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The edge effect of forest communities in Kunyu Mountain Nature Reserve of China due to two small-scale roads was studied. By setting 3 groups of sample plots: sample plot beside 2.5 m road corridor, sample plot beside 5.0 m road corridor and sample plot in wildwood area, forest investigation was carried out using typical sampling method to evaluate and reveal the influence of edge effect (caused by 2.5 m and 5.0 m scenic road corridor) on the community structure, species composition and diversity of plants in Kunyu mountain national nature reserve. Results show (1) that compared with wildwood area, the average DBH (diameter at breast height) of tree layer at 2.5 m and 5.0 m scenic road corridor in Kunyu mountain national nature reserve decreases with the increase of width of road corridor. In shrub layer, edge effect is balanced by increasing the number of low-diameter shrubs while decreasing the number of high-diameter shrubs. It is worth noting that the edge effect of 2.5 m scenic road corridor is significantly higher than that of 5.0 m scenic road corridor. (2) In tree layer, the four indexes all showed as follows: sample plot near 5.0 m scenic road corridor was significantly higher than the sample plot near 2.5 m scenic road corridor and wildwood area. In shrub layer, the four indexes abovementioned can be ranked as sample plot near 5.0 m scenic road corridor>sample plot near 2.5 m scenic road corridor>wildwood area. In herb layer, the 4 indexes are ranked as sample plot near 5.0 m scenic road corridor>wildwood area>sample plot near 2.5 m scenic road corridor. Main conclusion: The 2.5 m scenic road corridor exerts an inhibition effect on the species composition and diversity of plants in Kunyu mountain national nature reserve, however, 5.0 m scenic road corridor has a promoting effect.

INFLUENCE OF SCENIC ROAD CORRIDOR ON PLANT DIVERSITY IN KUNYU MOUNTAIN, CHINA