摘要
在自然条件下,利用LI-6400光合仪,测定了乌兰布和沙漠6个沙棘品种的光合蒸腾特性及主要环境因子的日变化,并采用相关系数、通径系数和决策系数探讨了主要环境因子对沙棘品种光合蒸腾日变化的影响.结果表明:6个沙棘品种的净光合速率呈典型的"双峰"曲线,在13∶00左右有明显的光合"午休"现象;‘白丘’与‘深秋红’蒸腾速率日变化呈"双峰"曲线,其余4个沙棘品种呈"单峰"曲线;PAR是直接影响沙棘光合蒸腾速率日变化的最大环境因子,并起主要决策作用;Ca、Ta和RH间接影响沙棘的光合蒸腾速率日变化,是主要限制因子.
Under natural conditions,diurnal changes of photosynthetic and transpiration rate of six seabuckthorn cultivars and main environmental factors were measured by using LI-6400 photosynthesis system.The correlation coefficient,path coefficient and decision coefficient were used to determine the effects of main environmental factors on the diurnal changes of photosynthetic and transpiration rate of sea-buckthorn cultivars.The results were as follows：Diurnal change of photosynthetic rate of six sea-buckthorn cultivars showed bimodal pattern and an obvious midday depression at 13∶00o＇clock.Diurnal change of transpiration rate of‘Baiqiu＇and‘Shenqiuhong＇both showed bimodal pattern,which of the others showed unimodal pattern.PARhad the greatest effect on the diurnal dynamics of photosynthetic and transpiration,and was the primary determining factor.Ca,Taand RH affected photosynthetic and transpiration mainly through their acting on PAR,and were the main limiting factors.
出处
《甘肃农业大学学报》
CAS
CSCD
北大核心
2015年第2期116-121,共6页
Journal of Gansu Agricultural University
基金
中央级院所基本科研业务专项(CAFYBB2011005-6)
国家林业科技推广项目([2012]31号)
中央级院所基本科研业务专项(CAFYBB2012003)
国家林业种质资源平台项目
关键词
沙棘
光合速率
蒸腾速率
环境因子
Hippophae rhamnoides L.
photosynthetic rate
transpiration rate
environment factor
