Control of overgrowth of Potamogeton crispus in shallow lakes by light shading and artificial introductions

• DOI: 10.1016/j.eti.2024.103641
• Publication Date: 2024-04-17T16:53:03Z
• Authors: Qi Zhu; Ruiwen Zheng; Lingquan Zeng; Chunhua Li; Chun Ye; Dandan Liu
• Keywords: Potamogeton crispus; Ceratophyllum demersum; Light intensity; Hydrilla; Potamogeton

Potamogeton crispus is a common submersed aquatic plant in shallow lakes China, and its overgrowth rapid decomposing have become an important environmental problem affecting the water quality of every summer. Introducing other plants to substitute can improve structure community reduce growth some degree, but effect poor short-lived. Considering fact that sensitive changes light intensity, two methods shading surface introduction submerged were used synergistically. In large simulated experimental pool, intensity was reduced by placing black polyethylene floating spheres on planting three species plants, namely, Vallisneria natans, Hydrilla verticillata wrightii. Changes physico-chemical properties pool physiological biochemical characteristics (morphology, chlorophyll, biomass, antioxidant enzymes malondialdehyde) during period 0-40 d analyzed. The results showed that: (1) After 85%, seedlings significant decrease biomass chlorophyll content died numbers within 20 30 days. (2) Catalase main tool for cope with low stress. activities various malondialdehyde decreasing trend under shade conditions, catalase activity increased dramatically. (3) natans more tolerant conditions than species. Therefore, we tried combing treatment. (4) objectives remained stable over trial, indicating short-term does not negative impact quality.