Response Of Fluorescence Kinetic Parameters Of Several Psammophytes To Soil Moisture Change

The relative photosynthetic electron transfer rate(ETR),actual photochemical quantum yield(Yield),the maximum initial conversion efficiency(Fv/Fm)and non photochemical quenching(Yield)were measured by the determination of chlorophyll fluorescence kinetics(ETR)in different soil water content(volume)conditions of willow,Salix,Elaeagnus Elaeagnus,amorum Acacia,amorum amoridum,wood and Berberis.NPQ)4 fluorescence parameters.The changes of parameters under different soil moisture were observed.Finally,the drought resistance of plants was analyzed by the results of water parameters and chlorophyll fluorescence parameters.1.7 kinds of plants showed similar trend of Yield on duty.From 8:00,with the increase of light intensity,the Yield value gradually decreased,basically at 12:00 to the lowest value,then the light intensity decreased and began to rise,and then back to the afternoon and back to the state of the initial value.2.The ETR values of 7 sample plants showed some regular changes.With the increase of light intensity,the ETR value also increases.It shows a single peak or Shuangfeng convex curve.3.The NPQ values of the 7 species of plants increased with the increase of light intensity at 8 a.m.,and the curves changed basically to a convex curve.The data showed that 7 plants reached the maximum at 12 points at noon or 2 p.m.or 4 p.m.under three different soil moisture conditions,and were planted in 7 samples under different soil moisture conditions.The NPQ value of soil increased differently under different soil water contents.4.The 7 species of plants between Yield and ETR,the maximum conversion efficiency of the original and NPQ values showed a similar trend.With the decrease of soil moisture content,Yield and ETR value decreased and NPQ increased,which could be used for drought tolerance analysis.