Study On The Correlation Between Leaf Structure And Carbon Fixation And Oxygen Release And Humidity Increase And Temperature Reduction In Different Parts Of Canopy

The anatomical structure,transpiration rate,photosynthetic rate and crown microenvironment of the four layers of the middle,outer layer,middle layer and inner layer of the central part of the canopy were studied by using two kinds of garden trees of Euonymus bungeanus(trees)and Lonicera ruprechtiana(shrubs).The relationship between leaf anatomical structure and microenvironment,carbon fixation and dehumidification and cooling capacity was discussed.The reasons for the different ecological functions of carbon sequestration and transpiration of leaves in different parts of canopy were clarified.Which provided the basis for improving the ecological function and ecological function evaluation of garden trees.1.Changes of leaf anatomical structure in different parts of crown(1)The characteristic parameters of leaf anatomical structure of of the surface of Euonymus bungeanus were compared with those of the other layers: from the outer layer to the inner layer of leaf thickness,leaf upper and lower epidermis thickness,palisade tissue thickness,thickness of spongy tissue than surface is decreased by 0.09%-0.35%,0.08%-0.23%,0.08%-0.28%,0.10%-0.46% and 0.06%-0.47%,leaf upper and lower epidermis stomata size were decreased by 3.23%-23.84% and 2.32%-19.30%.The leaf thickness,leaf upper and lower epidermis thickness,palisade tissue thickness,thickness of spongy tissue than surface of Lonicera ruprechtiana is decreased by 0.29%-0.41%,0.05%-0.25%,0.19%-0.35%,0.21%-0.36% and 0.44%-0.48%,the leaf epidermis stomatal size decreased by 11.22%-34.20%.(2)There were significant differences in the anatomical structures of the leaves of 2 species of garden plants.The anatomical characteristics of Euonymus bungeanus for the epidermal cell thickness,mesophyll cell thickness,leaf thickness,transmission tissue thickness,and pore size showed a gradually decreasing trend from surface to inner layer.The number of stomata per unit area showed a decreasing trend from the outer layer to the inner layer.The anatomical structure of Lonicera ruprechtiana for the leaf thickness,leaf cell thickness and mesophyll cell thickness showed a tendency to decrease gradually from the surface to the inner layer.As the transport organization of the xylem and phloem basically showed a gradual increase from the surface to the inner layer of the trend.Compared with the average value of the crown in different parts of the crown,near the middle position of the crown outer layer is closer to theaverage value of whole plant.Both Euonymus bungeanus and Lonicera ruprechtiana have the same results.2.The relationship between leaf anatomy and microenvironment in different parts of canopyThere was a significant positive correlation between the thickness of the epidermis and stomatal conductance in different parts of the crown.There was a significant positive correlation between the thickness of leaves and light intensity,air relative humidity,but negatively correlated with intercellular CO2 concentration.Palisade tissue thickness was positively correlated with air relative humidity,but was negatively correlated with intercellular CO2 concentration.There was a significant positive correlation between the thickness of sponge tissue and light intensity,air relative humidity,but negatively correlated with intercellular CO2 concentration.Xylem was significantly negatively correlated with light intensity and air relative humidity,but positively correlated with intercellular CO2 concentration.Leaf thickness was positively correlated with light intensity and air relative humidity,but negatively correlated with intercellular CO2 concentration.There was no significant correlation between the number of stomata and stomata in phloem and unit area.The results showed that the light intensity and air relative humidity played an important role in the internal structure of garden plants.Among them,the thickness of leaf,spongy tissue,palisade tissue,leaf epidermal cell thickness had a positive effect,but there was a negative impact on the xylem in the transport tissue.In addition,the intercellular CO2 concentration also had a great influence on the internal structure of leaf.However,there was no significant correlation between the number of stomata per unit area and the environmental factors in the phloem of the transport tissue.These changes may be caused by other internal structural factors or genetic factors.3.The relationship between leaf anatomical structure and carbon fixation,humidification and cooling in different parts of canopyAccording to the anatomical structure of the leaves of 2 tree species,there was a significant positive correlation between the thickness of leaf epidermal cells and carbon fixation and oxygen release.There was a significant positive correlation between the thickness of spongy tissue and the thickness of leaves in the mesophyll cells.There was a significant negative correlation between the xylem structure and carbon fixation and oxygen release in the transport tissue.There was a significant positive correlation between leaf stomatal size and carbon sequestration.There were significant correlations among other anatomical factors,such as the thickness of the epidermis,the thickness of the lower epidermis,the thickness of palisade tissue,the thickness of spongy tissue,the thickness of xylem,the thickness of leaf and the size of stomata.There was a significant positive correlation between the thickness of the lower epidermis cells and humidity increase and temperaturereduction.The thickness of mesophyll cells was significantly positively correlated with the amount of humidity increase and temperaturereduction.There was a significant positive correlation between leaf thickness and humidity increase and temperaturereduction.There were significant correlations among other anatomical factors,such as the thickness of the lower epidermis,palisade tissue thickness,spongy tissue thickness,leaf thickness,xylem and stoma size.The results showed that the ecological function of plants during the process of carbon fixation and oxygen release and humidity increase and temperaturereduction was influenced by the external environment factors also affected the internal structure,such as the thickness of the epidermal cells,the thickness of the sponge tissue,the thickness of the xylem,the stomatal size of the leaves,and so on.There were significant correlations between different survival environments and different canopy internal structures.The external environment affected the growth of the plant's internal structure.Due to changes in the internal structure of plants leading to changes in the ecological functions of garden plants.And then evolved more adapted to its external environment of the structural state.