Invasive Plant Species Distribution

Diversity 2022, 14, 167 27° N 29° N 25° N 27° N 105° E (a) Solanum quitoense 11 of 16 inconsistent for different types of roads (Table 3). The invasion intensity-environmental factors correlation was weak for locally invasive plants, generally invasive plants, and invasive plants requiring further investigations (Table 3). Guiyang 108° E Zunyi Tongren Qiandongnan ansl Anshum Qiannan Orakinan ⚫ Detected 0 25 50 Km L • Undetected 105° E 108° E 105° E (c) Crepis tectorum Guiyang, 108° E Zenyi Tongfen Qiandongnan Pansu Anshun Qiannan 105° E Qaxinan Detected 0 25 50 Km • Undetected 108°E 25° N 25° N 29° N 25° N 105° E (b) Axonopus compressus Guiyang 108° E nyi •Tongren Qiandongnan pansan Anshum Qiannan (d) Others 105° E 105° E 105° E Qraxinan 0 25 50 Km 108°E 108° E • Detected Undetected Zenyi Tongren Guiyang Anshum Qiannan 0 Qiandongnan Qnxinan ⚫ Detected 0 25 50 Km • Undetected 108 E N Z 29 Figure 6. Distribution of invasive plants requiring further investigations (Level 5). Red and indicate detected and undetected invasive species, respectively. grey dots Table 3. Pearson's correction coefficients between plant invasion intensity and environmental factors. * indicates significant correlation at the level of 0.05. Invasive Level Elevation Precipitation Temperature SOC Distance to Railways Distance to Expressways Distance to National Roads Distance to Country Roads 1 -0.24* 0.30 * 0.39* 0.18* 0.14* 0.03 0.18* 0.01 Number of 2 0.38 * -0.33* -0.44* -0.11 * -0.06 0.16* 0.01 -0.16* Invasive 3 0.11* -0.02 -0.08 0.00 0.00 -0.01 0.21 * -0.08 Species 4 -0.01 0.02 0.02 0.00 -0.10 -0.07 -0.04 0.03 5 0.05 0.04 -0.01 -0.06 0.01 -0.08 -0.01 0.04 1 -0.15* 0.22* 0.26* 0.14* 0.09 0.00 0.08 0.06 Biomass of 2 0.23 * -0.23* -0.25* -0.07 0.04 0.05 -0.04 -0.11* Invasive 3 0.03 -0.03 -0.02 -0.03 -0.04 0.03 0.10 Species 4 0.00 0.01 0.00 0.09 -0.09 -0.08 -0.08 5 0.04 0.07 0.02 -0.05 -0.02 -0.07 0.02 -0.03 0.03 -0.06 Regarding the malignant invasive species, there were significant negative correlations between invasion intensity and plant cover and biomass, but these correlations were not significant for number of species and plant height (Table 4). There also was a significant positive correlation between the invasion intensity of seriously invasive species and number of species, and a negative correlation for plant height, but these correlations were not significant for plant cover and biomass (Table 4). There was a trend toward negative

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