北方农牧交错带草地建植模式及效益比较研究——以宁夏盐池县马儿庄为例

以宁夏盐池县马儿庄节水灌溉优质牧草种植示范项目区为研究对象,运用成本-收益比较法,分析了4种建植草地的经济效益;运用灰色综合评判法比较评判了4种建植草地的水分、养分的状况及发展趋势。结果表明,水分的高低状况是甘草-苜蓿混播草地>苜蓿草地>甘草草地>天然草地,水分的变化趋势优劣是甘草草地>甘草-苜蓿混播草地>天然草地>苜蓿草地;土壤的养分状况是甘草草地>苜蓿草地>天然草地>甘草-苜蓿草地,养分的变化趋势是甘草-苜蓿草地越来越差,其他3种草地变化趋势相似,先升高,后降低,又升高,呈波状变化;4种草地经济效益由大到小的顺序是甘草草地>甘草-苜蓿混播草地>苜蓿草地>天然草地。从综合效益考虑,甘草草地是4种草地模式中最佳的草地。

Measurement and comparison of glycyrrhizic acid contents in root of licorice(Glycyrrhiza uralensis Fisch.)from different cultivating areas

The samples of licorice (Glycyrrhiza uralensis Fisch.) from 14 different cultivated areas were determined by the method of high Performance Capillary Electrophoresis (HPCE) for the contents of glycyrrihizic acid (GA) in root. The results showed that the licorice plants come from various cultivated areas of China has different contents of GA. The GA content of licorice from Zhaodong in Heilongjiang Province is the highest, followed by those from E抰uoke, Chifeng, and Hangjin Banner in Inner Mongolia. Some suggestions for establishing the production base of licorice were put forward based on the study.