广金钱草分布和品质适宜性区划研究

Research on distribution and quality suitability division of Desmodium styracifolium

通过对华南和西南地区(广东、广西、海南和云南)的广金钱草实地调研,结合夏佛塔苷、多糖的含量,运用最大信息熵模型和地理信息技术,分别筛选出影响广金钱草分布适宜性和品质适宜性的主导生态因子,再对广金钱草的分布和品质进行适宜性区划。分布区划的结果表明,4月均温、最冷季节均温、土壤类型和寒冷指数4个生态因子对广金钱草分布适宜性的影响最大。品质区划的结果表明:1多糖含量与4月降水量呈显著性正相关;夏佛塔苷含量与4月均温、最冷季节均温呈显著性负相关,与10月、11月降水量,4月、5月日照时长呈极显著负相关,与4月降水量、温度季节性变化标准差呈显著性正相关,与2月、3月降水量呈极显著性正相关。2分别以夏佛塔苷、多糖为品质指标,依据品质区划模型绘制出广金钱草的品质区划图。该研究可为广金钱草生产区划、种植基地选择和定向培育提供科学选址依据。

The research on distribution and quality suitability division of Desmodium styracifolium were formulated by Maxent and Arc GIS model based on the content of schaftoside and polysaccharide of D. styracifolium and its field research in the south and southwest areas of China（ Guangdong,Guangxi,Hainan and Yunnan）,and the most suitable habitats of distribution suitability and quality suitability were screened. The distribution suitability results indicated that average air temperature in April,mean temperature of coldest quarter,soil type,coldness index were found as the four dominant factors contributing to the plant distribution. The quality suitability results indicated that： 1Polysaccharide content and precipitation in April show significant positive correlation; Schaftoside content and mean temperature of April,mean temperature of coldest quarter show significant negative correlation. Schaftoside content shows significant negative correlation with the precipitation in October and November and the sunshine duration in April and May,while there is a significant positive correlation between schaftoside content and precipitation in April and temperature seasonality standard deviation,and a highly significant positive correlation was found between schaftoside content and precipitation in February and March. 2 The quality zoning map was drawn depend on general content of polysaccharide and schaftoside as the index of quality. And this research provides scientific location basis for the production regionalization,cultivation bases selection and directive breeding of D. styracifolium.