摘要
以青海云杉(Picea crassifolia)和沙地云杉(Picea mongolica)为试验材料,测定了正常供水条件、中度土壤水分胁迫、重度土壤水分胁迫条件下两树种的叶绿素荧光参数。结果表明:随着干旱胁迫的加剧,云杉属两种植物的实际量子效率(ФPSII)呈递减趋势;初始荧光(Fo)呈递减趋势;两种云杉的最大光化学量子产量(Fv/Fm)均集中在0.7左右,而且随着土壤水分的减少,最大光化学量子产量呈下降趋势;光化学猝灭系数(q P)呈递减趋势,非光化学淬灭系数(q N)随着土壤水分的减少呈递增趋势;PSⅡ实际光化学效率(Yield)与电子传递速率ETR表现出相似的规律性,均呈下降趋势。综合分析各项指标表明沙地云杉具有更强的抗旱性。
The chlorophyll fluorescence characteristics of two Picea species in normal soil water conditions,moderate soil water stress,and severe soil water stress were measured. The results showed that with the decrease of soil water,actual quantum efficiency（ ФPSII） of two species showed a trend of decline,the initial fluorescence（ Fo） showed a trend of decline,maximum photochemical quantum yields（ Fv/ Fm） of Picea mongolica and Picea crassifolia were concentrated around 0. 7,and as the drought stress increase,the maximum photochemical quantum yields（ Fv/ Fm） showed the decline trend,photochemical quenching（ q P） showed decline trend,t he photochemical quenching coefficient（ q N） showed increase trend. PSⅡ actual photochemical efficiency（ Yield） and the electron transfer rate of ETR showed decreasing trend. Comprehensive indicators showed that the Picea mongolica has more drought resistance than Picea crassifolia.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2015年第6期117-121,共5页
Journal of Arid Land Resources and Environment
基金
林业公益性行业科研专项(201104036)
甘肃省自然基金(1308RJYA091)
沙生植物保护利用科技创新团队(1207TTCA002)
国家林木(含竹藤花卉)种质资源平台建设项目资助
关键词
沙地云杉
青海云杉
土壤水分胁迫
荧光特征
Picea crassifolia Picea mongolica soil water stress fluorescent characteristics
