摘要
为了探讨华北高寒区北沙参光合生理特性,为区域北沙参栽培管理提供技术依据,采用ECA-PB0402光合作用测定仪的闭路系统和pocket PEA植物效率分析仪对北沙参的光合特性和荧光参数进行了研究。结果表明,夏季在晴天、土壤水肥充足条件下,华北高寒区北沙参日变化曲线呈双峰型,峰值出现在10:00和16:00。净光合速率最大值出现在10:00左右,此时的光饱和点LSP为2 070.0μmol/(m2.s),光补偿点LCP为181.2μmol/(m2.s),表观量子效率AQY是0.078 1,晴天北沙参叶片的PSⅡ最大光化学效率Fv/Fm由10:00的0.83下降到14:00的0.51,比最大值下降约39%。表明在自然晴天条件下,华北高寒区北沙参出现光合"午休"现象,在中午发生了一定的光抑制,属于典型的阳性植物,对光照的适应性较强,高光强的生态环境适宜种植北沙参。
A field experiment was conducted in Alpine area of North China to study the photosynthetic characteristics with Glehnia littoralis,and ECA-PB0402 photosynthesis closed system and pocket PEA were used in the study.The results showed that：Glehnia littoralis Pn showed a two peaks curve,when the soil with adequate moisture and fertilizer on summer sunny days,peak in 10：00 and 16：00.The net photosynthesis rate appear in 10：00,the light saturation point was 2 070.0 μmol/（m2 · s）,The light compensation point was 181.2 μmol/（m2 · s）,AQY decreases was 0.078 1,the maximum PSⅡ photochemical efficiency（Fv/Fm）of Glehnia littoralis leaf was declined to about 0.51 at 14：00 in sunny days,declined about 39% compared to the maximum value.The conclusion is that under the natural sunny conditions Glehnia littoralis showed a photosynthesis rest in midday and occurred some photoinhibition at noon,it is a typical positive plant,adaptability of sunlight,Better light conditions of the land should be selected,to increase the production of Glehnia littoralis.
出处
《华北农学报》
CSCD
北大核心
2011年第2期218-222,共5页
Acta Agriculturae Boreali-Sinica
基金
国家"十一五"科技支撑计划(2006BAD15B05-1)
河北省科学技术研究与发展计划项目(06220901D)
关键词
华北高寒区
北沙参
净光合速率
有效辐射
叶绿素荧光参数
Alpine area of North China
Glehnia littoralis
Photosynthetic rate
Photosynthetically active radiation
Chlorophyll fluorescence parameter
