Effects of density transformation on microenvironment and spectral characteristics of Fuji orchards in Xinjiang
[Objective]To explore the effects of density transformation on canopy temperature,relative humidity,light intensity and canopy reflection spectrum in closed Fuji orchards,so as to solve the problems of reduced orchard productivity,decreased fruit quality and low comparative benefit.[Methods]The old and inefficient closed Fuji orchards in Akesu,Xinjiang were taken as the test object,the temperature,relative hu-midity,light intensity and canopy reflectance spectra in the canopy of the fruit trees under density transforma-tion and normal pruning were compared,and the differences were analyzed to explore the effects of density transformation on the microenvironment and spectral characteristics of the Fuji orchards in Xinjiang.[Results]The light intensity of the canopy was higher than that of the control(especially the upper canopy).Compared with the control the apple orchard density transformation had a significant effect on the canopy temperature and humidity(P＜0.05).The relative light intensity of the same tree crown was higher than of the control,and the upper relative light intensity difference reached a significant level(P＜0.05).The reflectance of different light quality of the canopy reflectance increased in different degree after the tree density reconstruction.(Conclu-sion]The density transformation significantly reduced the temperature and relative humidity in the canopy,and the light intensity in the four directions,east,west,north and south in the canopy was improved to differ-ent degrees compared with the control,and the reflectance of different light qualities in the canopy reflection spectrum was also increased significantly.The density transformation can significantly improve the ventilation and light transmission conditions and the distribution mode and intensity of light quality in orchards.
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