Progress of Research on Endangered Situation of Plant Species

The reduction of biodiversity is universal paid attention by all countries in the world.Species protection becomes a global problem.Evaluation of the endangered species will provide a basis for assessing levels of protection,which is the foundation of the species protection.The scholars act in work of endangered grading of endangered species,and explore the endangered classification method.The majority of scholars adopt the coefficient of endangerment as the way of assessment endangered grading.First choosing assessment index,classification,and making the endangered situation of the development evaluation system,and then calculated endangered coefficient and divided endangered grade.Now,choosing the assessment index of endangered coefficient isn't uniform requirements and standards,and scholars choose assessment index according to their object and purposes.Most of scholars adopt 4-6 indicators.Although the assessment system of endangered species adopts the way of quantitative evaluation,but there are still major human factors.The assessment index,indicators of classification and assignment are determined to be in man-made,and then the results also include human factors.Some scholars have recognized the point,assignment scores have been adjusted.In endangered classification,there are a variety of methods and standards,but which are very much the same in real,their name are different.