Abstract: The calorific value of Medicago populations from northern Xingjiang and cultivars were measured using Parr measurement. The results showed that the wild Medicago populations from northern Xingjiang contain the major resources of resistant and high light energy cumulative rate. This result related to the morphological characters of thin leave, lower rate for leave weight/total plant weight and the lower value for growth habit(oblique growth). The Medicago populations which grow in the regions of higher temperature and humidity condition contain lower calorific value than that of drier and colder condition. The soil which was moderate pH has the advantage of cumulating calorific value.

Key words: Medicago populations, Calorific value

摘要： 用氧弹式自动测热仪测定苜蓿不同种群植物体的热值。结果表明,引自北疆的野生苜蓿蕴藏着重要的抗性和光能累积资源,其叶片狭窄、叶重/总株丛重比值低、茎重占总株丛重的比值高、生长习性值低(斜生性强)。引自气温较高,湿度较大地区的苜蓿,其热值低于干燥寒冷地区。中性和近中性土壤有利于苜蓿热值积累和光能累积。

关键词: 苜蓿, 热值