摘要：Giant salvinia (Salvinia molesta D.S. Mitchell), a native of South America, is an invasive floating aquatic fern. Previous studies have reported that growth of S. molesta is dependent on dissolved nutrients in the water and that the plant achieves maximum biomass in circumneutral to slightly acidic water. We examined giant salvinia growth in a three-by-three factorial experiment, with pH levels of 5, 6.5, and 8 and low (no addition), medium (9.0 mg I -1 N and 4.5 mg L -1 P), and high (13.5 mg L -1 N and 6.7 mg L -1 P) concentrations of added nutrients. Results indicate that pH was not a significant factor affecting S. molesta biomass (p = 0.10) after 84 days, while nutrient level significantly affected growth (p < 0.01). Water pH was a significant (p = 0.04) factor influencing S. rnolesta growth after 14 days. While pH may not be a factor controlling the long-term growth of S. molesta, it is important during the early stages of colonization and growth in providing an optimal growing environment. Salvinia molesta will likely succeed best in waters with high nutrient loading rates, and it may not survive or compete in waters that are limited in nutrients.
