Application of factor analysis to studying environmental factors with influencing effects on geographical distribution of Glycyrrhiza Radix et Rhizoma / 中草药

ABSTRACT

Objective: Application of factor analysis to studying ecological dominant factors with influencing effects on geographical distribution of Glycyrrhiza Radix et Rhizoma. Methods: Gathering statistics of the regions (city and county) with Glycyrrhiza Radix et Rhizoma distribution and the geographical environment factors of them, including longitude and latitude, elevation, frostless season, average wind speed, gale days, annual averrage temperature, January average temperature, July average temperature, ≥10°C accumulative temperature, evaporation, precipitation, annual sunshine hours, annual global solar radiation, etc. And then SPSS 17.0 software is used in the factor analysis. Results: Five common factors, which are heat factor, geographical factor, illumination factor, precipitation factor, and wind conditon factor, are extracted, and the accumulative contribution rate of them is up to 87.64%. Factor total score of each region with Glycyrrhiza Radix et Rhizoma distribution is obtained. Conclusion: The heat factor is the ecological dominant factor influencing on geographical distribution of licorice, the region with high factor total score is more appropriate for the growth and distribution of Glycyrrhiza Radix et Rhizoma.