关键词: 沉水植物, 菹草, 引水渠, 水生生态

Abstract: The over-growth of Potamogeton crispus in Jing-mi canal has resulted in the obstruction of water flow during recent years. Using approaches of laboratary experiment and field investigation, P.cripspus is a kind of submerged macrophyte, its ecological habits, development stages and population dynamics has been carried on in this paper. P.cripspus has a natural inclination for low water temperature. The phrase of turion over summer and germling over winter are two specific property of the life history of P.crispus. It grows expeonentially in later spring and early summer, making its biomass accumalation curve in S shape. P.crispus happens in every section of Jing-mi Canal, and grows best in the lower reaches of the Canal during May and June, where the water is on meso-eutroficational state. The manage measures and optimum time of controlling P.crispus are mentioned in this paper.

Key words: submerged macrophyte, potamogeton crispus, canal, aqutic ecology