Investigation On The Alien Invasive Plants In Nanyue And Quantitative Risk Evaluation To Several Species Of Them

Nanyue is an important national natural reserve zone of our country, its touristtrade is very prosperous, and this provided convenient conditions to the alieninvasive plants to comeing in and spreading. The invasion of these alien harmfulplants will affect gravely on Nanyue biodiversity and ecosystem' s stability. But theproblem of alien invasive plants is a blank space in the Hunan province so far. Thispaper take Nanyue natural reserve as an example, Firstly carried out investigationand study on the alien invasive plants, and made quantitative risk evaluation to theseveral representative species of them.The content of this paper include the following three parts:1.26 species of alien invasive plants belonging to 17 families in Nanyue naturereserve were identified, Based on investigation and related literatures. And weanalysed the invasive species on their situation, characteristic,reason and preventivestrategy.2. In this paper, the quantitative risk evaluation method suitable for Nanyuealien harmful plants was established with referring to the pest risk analysis methodby International and national experts, based on the character of those plants inNanyue, and made an explanation to the reason of each index, analysised the appliedrange and characteristics of it.3. This paper made a detailed quantitative risk analysis evaluation to the fivealien invasive plants in Nanyue nature reserve, such as rymbosa etal, wielding theNanyue alien harmful plants risk quantitative analysis method that improved by thispaper. The results showed that Galinsoga parviflora and Conyza canadens are themore devastating plants; Oxalis corymbosa,Lepidium virginicum and PhytolaccaAmericana are moderate risk plants, but Oxalis corymbosa approaches to the moredevastating, and the Phytolacca Americana approaches to the low degree risk.Finally, it is suggested that how to management the five invasive plants based on thestudy.