Relationship Between Diurnal Changes of Photosynthesis and Environmental Factors of Juglans regia

In order to provide a theoretical basis for cultivation and resource development of J.regia Xilin 2,the diurnal changes of photosynthesis were measured by using Li-6400 portable photosynthesis system,the relationship between photosynthetic parameters and environmental factors was quantitively analyzed by using correlation analysis methods.Results:The diurnal changes of net photosynthetic rate(Pn)of J.regiaexhibited significant peaks and troughs,the lowest value appeared at about 14:00,there was a clear lunch break phenomenon.Diurnal changes of stomatal conductance(Gs)was declining over time.However,the magnitude of change in one day was different in a decrease of 73.69% during 8:00—10:00,but after 10:00declined more stable.Diurnal changes of intercellular CO2concentration(Ci)showed a downward-rise-fall-rising trend,trough appeared at 10:00and 16:00,which were 14.239 3μmol/mol and 22.291 7μmol/mol respectively.Diurnal changes of leaf temperature(Tleaf)and water vapor pressure deficit(Vpdl)showed a decrease after the first rising trend,appeared unimodal,both appeared in the 14:00maximum,which were 43.73℃ and 7.887 5kPa respectively.PAR,Ca and RH were significantly positively correlated with Pn(p0.05),Pn was significantly negatively correlated with Ta(p0.05).There was a significant negative correlation between Ta and RH(p0.01),Vpdl and Tleaf were of a significant positive correlation with Ta(p0.01).Ca was highly significantly positively correlated with Gs(p0.01).RH was of a significant positive correlation with Gs(p0.05),However,RH and Vpdl showed a significant negative correlation(p0.05).

Перевод пока недоступен