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Scientia Silvae Sinicae ›› 2020, Vol. 56 ›› Issue (4): 197-208.doi: 10.11707/j.1001-7488.20200422

• Scientific notes • Previous Articles    

Applicability of the United States Weed Risk Assessment System to Invasive Plants in China

Shanyong He1,Fei Xu2,Ning Zhang2,Junbao Wen1,*,Liping Yin2   

  1. 1. Beijing Key Laboratory for Forest Pests Control, Beijing Forestry University Beijing 100083
    2. Shanghai Customs District People's Republic of China Shanghai 200135
  • Received:2018-10-10 Online:2020-04-25 Published:2020-05-29
  • Contact: Junbao Wen

Abstract:

Objective: In this study,a priori category of alien plants in China was used to test the assessment effect by the United States weed risk assessment system (USWRA),and the paper further analyzed whether USWRA could be applicable to the quarantine management of forest plants in China,in order to lay a foundation for the establishment of risk assessment methods for invasive plants in China. Method: In this paper,131 alien plants (including 76 non-invasive plants and 55 invasive plants) with a priori category in China were selected and tested with USWRA. The evaluation outcome of USWRA was analyzed through comparing the predictive categories of the tested plants evaluated by USWRA with the known categories,and the outcome was tested using the ROC curve. In addition,the proportion difference of invasive plants in different life forms was analyzed by Friedman test and Nemenyi method. One-way ANOVA and LSD multiple comparison methods were used to analyze the differences in risk scores among different life forms of plants. Result: For major invasive plants,USWRA correctly rejected 68.4% of them,and did not wrongly accept single one,and the remaining 31.6% needed to be evaluated further. For non-invasive plants,USWRA correctly accepted 84.2% of them,and did not wrongly reject single one,and the remaining 15.8% needed to be evaluated further. For minor invasive plants,USWRA rejected 27.8% of them,accepted 5.6% of them,and the remaining 66.7% needed to be evaluated further. The ROC curve test results showed that USWRA had a high ability to distinguish major invasive plants from non-invasive plants with a curved AUC value up to 0.990. In addition,there were significant differences in risk scores to become invasive plants among different life forms,and the risk scores of herbaceous and vine plants were significantly higher than those of arbor plants. There were significant differences in the proportion of invasive plants in different life forms,and the risk of herbaceous and vine-like plants becoming invasive plants was greater than that of tree plants. Conclusion: USWRA can satisfactorily discriminate major invasive plants from non-invasive plants without any error,and thus it can be applied the quarantine management of forest plants in China.

Key words: invasive alienplant, weed, weed risk assessment, ROC curve

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