摘要
晴天利用Li-6400光合仪研究了田间自然条件下匍匐翦股颖品种普特(Putter)的光合作用日变化特性。结果表明:净光合速率(Pn)、蒸腾速率(Tr)和气孔导度(Gs)的日变化曲线均呈“双峰”型,存在明显的光合“午睡”现象。水分利用效率(WUE)和胞间CO2浓度(Ci)的日变化进程都呈下降趋势。根据Pn、Ci、气孔限制值(Ls)的变化方向,推测匍匐翦股颖的光合“午休”主要受气孔因素限制。相关分析结果表明,Pn、Tr与光合有效辐射(PAR)都呈显著正相关,相关系数分别为R=0.674和R=0.852,与大气温度(Ta)都呈现不显著正相关关系,与相对湿度(RH)都呈现不显著负相关关系。从相关系数的大小来看,各生态因子与Pn的相关性大小排序PAR>Ta>Ca>RH。各生理因子与Pn的相关性大小排序为:Tr>Gs>Ci>WUE。
On fine days, daily dynamics of photosynthetic characteristics in A. stolonifera L. varieties (Putter) under nature conditions were monitored using Portable Li-6400 Photosynthesis System. The results summarized as follows: the curves of diurnal variation in Pn,Tr and Gs of A. stolonifera L leaves had two peaks, and an obvious midday depression. The diurnal variation of WUE and Ci tended to decline;Based on the tendency of changes in Pn, Ci, Ls,it was speculated that the midday depression of A. stolonifera L was controlled by stomata factor;Correlation analyses showed that the Pn and Tr values were high relative with that of PAR (R=0. 674 and R=0. 852, respectively),but not with that of Ta and RH. The sequence of correlation between each ecological factor and Pn could be ranking from the highest to the lowest: PAR〉Ta〉Ca〉RH. The sequence of correlation between each physiological factor and Pn is Tr〉Gs〉WUE〉Ci.
出处
《北方园艺》
CAS
北大核心
2007年第6期20-23,共4页
Northern Horticulture
基金
西南区野生冷季型草坪草种质资源收集与评价(05JY029-034-2)
关键词
匍匐翦股颖
光合日变化
生理生态特性
Agrostis stolonifera L
Diurnal variation of photosynthesis
Physio-ecological characteristic