丹参和白花丹参对黄芩化感效应的比较研究

采用室内生物测定法研究不同浓度（0、0.1、0.5、1.0、5.0 g/L）的1年生、2年生丹参和白花丹参根及根茎水浸液对黄芩种子萌发和幼苗生长的化感效应。结果表明， 丹参和白花丹参根及根茎水浸液对黄芩种子萌发率、发芽指数和活力指数表现出相似的影响趋势，即低浓度时促进种子萌发，随浓度增加化感抑制作用增强，浓度为5 g/L时抑制作用强烈。白花丹参根及根茎水浸液对黄芩种子萌发率的化感指数绝对值小于丹参。丹参和白花丹参根及根茎水浸液对黄芩幼苗苗高和根长表现出相似的影响趋势，高浓度时对幼苗鲜重的抑制作用较为强烈。白花丹参根及根茎水浸液对黄芩幼苗苗高和鲜重的化感指数绝对值小于丹参。丹参和白花丹参对黄芩种子萌发和幼苗生长均表现出低促高抑的双重效应，且白花丹参对黄芩的化感潜力小于丹参。该研究比较了丹参和白花丹参对黄芩的化感效应，可为优化复合种植模式提供科学依据。

Comparison of allelopathic effect of Salvia miltiorrhiza Bunge f. alba and Salvia miltiorrhiza on Scutellaria baicalensis

We employed indoor Petri dish bioassay analysis to determine the allelopathic effect of seeds and seedlings of Scutellaria baicalensis Georgi impacted by different concentration （0. 1, 0. 5, 1. 0, 5.0 g/L） and one year or two years old Salvia miltiorrhiza Bunge f. alba C. Y. Wu et H. W. Li and Salvia miltiorrhiza Bunge. Experimental results show that aqueous extracts of rhizome of S. mfltiorrhiza Bge. f. alba and S. miltiorrhiza exhibit similar effects on seed germination rate, germination index and vigor index of S. baicalensis. Lower concentration aqueous extracts of rhizome can promote seed germination while higher concentration aqueous extracts hinder germination （especially for the concentration of 5 g/L）. The absolute value of allelopathic index of S. miltiorrhiza Bge. f. alba to seed germination rate is less than that of S. miltiorrhiza. The aqueous extracts of rhizome of S. miltiorrhiza Bunge f. alba and S. miltiorrhiza show similar impacts on seedling height and root length of S. baicalensis. Higher concentration aqueous extracts of rhizome significantly restrain fresh weight of seedlings. The absolute value of allelopathic index of S. miltiorrhiza Bge. f. alba to seedling height and fresh weight of S. baicalensis is less than that of S. miltiorrhiza. All aqueous extracts of rhizome of S. miltiorrhiza Bge. f.alba and S. miltiorrhiza exhibit promotion effect of lower concentration and restraint effect of higher concentration to the seed germination and seedling growth of S. baicalensis. Moreover, the allelopathic potency of S. miltiorrhiza Bge. f. alba to S. baicalensis is less than that of S. mfltiorrhiza. The paper therefore can provide scientific basis for the optimization of compound planting pattern.