Study on Response Characteristics of Physiological Indexes of Spring Wheat in Key Growth Stages to Drought Process
In order to study the response characteristics of spring wheat physiological indexes to the change of soil moisture content,the variety of Dingxi 40 was used as test material in a pot experiment in 2019.Two water treatments including control(CK)and drought(DR)were set at the early jointing stage,and the response characteristics of leaf water potential(LWP)and photosynthetic physiological parameters to the change of soil moisture content were analyzed.The results show that LWP decreases significantly with the continuous decline of soil moisture.LWP at 07:00 am is more sensitive to the change of soil moisture than at 11:00 am.With the decreasing soil moisture,leaf net photosynthetic rate(Pn),transpiration rate(Tr)and intercellular CO2 concentration(Ci)decline rapidly with the decrease rate being 64%,76%and 70%on average,respectively.LWP,Pn,Tr,Rs and Ci have exponential function relationships with relative soil moisture(RSM),and the determination coefficient is between 0.310 and 0.874.The results show that the relationship between water use efficiency(WUE)and RSM is a power function(R2=0.212).This research result can provide a theoretical basis for efficient water usage and drought monitoring of spring wheat in the semi-arid area of the Loess Plateau.
spring wheatphysiological indexdroughtwater potentialsoil moisture
万方数据
维普
