Polygonum cuspidatum Sieb. & Zucc. (=Fallopia japonica (Houtt. Dcne.) (草本植物, 灌木)

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一般影响 虎杖对河岸地和开阔地是一大威胁，会快速生长形成密集群落，排挤原生植群，使其难以复原。这会降低物种多样性，并改变野生物的栖地。一旦建立稳定族群，便难以移除。          地点特有的影响： France   与其它入侵物种相互作用: The hybrid Fallopia X bohemica is common in France, produced by crosses of Fallopia japonica and F. sachalinensis. 农业: Blockages in rivers caused by F. japonica impacts on irrigation to fields. 改变水文: F. japonica contributes to the erosion of riverbanks and causes blockages to rivers in autumn when dry stems are carried by the current. 改变演化模式: F. japonica disturbs the natural regeneration of alluvial forests (alders, willows, ashes). United States (USA)   其它: Its early emergence and great height combine to shade out other vegetation and prohibit regeneration of other species (Sukopp and Sukopp 1988, in Seiger, 1991). Thus, it reduces species diversity and damages wildlife habitat (Palmer 1990, Scott and Mars 1984, Wiegman pers. comm., in Seiger, 1991). 改变演化模式: It is a dominant pioneer in the primary succession of volcanic slopes and is frequently a coloniser in secondary succession (Hirose, 1984, in Seiger, 1991). 改变营养机制: Seiger (1991) states that it contributes to the development of the ecosystem, in part, by acting as a nutrient reservoir. 竞争: Remaley (1997) states that it spreads quickly to form dense thickets that exclude native vegetation and greatly alter natural ecosystems.