Effects of Wind-Blown Sand Disaster on the Cotton Photosynthetic Character in South Xinjiang

In arid and semi-arid sandy area, strong wind-sand flow activities as one of the main environmental characteristics, has great effect on the plants, they are the important restraint factors for cotton cultivation and growth. Two groups with three replicates were set for cotton which is not affected by wind-blown sand and affected by wind-blown sand,photosynthetic parameters was determined at different growing stages of cotton, and the effect on photosynthetic characteristics of cotton was investigated. Results showed that cotton photosynthetic parameters affected by wind-blown sand were significant in the seedling stage and bud stage, but there were no significant difference in the blooming stage. Cotton leaf will be affected by wind-blown sand, with leave scar on the blade. Photosynthetic rate(Pn),stomatal conductance(Cs),intercellular CO2concentration(Ci) and transpiration rate(Tr) of new wounded cotton function leaf were significantly lower than that of the old wounds and uninjured. Dust falls have a great effect on cotton leaf photosynthesis parameters after the wind-blown sand. Unit leaf area dustfalls show significant negative correlations with photosynthetic rate(Pn), stomatal conductance(Cs), intercellular CO2concentration(Ci) and transpiration rate(Tr).