Abstract:In order to select the gerplasm resources with strong tolerance in the abandoned land of ionic rare earth mine, twenty Canavalia ensiformis germplasms derived from more than 10 countries or regions were potted, the growth traits were observed and evaluated by variance analysis, membership function analysis and cluster analysis, variance analysis, membership function analysis and cluster analysis. The results showed that there were significant differences in plant height, ground diameter, stem thick, main stalk pitch number and aboveground biomass among different germplasms at seedling stage and initial flowering stage (P<0.05). The membership function analysis showed that comprehensive evaluation value of 20 germplasms were in the order of PI 279593>PI 362193>NT 576>BN-13474-63>PI 470242>PI 358592>B2>PI 181048>PI 364355>CHN3>PI 470931> PI 337078>CHN4>PI 164695>PI 276655>CPI 50103>B1>PI 338584>PI 404610>PI 308540. The cluster analysis showed that 20 germplasms could be divided into 5 categories, among which the fourth category had the best growth characteristics, followed by the fifth category, which was consistent with the result of membership function. The secondary screening experiment showed that the comprehensive evaluation value of the top five germplasms with good growth characteristics on ionic rare earth mine soil were in the order of PI 362193>NT 576>PI 279593>BN-13474-63>PI 470242. Therefore, PI 362193 had the strongest tolerance, which could be used as the best choice for ecological restoration of ionic rare earth mine, while NT 576 and PI 27959 can be used as candidate germplasms.
