ROADLESS HABITATS AS REFUGES FOR NATIVE GRASSLANDS: INTERACTIONS WITH SOIL, ASPECT, AND GRAZING

By Jonathan L. Gelbard, S. Harrison. 2003

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The spatial spread of invasions: new developments in theory and evidence (2004, background): “Gelbard & Harrison (2003) found that Californian grasslands 1000 m from the nearest road had a significantly lower percentage of alien individuals than sites that were 100 or 10 m from the nearest road: environmental differences could not explain this effect.”
Plant invasion across space and time: factors affecting nonindigenous species success during four stages of invasion. (2007, background): “…conducted at landscape scales often reveal correlations between the distance to disturbance corridors and NIPS presence or abundance (Timmens & Williams, 1991; D’Antonio et al., 2000; Parendes & Jones, 2000; Rubino et al., 2002; Gelbard & Harrison, 2003; Watkins et al., 2003; Searcy et al., 2006).”
Effects of roads and forest successional age on experimental plant invasions (2009, background): “Correspondingly, sites far from roads may be resistant to invasions due to different abiotic conditions such as reduced disturbance frequency or resource availability (Gelbard and Harrison, 2003).”