青藏高原不同垂穗披碱草居群营养品质季节动态比较

Analysis on nutritional quality of Elymus nutans among different populations on Qinghai-Tibet Plateau

对青藏高原地区6个垂穗披碱草（Elymus nutans）居群8个不同生育期的可溶性糖（WSC）和粗蛋白质（CP）含量进行了测定。结果表明,居群间不同生育期WSC和CP含量存在显著差异（P〈0.05）,种源地来自青海共和县居群和甘肃临潭县居群WSC含量在整个生育期显著高于其他4个居群;CP含量甘肃玛曲县居群显著高于其他居群。整个生育期,WSC含量呈单峰曲线,初花至盛花期最高（P〈0.05）,初花期WSC含量最高为6.91%,最低为1.58%,CP含量整体表现为下降趋势,完熟期最低。不同居群间WSC和CP含量均表现出一定变异度,其变异系数变幅分别为36.47%~51.29%和4.76%~20.29%。相关性分析表明,WSC与CP含量呈显著负相关。

The content of water soluble carbohydrate（WSC） and crude protein（CP） of six Elymus nutans populations from Qinghai-Tibet Plateau were investigated in the study.The results indicated that：There were significant differences in WSC and CP content among different populations in different growth stages.The highest content of WSC was observed in the population from Gonghe,Qinghai,The highest content of CP was observed in the population from Maqu.The WSC and CP contents varied significantly in different growth stages,the highest value appeared in early blooming stage,ranging between 1.58% and 6.91% for the six populations.The CP content decreased as the plant grew,the Lowest values was observed in the full ripe stage.The content of WSC and CP showed determinate variabilities,the coefficient of variabilities ranged from 36.47%～51.29% and 4.76%～20.29%,respectively.In the whole growing stage,the WSC contents were significantly and negatively correlated with the CP contents（P0.01）.