To investigate the response mechanism of chlorophyll fluorescence parameters and root activity of blueberry under different drip irrigation methods, and provide scientific basis for the efficient irrigation of blueberry. Through field experiment and comparative analysis, the effects of different drip irrigation methods on chlorophyll fluorescence characteristics, photosynthetic pigments and root activity of blueberry were studied. With 3 years old blueberry seedlings as experimental material, conventional drip irrigation, mulching film drip irrigation and mulching straw drip irrigation were designed. Compared with conventional drip irrigation, both the mulching film drip irrigation and mulching straw drip irrigation could improve the PSⅡpotential photochemical activity (Fv/F0), light capture efficiency (Fv′/Fm′) , actual photochemical efficiency (Yield) and photosynthetic pigment content of blueberry leaves, the treatment effects of latter is more obvious. The photochemical quenching coefficient (qP) of and root activity of plants with straw mulching increased significantly, however, there was no significant difference between the non photochemical quenching coefficients (NPQ) of different treatments. Besides, the biomass of roots, stems and leaves of the plants under the mulching film drip irrigation and mulching straw drip irrigation also increased, the dry weight of root and leaves of the latter was 8.22% and 16.97% heavier than that of the former, respectively. Drip irrigation with straw mulching is beneficial to improve the chlorophyll fluorescence characteristics and root activity, and it is more suitable for the growth of blueberry in greenhouse.
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