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

Rice science 2007年第1期14卷 49-55页

作者： YU Liu-qing Yoshiharu FUJII ZHOU Yong-jun ZHANG Jian-ping Lu Yong-liang XUAN Song-nan State Key Laboratory of Rice Biology China National Rice Research Institute Hangzhou 310006 China National Institute for Agro-Environmental Science Tsukuba Ibaraki 305-8604 Japan

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 altemanthera 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/m^2 reduced the rice grain yield by 43-50% at the rice plant density of 100 plants/m^2.

关键词： altemanthera philoxeroides hydrophytic type environmental factor rice viability competitive ability

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