Response of Exotic Invasive Weed Alternanthera philoxeroides to 
Environmental Factors and Its Competition with Rice

Abstract

Abstract: A greenhouse experiment was conducted to determine the influence of the environmental factors such as low-temperature, drought stress, salt-alkali and flooding on the survival rate, propagation rate, fresh biomass and viability of the Alternanthera philoxeroides and its competitive ability against rice by using bioassay method. A high viability of 84% was found when the stems were treated at 4℃ and then grew under normal conditions, while no viable plant was noted when the stems were treated at -20℃ and grew under normal conditions. Compared to the fresh stem with water content of 93.5%, the survival rate, number of propagated stems and fresh biomass of A. philoxeroides derived from the stems with water content of 30.2% were reduced by 45%, 33% and 74% respectively. The treatments of 0.1% salt-alkaline solution led to loss of viability of A. philoxeroides. The stems of A.
philoxeroides could grow in wet soil with different depths of water-layer. The A. philoxeroides at density of 23-180 plants/m2 reduced
the rice grain yield by 43-50% at the rice plant density of 100 plants/m2.

Key words: Alternanthera philoxeroides, hydrophytic type, environmental factor, rice, viability, competitive ability

YU Liu-qing, Yoshiharu FUJII , ZHOU Yong-jun, ZHANG Jian-ping, LU Yong-liang, XUAN Song-nan. Response of Exotic Invasive Weed Alternanthera philoxeroides to
Environmental Factors and Its Competition with Rice[J]. RICE SCIENCE, 2007, 14(1): 49-55 .

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