节点文献
日光温室草莓光合特性及对CO2浓度升高的响应
Changes of Photosynthetic Characteristics and Response to Rising CO2 Concentration in Strawberry in Solar Greenhouse
【摘要】 运用美国LI COR公司制造的LI 6 40 0便携式光合作用测定系统 ,研究了日光温室草莓盛果期的光合特性及对CO2 浓度升高的响应。结果表明 ,叶片净光合速率 (Pn)日变化呈双峰型 ,有明显的“光合午休”现象 ,第 1个峰值出现在 10时左右 ,Pn达到CO2 13 .1μmol·m-2 ·s-1;第 2个峰值出现在 16时 ,Pn为CO2 9.5 μmol·m-2 ·s-1。造成光合午休的主要原因为气孔因素 ,中午光照强度最大 ,叶片与空气之间的水蒸气压差、气孔限制值达到最大值 ,空气相对湿度、气孔导度、胞间CO2 浓度达到最小值 ,出现光合午休。在CO2 浓度低于 6 0 0 μmol·mol-1,光照强度为 10 0 0 μmol·m-2 ·s-1时 ,草莓CO2 饱和点为 943 .3μmol·mol-1,CO2 补偿点为 91.7μmol·mol-1,Pn高于光强更高者。
【Abstract】 The LI-6400 Portable Photosynthesis System of LI-COR was used to study the photosynthetic characteristics of strawberry and its response to the rising CO 2 concentration at the full-fruit stage in the solar greenhouse. The results showed that the daily variation of net photosynthetic rate in leaves presented a bimodal curve and an obvious’midday depression’phenomenon occurred.The first peak value was the highest,which occurred at about 10:00 am,the net photosynthetic rate was CO 213.1μmol·m -2·s -1,the second peak value occurred at 16:00 pm,the net photosynthetic rate was CO 29.5μmol·m -2·s -1.The main reason for the midday depression was stomatal factors.At midday,light intensity was the largest,vapor pressure deficit between leaves and air as well as stomatal limiting value reached maximum but air relative humidity,stomatal conductance and intercellular CO 2 concentration reached minimum and hence occurred photosynthetic midday depression.When light intensity reached 1000μmol·m -2·s -1 and CO 2 concentration was lower than 600μmol·mol -1,its net photosynthetic rate was higher than that of the much higher light intensity.At such light intensity the CO 2 saturation point was 943.3μmol·mol -1 and CO 2 compensation point was 91.7μmol·mol -1.
【Key words】 Strawberry; Photosynthetic characteristics; CO2 concentration; Solar greenhouse;
- 【文献出处】 园艺学报 ,Acta Horticulturae Sinica , 编辑部邮箱 ,2002年05期
- 【分类号】S668.4
- 【被引频次】160
- 【下载频次】642