Response of Exotic Invasive Weed Alternanthera philoxeroides to Environmental Factors and Its Competition with Rice |
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Authors: | YU Liu-qing Yoshiharu FUJII ZHOU Yong-jun ZHANG Jian-ping LU Yong-liang XUAN Song-nan |
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Institution: | 1. State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou 310006, China;2. National Institute forAgro-Environmental Science, Tsukuba, Ibaraki, 305-8604 Japan |
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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°C and then grew under normal conditions, while no viable plant was noted when the stems were treated at -20°C 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. |
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Keywords: | Alternanthera philoxeroides hydrophytic type environmental factor rice viability competitive ability |
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