CAJ | 학술논문

宁夏红枣开花期,用CIRAS-1便携式光合仪测定田间活体红枣的净光合速率（Pn）、蒸腾速率（Tr）、气孔导度（Gs）、细胞间隙CO2浓度（Ci）等光合生理生态因子,以及光合有效辐射（PAR）、大气CO2浓度（Ca）、相对湿度（RH）、大气温度（Ta）、叶温（Tl）等环境因子的日变化。结果表明：红枣Pn日变化曲线为＂双峰＂型,午间有明显的＂午休＂现象,气孔因素是导致其＂午休＂的主要原因。Tr、Gs和Ci的日变化曲线均为＂双峰＂型,红枣叶片Pn随环境因子日变化的最优逐步多元回归方程为YPn=-49.168-0.002 21 xPAR＋1.776 xTa-0.445 xTl＋0.003 736 xCi＋0.67 xRH（R2=0.994,P〈0.05）,Ta和RH是对Pn直接影响最大的生态因子,而其他因子间接影响Pn的变化。
저하홍조개화기,용CIRAS-1편휴식광합의측정전간활체홍조적정광합속솔（Pn）、증등속솔（Tr）、기공도도（Gs）、세포간극CO2농도（Ci）등광합생리생태인자,이급광합유효복사（PAR）、대기CO2농도（Ca）、상대습도（RH）、대기온도（Ta）、협온（Tl）등배경인자적일변화。결과표명：홍조Pn일변화곡선위＂쌍봉＂형,오간유명현적＂오휴＂현상,기공인소시도치기＂오휴＂적주요원인。Tr、Gs화Ci적일변화곡선균위＂쌍봉＂형,홍조협편Pn수배경인자일변화적최우축보다원회귀방정위YPn=-49.168-0.002 21 xPAR＋1.776 xTa-0.445 xTl＋0.003 736 xCi＋0.67 xRH（R2=0.994,P〈0.05）,Ta화RH시대Pn직접영향최대적생태인자,이기타인자간접영향Pn적변화。
During the full-bloom stage of Ningxia ZiZyphus jujube,the diurnal dynamics of photosynthetic rate（Pn）,transpiration rate（Tr）,stomatal conductance（Gs）and internal CO2（Ci）,as well as the ecological factors photosynthetically active radiation（PAR）,CO2 concentration in field（Ca）,relative humidity（RH）,air temperature（Ta）and lear temperature（Tl）were measured.The results showed that the diurnal net photosynthetic rate of ZiZyphus jujube in sunny day exhibited double-peak pattern.There was a significant midday depression with ZiZyphus jujube,which was caused principally by stomatal factors such as stomatal conductance.The curves of diurnal variation in Tr,Gs and Ci of ZiZyphus jujube leaves also had two peaks.The most optimal equation describing diurnal variation of Pn was attained by the method of stepwise multiple—regression as follows：YPn=-49.168-0.002 21 xPAR＋1.776 xTa-0.445 xTl＋0.003 736 xCi＋0.67 xRH（R2=0.994,P0.05）.With the analysis of partial correlation and path on Pn and environmental factors,it was concluded that Ta and RH had the greatest effect on the diurnal dynamics of Pn,while other factors indirectly affected Pn.