不同秋眠等级苜蓿根系性状对越冬的影响

筛选适宜黑龙江省西部地区种植的苜蓿品种，探究苜蓿越冬率与根系性状及产量之间的相关性，为建立苜蓿人工草地提供优良品种。以国内外8个不同秋眠等级苜蓿品种为材料，采用随机区组设计，测定苜蓿产量、越冬率和根系性状(根颈直径、体积、入土深度、根长、主根直径、根尖数量、侧根直径、侧根位置、侧根数量、根系生物量)指标，通过主成分分析和隶属函数评价筛选出最佳品种。公农2号、草原3号和肇东苜蓿的越冬率均大于95%，越冬率与根系生物量呈显著负相关(P<0.05)，相关系数为0.762；越冬率与根颈直径、入土深度呈显著正相关(P<0.05)，相关系数分别为0.797和0.756，与侧根位置呈显著负相关(0.712;P<0.05)。越冬率与产量呈极显著正相关(0.956;P<0.01)，其中肇东苜蓿、草原3号和公农2号产量较高，分别为12746.73、11921.24、11416.77 kg·hm^-2，显著高于其他品种(P<0.05)。经主成分分析选出根颈直径、体积、入土深度、根长、主根直径、侧根直径、侧根数量和越冬率作为鉴定苜蓿耐寒性的重要指标，应用隶属函...

Effect of root traits of Medicago sativa lines with fall dormancy on overwintering

Alfalfa （Medicago sativa） varieties suitable for cultivation in western Heilongjiang Province were screened to explore the relationships among winter survival rate， root traits， and yield. Eight alfalfa varieties with different levels of fall dormancy from China and abroad were tested in a regional field experiment， which was established with a randomized block design. The yield， winter survival rate， and root traits （root crown diameter， root crown volume， root crown depth in soil， root length， main root diameter， number of root tips， lateral root diameter， lateral root position， lateral root number， and root biomass） were measured for each variety. The winter survival rates of Gongnong No.2， Caoyuan No.3， and Zhaodong alfalfa were all higher than 95%. The winter survival rate was significantly negatively correlated with root biomass （P<0.05； correlation coefficient， 0.762）； and positively correlated with root crown diameter and crown depth in soil （P<0.05； correlation coefficients of 0.797 and 0.756， respectively）. The winter survival rate was negatively correlated with the position of lateral roots （P<0.05； correlation coefficient， 0.712）. There was a significant positive correlation between yield and winter survival rate （P<0.01； correlation coefficient， 0.956）. The yields of Zhaodong， Caoyuan No.3， and Gongnong No.2 were 12746.73， 11921.24， and 11416.77 kg·ha^-1， respectively， which were significantly higher than those of other varieties （P<0.05）. A principal component analysis identified root crown diameter， root crown volume， root crown depth in soil， root length， main root diameter， lateral root diameter， lateral root number， and winter survival rate as important indexes to identify the cold resistance of alfalfa. On the basis of the results of a membership function analysis， the alfalfa varieties were ranked from most to least cold resistant as follows： Zhaodong>Gongnong No.2>Caoyuan No.3>Gold empress>Caribou>420>Sanditi>Sardi. Because of their high yields and winter survival rates， Zhaodong， Caoyuan No.3， and Gongnong No.2 were identified as the most suitable lines for cultivation in western Heilongjiang Province.