THE RESPONSE OF MIDDAY DEPRESSION OF DIURNAL VARIATION OF NET PHOTOSYNTHETIC RATE OF WHEAT LEAVES ON ECOLOGICAL FACTORS IN THE FIELD ENVIRONMENT OF QINGHAI PLATEAU
The goal of this study was to explore the effects of water content of soil,relative water con-tent and water potential of wheat leaves and high air temperature,low air relative humidity understrong light in the field to the midday depression of diurnal va