【摘要】 【目的】旨在研究采前不同覆膜处理对‘纽荷尔’脐橙果实贮藏过程中品质的影响，为提高果实采收品质和耐贮性提供参考。【方法】在果实转色期，于脐橙植株树盘铺设黑色园艺地布（F1）、银黑色反光膜（F2）和透湿性反光膜（F3），以无覆盖为对照（CK），分析不同处理对树冠光照和土壤性质以及对果实室温贮藏0～120 d期间色泽、失重率、呼吸速率、腐烂率和糖酸等品质的影响。【结果】F2和F3处理能够提高‘纽荷尔’脐橙树冠内部的光照强度和反射率，同时还能有效调节树盘土壤的含水量和温度，为树体生长提供稳定的环境条件。果实贮藏期间，F2和F3处理的‘纽荷尔’果实的a*值（红色程度）和柑橘色差指数（CCI）均明显高于F1处理和对照组（CK）果实，表明F2和F3处理能够更好地保持果实的色泽鲜艳度，显著提升果实外观品质。但是这2种处理的果实b*值（黄色程度）、H°（色调角）和L*值（亮度）相对较低。此外，F1处理增加了果实腐烂率，F2处理则降低了果实腐烂率。2种处理对果实失重率均无显著影响。F3处理不仅显著降低了果实的腐烂率和失重率，还提高了贮藏前期果实的呼吸速率。果实品质分析表明，F2和F3处理提高了果实中可滴定酸（TA）、可溶性固形物（TSS）和维生素C(Vc)含量，而F1处理对上述果实品质指标无明显影响。果实糖组分分析表明覆膜处理均显著增加果实采收时的果糖、葡萄糖和蔗糖含量。随着贮藏时间的延长，糖组分含量总体呈下降趋势：其中F1处理的果实中果糖含量低于对照，葡萄糖含量高于对照，蔗糖含量与对照无差异；F2处理的果实中葡萄糖含量高于对照，果糖和蔗糖含量与对照无差异；F3处理的果实中3种糖组分含量往往最高。不同覆膜处理对果实有机酸含量的影响并不明显。【结论】采前F3处理能够显著提高‘纽荷尔’果实在贮藏期的色泽、TA、TSS、可溶性糖（果糖、葡萄糖和蔗糖）以及Vc含量，有效提高‘纽荷尔’果实的品质，同时有效降低果实的腐烂率和失重率，从而提升果实的耐贮藏性。更多还原

【Abstract】 [Objective]This study aims to investigate the impact of different preharvest mulching on the fruit quality of ‘Newhall’ navel orange fruits during storage,thus providing reference for improving the harvest quality and prolonging storage period of citrus fruit.[Method]Three mulching including black gardening cloth(F1),silver black reflective film(F2),and moisture permeable reflective film(F3)covered the tree disk at the fruit color transition period,and no covering-material was used as the control(CK). The effect of different mulching treatments on light and soil properties,fruit color,weight loss rate,respiration rate,decay rate,sugar and acid contents were assessed over a storage period of 0-120 d at controlled room temperature.[Result]F2and F3 treatments improved light intensity and reflectance within the tree canopy,thereby promoting the development of fruits inside the canopy.Additionally,both treatments effectively regulated soil moisture content and temperature,offering more stable environmental conditions for the growth of fruit trees.During fruit storage,the a* value(red intensity)and citrus color index(CCI)of fruits treated with F2 and F3 are significantly higher than those of F1 treatment and the control group(CK),indicating that F2 and F3 treatments can maintain the fruits vibrant color,and enhance their visual quality.However,the b* value(yellow intensity),H°（hue angle）,and L* value(brightness)were relatively lower in fruits treated with F2 and F3.Moreover,F1 treatment increased the fruit decay rate but F2 treatment reduced the fruit decay rate.Both treatments had no significant effect on fruit weight loss rate.F3 treatmen not only significantly reduced the fruit decay rate and weight loss rate but also increased the respiration rate in the early storage stages of ‘Newhall’ navel orange fruits.Fruit quality analysis showed that both F2 and F3 treatments significantly increased the contents of titratable acidity(TA),total soluble solids(TSS),and vitamin C(Vc)of the ‘Newhall’ navel orange fruits,while the F1 treatment had no remarkable effect on these indicators.Analysis of sugar components revealed that the three mulching treatments significantly increased the levels of fructose,glucose,and sucrose in ‘Newhall’ navel orange fruits at harvest.These sugars decreased with the extension of storage time.The fruits treated with F1 had lower fructose content and higher glucose content than those of the CK,and sucrose was not different from that of the CK.The fruits under F2 treatment accumulated higher glucose contents,but no difference in fructose and sucrose contents compared with that of the CK.The fruits under F3 treatment always had the highest contents of fructose,glucose,and sucrose during all storage stages.However,the three mulching treatments showed no significant effect on the organic acid content.[Conclusion]Preharvest F3 treatment significantly improved the fruit color and increased the accumulations of TA,TSS,Vc,and soluble sugars including fructose,glucose,and sucrose in ‘Newhall’ navel orange during storage,and contributed to the improvement of fruits quality.Additionally,it can effectively improve the quality of ‘Newhall’ fruits while significantly reducing the decay rate and weight loss rate,thereby enhancing their storage durability.更多还原