By covering different transparent membrane to filter UV-B radiation and using the method of ridge regression analysis,we studied the relationship between the photosynthetic gas exchange parameters of tobacco cultivar \'K326\' at its early maturity stage and the UV-B radiation intensity at the heights of 50 and 150 cm when the UV-B transmittances were 100%(CK),75%(A),50%(B) and 35%(C).

Effects of different mulching treatments on the gas exchange parameters and water use efficiency of winter wheat;

Gas exchange parameters of different wheat varieties were studied using hydroponic culture method.

Gas exchange parameters and chlorophyll fluorescence quenching kinetics were investigated to explore the effect of low phosphorus stress on photosynthesis,chlorophyll fluorescence characterisitics and energy distribution in rapeseed during different developing period.

Photosynthetic pigments,gas exchange parameters and yield of rice were determined.

The leaf gas exchange parameters,chlorophyll content and osmolytes were studied at different times.

Also,leaf gas exchange parameters(net photosynthetic rate,stomatal conductance and transpiration rate) were significantly decreased with the increase of water stress and the reduction in net photosynthetic rate was mainly due to the stomatal closure.

The leaf morphological characters and gas exchange at different leaf positions of 4 energy sugarcane genotypes were investigated at seedling and elongation stages by using CI-203 area meter instrument and CI-301PS photosynthesis system, respectively.

The salinity-adaptation physiology in different ecotypes of Phragmites communis in the Yellow River Delta Ⅱ.the characteristics of photosynthetic gas exchange in different ecotypes of Phragmites communis;

Photosynthetic gas exchange characteristics and carbonic anhydrase (CA) activity in flag leaves of high yield wheat variety Laizhou 953 as well as its filling grain course were studied with wheat variety Yangmai 5 as a control.