Effects Of Vapor-permeable Reflective Film On Microenvironment And Fruit Quality Of Sweet Cherry Tree In The Protected Area

Sweet cherry?Prunus avium L.?is one of the most widely appreciated fruit for its taste,sweetness,and color.Environmental conditions have significant effects on yield and quality of fruit.Fruit quality is closely associated with the strength of photosynthesis,and can be directly affected by sunlight intensity during sweet cherry maturation.Studies have revealed that reflective mulching materials can improve light distribution at the canopy by increasing reflected light from the ground;this improves photosynthetic effectiveness and regulates sugar metabolism as well as the activity of anthocyanin synthesis-related enzymes,thereby affecting fruit sugar accumulation and coloration.Studies have demonstrated that reflective film mulching can improve light utilization in peach,apple,plum,grape and citrus trees,thereby increasing photosynthesis to improve fruit quality.However,few study on correlation between reflective film and fruit quality had been made so far in sweet cherry.In order to explore the effects of vapor-permeable reflective film on the microenvironment and fruit quality of sweet cherry in the protected area.Three test sites of Wafangdian,Weifang and Fengxian were selected,the vapor-permeable reflective film was covered for treatment and the non-filming was used as control.Fruit color,TSS,TA,pH,anthocyanin content,vitamin C,reflected light intensity and quality,leaf net photosynthetic rate,rhizosphere soil microbial content and soil temperature were analyzed.Vapor-permeable reflective film significantly improved the light environment,the light intensity,measured perpendicular at 130 cm and 90cm was 6.2 times and 3.9 times than that of the control.Vapor-permeable reflective film improved the net photosynthetic rate and reflected light quality,the highest net photosynthetic rate of sweet cherry leaves appeared at 11 o'clock,and the P_n values treated with vapor-permeable reflective film and the control were 15.5?mol·m^-2·s^-1 and 14.1?mol·m^-2·s^-1,respectively.The soil temperature at 15 cm and 30 cm of the vapor-permeable reflective film treated was reduced by about 1.7?and 0.6?,when compared with the control.Fruit treated by vapor-permeable reflective film had smaller chroma value and chroma angle,the anthocyanin content was higher than control.The vapor-permeable reflective film increased the soluble solid content,which was 1.3-1.8 percentage points higher than that of the control,and had little effect on the titratable acid content.