmental Factors in Lake Qionghai Wetland

Abstract

The characteristics of submerged macrophytes communities, water environment factors and substrate environmental factors of Lake Qionghai wetland were investigated in April 2018 by laying out 21 sample points. A total of 8 submerged macrophytes species were recorded in the 21 sample points. Myriophyllum spicatum, Vallisneria natans, Ceratophyllum demersum, and Potamogeton malaianus were the main submerged macrophytes species in Lake Qionghai wetland. The depth of submerged macrophytes was less than 2m, and submerged plants were found in most areas of lakeside zone. Submerged macrophytes had a strong adaptability to substrate, it could grow in artificial stacked group rocks, natural lakeside stone sand, natural alluvial river sand, loess and silt, etc, but the substrate with high nutrition was more favorable to the growth of submerged macrophytes than the substrate with low nutrition. Water nutrients, bottom nutrients and water depth are the decisive factors affecting the growth of submerged macrophytes, while transparency, chemical oxygen demand, light, temperature, water flow and pH are the decisive factors affecting the survival of submerged macrophytes.