Research On Canopy Microenvironment Of Different Loquat Germplasm Growth Types

In this experiment,the compact type of loquat‘Fujian dwarf NO.1',the dwarf opening type of loquat 'dwarf dapoding No.3' and the dwarf thinning type of loquat' polyploid 43'were used as the experimental material to test from February 2016 to February 2017.Tree body growth type,tree structure and branch distribution,space shoot canopy micro environment and the photosynthetic characteristics.The results were as follows:1.The compact type of loquat,the dwarf opening type of loquat and the dwarf thinning type of loquat per plant shoot biomass were 588,136 and 239,the total amount of the dwarf opening type of loquat branches at least,and mainly concentrated in the periphery;Of compact type of loquat total branch amount was maximum,and distributed in the canopy;The dwarf thinning type of loquat had total branch center,included the central chamber and a small amount of distribution,mainly concentrated in the periphery.On the whole,the canopy distribution of the dwarf opening type of loquat was more reasonable than those of the compact type of loquat and the dwarf opening type of loquat.2.The canopy light intensity of tree different growth types showed a trend of increasing gradually from the bottom to the top.In the autumn shoots and flowering period,for the entire crown volume for different relative light intensity of the canopy volume proportion difference,the autumn shoot stage the compact type of loquat in different relative light intensity of canopy volume was 47.20%,the dwarf opening type of loquat was 60%,the dwarf opening type of loquat was 19.40%.The relative light intensity of flowering the compact type of loquat was 32.14%,and that of the dwarf flowering loquat was as high as that of the other,and that of the dwarf thinning type of loquat was 25%,which was less than 20%,and that of the loquat was less than that of the other two.The flowering stage and flowering stage were all significantly different from those of the dwarf type loquat,the compact loquat and the dwarf sparse branch loquat.The change of temperature and humidity in the canopy of different tree species in the early stage and the flowering stage was single peak curve.The variation of canopy temperature was higher than that of compact loquat and dwarf branch type loquat,and the change of canopy humidity was lower than that of compact loquat and dwarf branch loquat.The results indicated that the micro environment of loquat was not as good as that of compact loquat and dwarf branch loquat.3.The average leaf inclination angle and the scattering coefficient of the scattered radiation of different tree species were significantly different.The average leaf inclination angle and the extinction coefficient of the scattered radiation were the largest.The leaf area index showed that there was no significant difference between the dwarf loquat and dwarf branch loquat,but the difference was significant.The maximum value of leaf area index of the 3 growth types of loquat in the autumn stage was the compact loquat,loquat,loquat,loquat,loquat and dwarf loquat,which was 2.857 in the opening stage,and the other in the loquat tree was reduced to the size of loquat,which was less than 20%in the early stage of the growth of the plant type of the tree species in the late stage of the plant growth in the late stage of the autumn stage.Open type loquat dwarf scattering coefficient for radiation penetration was significantly greater than that of compact and dwarf type thinning of loquat loquat,in the autumn shoot stage maximum 3 tree growth type of loquat were compact loquat reached 0.11,opened 0.26 dwarf type loquat,loquat dwarf thinning type 0.15.The direct radiation transmission coefficient in the periphery of the tree crown is a dwarf sparse branch loquat,loquat loquat,loquat.In general,the canopy characteristics of dwarf type loquat and dwarf branch loquat were better than that of compact loquat.4.The different types of loquat tree germplasm growth and photosynthetic characteristics of loquat,compact net photosynthetic rate was the highest,dwarf and dwarf type thinning loquat loquat open type difference;The compact loquat transpiration rate and stomatal conductance of the highest opening type dwarf dwarf loquat center,thinning type loquat minimum.The comparison between CO2 cell concentration,compact intercellular CO2 highest concentration,dwarf thinning type,open type lowest dwarf.The results showed that the photosynthetic characteristics of compact loquat were the best,the dwarf type loquat was in the center,and the dwarf branch type loquat was poor.5.In color difference analysis,the L,a and b values were characterized by dwarfing,opening type,compact type,Dwarfing and sparse branch type.6.Dwarf and dwarf type opening thinning type at all levels,the chlorophyll content of the part of the performance with the increase of height and stem with farther distance from the center of the higher chlorophyll content,compact opposite.At the same time three tree growth type at all levels and parts of the chlorophyll content had no significant difference,showed dwarf the maximum thinning type,dwarf open type,compact minimum.7.The different types of loquat tree germplasm growth,leaf area index and transpiration rate showed a significant negative correlation,while the radiation coefficient and the transpiration rate and stomatal conductance showed significant positive correlation,the average leaf angle and net photosynthetic rate showed a significant positive correlation.