Abstract: From the period when alfalfa turns green to its full blooming period, the legume's plant height and yield increase in a logistic model. Its crude protein, crude ash and phosphorus content decrease in a lineal form, while its crude fiber increases. The legume's yield of crude fat and calcium content has nothing to do with the plant growth time. The yield of leaves, crude protein, fat and ash, as well as that of phosphorus content increase in a quadrate pattern, while the yield of stems, crude fiber and calcium content accrue in a lineal style.

Key words: Grassland science, Dynamic model, Growth, Nutrient, Alfalfa

摘要： 苜蓿从返青到盛花期,株高和产草量呈Logistic型增长;粗蛋白质、粗灰分和磷含量呈线性负增长;粗纤维含量呈线性正增长;粗脂肪和钙含量与时间无相关性;叶片、粗蛋白质、粗脂肪、粗灰分和磷的产量呈二次型增长;茎、粗纤维和钙的产量呈直线型增长.

关键词: 草原学, 动态模式, 生长, 营养成分, 苜蓿