关键词: 野百合, 土壤水分胁迫, 生理生化特性, 隶属函数法

Abstract: To understand the adaptation mechanism of Lilium brownii seedlings to soil water stress,the seedlings of Lilium brownii were used as test materials,the effects of different soil water stress on the physiological and biochemical characteristics of Lilium brownii seedlings were studied by potted water control method, and the suitable soil water content was screened.The results displayed that the soil relative water content neither high nor low was conducive to the growth of Lilium brownii.The leaf relative water content decreased,but the water saturation deficit and malondialdehyde content increased under water stress.With the increase of stress degree,leaf stomatal density,chlorophyll content,soluble protein content,peroxidase activity,superoxide dismutase activity and other indicators performed a trend of high first and then low.The free proline content,soluble sugar,cell membrane permeability and other indicators showed a first low and later high trend.Based on the membership function method,it is concluded that slight soil water stress,50%—55% soil relative water content,is suitable for the normal growth of Lilium brownii seedlings in bulb stage.

Key words: Lilium brownii, Soil water stress, Physiological and biochemical characteristics, Subordinate function methed