The construction, use, and maintenance of terrestrial transport corridors [roads and railroads (TTCs)] facilitate the spread of invasive plants, but the distances at which plants typically spread away from TTCs, and how that process is mediated by landscape context, is not well understood. We compiled data on the number of invasive plant species per ~ 672 m² plot (= invasive richness) from 44,000 + forest inventory plots in the eastern USA. Using a generalized linear model framework, we investigated how invasive richness is influenced by distance from the nearest TTC, surrounding land use type, and ecological province. Invasive richness in forests decreased as distance from the nearest TTC increased. Directly adjacent to TTCs, there were an estimated 1.4 ± 0.01 SE invasive plant species per plot compared to 0.8 ± 0.01 and 0.2 ± 0.01 species at 1 and 3 km, respectively, away from the nearest TTC. Invasive richness was highest on plots associated with a combination of agriculture/development (2.1 ± 0.03 species per plot) and in the Midwest Broadleaf Forest province (2.1 ± 0.06). Our macroscale analysis also demonstrated that rates of decay in invasive richness away from TTCs were mediated by the types of land use and ecological provinces within which plots were located. The influences of TTCs and associated activities (e.g., construction, travel) on invasive plant richness were widespread across forests of the eastern USA, but the relative importance of TTCs for facilitating spread appears to be highly context dependent.

地面运输走廊[公路和铁路（TTC）]的建设，使用和维护有助于入侵植物的传播，但是植物通常远离TTC传播的距离以及景观环境如何介导该过程并没有完全了解。我们汇总了每〜672 m ²的入侵植物数量的数据美国东部的44,000多个森林清查地块中的地块（=侵入性丰富度）。使用广义线性模型框架，我们研究了到最近的TTC的距离，周围土地利用类型和生态省如何影响侵入性丰富度。随着距最近的TTC的距离增加，森林中的入侵性丰富度降低。与TTC直接相邻，每块地估计有1.4±0.01 SE入侵植物，而距最近的TTC分别在1公里和3公里处分别有0.8±0.01和0.2±0.01种。在与农业/发展相结合的地块（每块地2.1±0.03种）和中西部阔叶林省（2.1±0.06）上，入侵性丰富度最高。我们的宏观分析还表明，远离TTC的侵略性丰富度的下降速率是由土地使用类型和地块所在的生态省介导的。TTC及其相关活动（例如建筑，旅行）对入侵性植物丰富性的影响在美国东部的森林中普遍存在，但是TTC在促进传播方面的相对重要性似乎高度依赖于上下文。