Combining biogeographic approaches to advance invasion ecology and methodology

1) Understanding the causes of plant invasions requires that parallel field studies are conducted in the native and introduced ranges to elucidate how biogeographic shifts alter the individual performance, population success, and community-level impacts of invading plants. Three primary methods deployed in in situ biogeographic studies are directed surveys, where researchers seek out populations of target species, randomized surveys, and field experiments. Despite the importance of these approaches for advancing biogeographic research, their relative merits have not been evaluated. 2) We concurrently deployed directed surveys, randomized surveys, and in situ field experiments for studying six grassland plant species in the native and introduced ranges. Metrics included plant size, fecundity, recruitment, abundance, and invader impact, as well as soil properties and root associations with putative fungal mutualists and pathogens. 3) Consistent with key invasion hypotheses, Bromus tectoru...1) 解析植物入侵的成因，需同步在本土分布区与引种分布区开展野外研究，以阐明生物地理分布变迁如何改变入侵植物的个体表现、种群存续能力以及群落层面的影响。原位生物地理研究主要采用三类方法：定向调查（即研究者靶向搜寻目标物种种群）、随机调查，以及野外实验。尽管上述方法对推动生物地理研究至关重要，但目前尚未有研究对其相对优劣进行评估。 2) 本研究同时针对本土与引种分布区的6种草本植物，采用定向调查、随机调查与原位野外实验开展入侵相关研究。采集的观测指标包括植物体型、繁殖力、种群补充率、种群丰度以及入侵影响，同时还测定了土壤性质与根系和推测的真菌共生体、病原菌的关联情况。 3) 本研究结果与核心入侵假说相符，旱雀麦（Bromus tectorum）……