Medicinal Licorice Suitable Environment Based On Gis Technology And Its Impact Factor Analysis

Liquorice root is not only a kind of medicinal material which is well known in China, but also a sand binder in the western desert and hemieremion districts of China. Its main sources are Glycyrrhiza uralensis Fisch., G. Inflata Batal., G. glabra Linn. Due to the increasing use by the human being, more and more wild Radix Glycyrrhizae have been destroyed, resulting in devastating destruction and exhaustion of wild resources and deterioration of biological environment. In order to insure sustainable utilization of Radix Glycyrrhizae and meet the increasing demand, it is important to establish a scientific and reasonable strategy to use Radix Glycyrrhizae. For producing high quality of Radix Glycyrrhizae, one should first understand the distribution of Radix Glycyrrhizae source, the affecting factors to its distribution, output and quality, and then select the suitable producing areas to plant.The dissertation analyzes the geographical spatial distribution, ecological characteristics of Radix Glycyrrhizae and environmental affecting factors in distribution area by GIS and statistics based on the data of geography, meteorology, and soil for three types of Radix Glycyrrhizae collecting from 249 counties and cities. With the above results, suitable producing areas for Radix Glycyrrhizae are analyzed by the system of TCMGIS-1. Lastly regression analysis has been carried out between amount of Glycyrrhizic acid, total flavonoids, reserving amount for wild Radix Glycyrrhizae and the environment. Analytic results are as follows:1.Based on GIS, geographic information data base has been established on View GIS platform, so that data and graphics linked perfectly, which not only provide information file but also lay a sold foundation for further analysis of geographic spatial distribution and factor analysis. In the same time, the use of GIS improves managerial level of information and sources, realize virtualization of Chinese medicine information and ecological environment information. With further improvement, the data base can provide spatial information search and services.2.With the help of GIS and statistics, geographic spatial distribution and ecological environment characteristics are illustrated both in graphics and words: G. Inflata Batal has the strictest conditions for heat and light and is best at tolerating drought, G. glabra Linn. is the second best, G. uralensis Fisch. the third. The findings are conduced to reveal Radix Glycyrrhizae's living conditions for selecting its optimum place of production.3.Factor analysis for three medicinal Radix Glycyrrhizae suggests: distribution of G. uralensis Fisch. is mainly influenced by the factor of heat, while distribution of G. glabra Linn. and G. Inflata Batal are mostly influenced by the factors of heat and atmospheric water, and those varied in influencing effects. Coefficients and scores concluded from factor analysis lay a foundation for analyzing place of production for the three medicinal types of Radix Glycyrrhizae.4.With the above researches, suitable producing areas for Radix Glycyrrhizae are analyzed by the system of TCMGIS-1.The results show that habitat of three medicinal Radix Glycyrrhizae increased remarkably, which will be the potential growing areas to provide references for selecting planting base for artificial cultivation of Radix Glycyrrhizae. Suitability analysis of Radix Glycyrrhizae in Hangjin County indicates that the ecological environment around Hangjin County, and in Xilinguolemeng of Inner Mongolia, North, East of Xinjiang are similar to that of Hangjin County, suggesting they will be possibly new developing bases.5.With the help of multiple regressions, relationship among content of glycyrrhizic acid, total flavonoids and environment are studied and regression equations are obtained. It has been suggested that content of glycyrrhizic acid is relatively high in such areas as with long frostless period, high temperature in July, large quantity of sun radiation per year, large amount of precipitation, frequent gale occurrence with low speed. The amount of total flavonoids is higher in the areas with large amount of precipitation, high temperature in July, long frostless period, high longitude, high sea level, and low wind speed per year. The dependability analysis suggested amount of glycyrrhizic acid and total flavonoids depend on one another remarkably, moreover the tendency to increase or decrease is alike. By comparing the two regression equations, it can be implied environment factors such as heat, precipitation, wind have similar influences on contents of total flavonoids and glycyrrhizic acid, which may explain the relative strong dependability.6.Using analytic method of order multiple logistic regression to analyze relationship between reserves grade of wild Radix Glycyrrhizae and environment variants. Through studies environment variants with remarkable significance to reserve amount are confirmed as follows: latitude, number of days of gale, mean temperature of a year,≥10℃accumulative temperature, and precipitation, abundance of Radix Glycyrrhizae and area of counties. Besides possibility-prediction model for each grade are established with a mean coincidence rate of70.6%. As for reserve amount less than 1000 tons, accurate discrimination rate reach as high as 90.2% which is very helpful in rejecting areas with scarce Radix Glycyrrhizae resource as we look for rich-abundant, high-reserves areas. Through this study, we get to know the living condition required by all sorts of Licorice and the environmental influence on its distribution. Therefore, the research has a guiding significance for the sustained utilization and exploration of Licorice resource.The innovative points and the special feature of this research are: (1) by using GIS, the management and utilization of the resource information of Licorice has been greatly improved. Information on the resource and environment becomes visualized. (2) It is the first time that living condition and influence factors of 3 kinds of Licorice for medical utilization have been studied completely. Meanwhile dominant factors and its weight coefficient have been determined by the method of factor analysis, which provide the scientificity and authenticity of the analysis of habitat suitability. (3) By applying the TCMGIS-I system, the potential distribution region of the 3 kinds of medical Licorice has been figured out, which will be used as a guide for the introduction and cultivation of Licorice efficaciously.