紫花苜蓿根系生长特性的品种比较

The root characteristics of different alfalfa varieties

本研究以贵州黔南地区种植的12个国外紫花苜蓿(Medicago sativa)品种为材料,比较其根系发育形态特征及其与地上生物量间的相关性。结果表明,不同紫花苜蓿品种间根系形态特征均有显著差异(P<0.05);地上生物量与根颈直径、分枝数、主根长和根系干质量均呈极显著正相关(P<0.01);地下生物量与根颈直径、入土深度、分枝数、芽数、主根长和主根直径均呈极显著正相关;通径分析结果显示,对根系生物量贡献最大的因子为根颈直径、分枝数、主根长和侧根数。根据根系特征指标对12个苜蓿品种进行聚类可分为3类。

The root development characteristics and the correlation with the aboveground biomass of twelve alfalfa varieties introduced from American, Germany and Canada and planted in Qiannan area in Guizhou were studied. The results showed that the root morphological characteristics of different alfalfa varieties had significant difference（P〈0, 05）. The aboveground biomass had extremely significantly positive correlation（P〈0.01） with the root collar diameter, the branch number, the main root length, and the root dry weight. The underground biomass had extremely significantly positive correlation with the root collar diameter, the depth, the number of branches, the bud number, the main root length and the root diameter. Through path analysis, the greatest contribution factors for the root biomass were the root collar diameter phology , number of branches, characteristics, the twe ength of main root and lateral root number. According to the root mor ve alfalfa varieties can be clustered into three categories.