Effects Of Elevated CO₂ Concentration On Photosynthate Distribution And Soil Nutrients Of Lycium Barbarum

Taking Lycium Barbarum L. seedlings as research material, and using open top chamber to control CO2 concentration, using the method of 13C isotope labeling, study the effects of elevated CO2 concentration on photosynthate accumulation and distribution of Lycium barbarum L. Determined the characteristics of photosynthesis and chlorophyll fluorescence parameters, soil nutrient, soil microorganism and soil enzyme, and fruit quality, analysis the impact mechanism of elevated CO2 concentration on Lycium Barbarum. results show:1、The distribution of photosynthetic products in different organs is:Fruit> root> stem> leaf; doubled CO2 concentration treatments, the accumulation of C assimilation of photosynthesis of Lycium barbarum in various organs have obvious increasing trend; comparison of photosynthetic products distribution proportion in different organs was found, doubled CO2 concentration treat 60d, photosynthetic products increased significantly in the stem distribution proportion; the treatment of 120d, declined significantly in the allocation of photosynthetic products the proportion of root.2、Doubled CO2 concentration treatment, the Pn, WUE and Ci of Lycium barbarum Leaves were significantly higher than the control; in the fast-growing period, leaf transpiration rate significantly decreased, but in the later growth period, there is no difference on transpiration rate under the two treatments; the gs of treatment in earlier period was smaller, and late was higher than control.3、Compared with the control, CO2 concentration doubling treatment for 60 days and 120 days, the Fo of Lycium barbarum Leaves did not change significantly, FmFv/Fo、Fv/Fm、ETR and Yield(Ⅱ) values are showing a rising trend.4、Doubled CO2 concentration treatment, soil bacteria and actinomycetes significantly reduced, the number of fungi with an upward trend; soil urease, soil phosphatase and soil invertase activity significantly reduced, soil catalase activity increased.5、Doubled CO2 concentration treatment, total sugar and carotenoid content in the fruit of Lycium Barbarum decreased significantly, the polysaccharide content also decreased, but the flavonoid content increased significantly. Therefore CO2 concentration has adverse effect on fruit quality.