1. Response of Exotic Invasive Weed Alternanthera philoxeroides to Environmental Factors and Its Competition with Rice
- Author
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Yoshiharu Fujii, Song-nan Xuan, Yong-liang Lu, Yu LiuQing, Jian-ping Zhang, and Yong-jun Zhou
- Subjects
competitive ability ,media_common.quotation_subject ,Biomass ,hydrophytic type ,Plant Science ,lcsh:Plant culture ,medicine.disease_cause ,Competition (biology) ,Alternanthera philoxeroides ,environmental factor ,medicine ,Bioassay ,lcsh:SB1-1110 ,Water content ,media_common ,biology ,rice ,viability ,Environmental factor ,food and beverages ,biology.organism_classification ,Salinity ,Agronomy ,Weed ,Agronomy and Crop Science ,Biotechnology - Abstract
s: 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/m 2 reduced the rice grain yield by 43-50% at the rice plant density of 100 plants/m 2 .
- Published
- 2007