关键词: 苜蓿, 全生育期, 抗旱性鉴定, 评价方法

Abstract: By the field simulation drought method with rain-proof shed,we selected 12 alfalfa materials with different drought resistance at seedling stage to study the drought environment setting,identification indices and evaluation method selection. The results showed that the stress state started from the seedling stage,the stress cycle was the entire annual growing season. The selected evaluation indices were biomass,plant height and the number of plant branch. The methods of membership function and drought resistance index were adopted to evaluate the drought resistance of alfalfa materials. Compared with those evaluation methodsat seedling stage,the result showed better consistency with the methods of membership function during the whole growth period while a certain difference with the method of drought resistance index. The drought resistance identification at seedling stage has advantages such as short evaluation period,easy to operate,suitable for large number of materials and is of scientific to some extent. But the results of drought resistance identification during the whole growth period were more intuitive,accurate and reliable,which was suitable for evaluating the actual drought resistance of alfalfa.

Key words: Alfalfa, Whole growth period, Drought resistance identification, Evaluation methods