The Relationship Between Leaf Traits And Photosynthetic Characteristics Of Salix Babylonica Under Different Water Gradients

Plant leaf and leaf traits are important indicators for measuring plant growth status,affecting the degree of plant access to light,water and other resources.The correlation between plant leaf and leaf traits and photosynthetic characteristics is helpful to understand the relationship between photosynthetic product distribution and energy distribution in plant leaves.The changes of plant leaf and leaf traits reflect the growth countermeasures of plants to some extent.Different soil water content creates different light conditions for plant communities,forming different canopy morphology,branchlet configuration and branch and leaf biomass allocation patterns,and significant effects.Plant leaf and leaf traits,physiological and biochemical characteristics,analysis of the relationship between plant leaflets and photosynthetic characteristics under different water gradients,which is helpful to understand the internal structure distribution of plants under different habitats,and the characteristics of plant acquisition and utilization of space resources under habitat changes.It has important theoretical value for revealing the regulation between species resources under different growth conditions.In view of this,this paper takes the Salix babylonica population of Jinchuan Jinshui Lake National Wetland Park in Jinchang City,Gansu Province as the research object,and analyzes the growth characteristics and canopy of weeping willow population under different soil water gradients by power function regression analysis.The relationship between configuration characteristics,leaf traits,leaf traits and photosynthetic characteristics(Net photosynthetic rate,Pn;transpiration rate,Tr)revealed the phenotypic plasticity and physiological and ecological mechanisms of weeping willow branches.The results show:(1)There were significant differences in canopy canopy area and canopy thickness between different water gradients(P < 0.05).As the canopy area increases,the thickness of the canopy canopy gradually decreases,that is,the large canopy thickness and the small canopy area are selected in the near water area,and the "narrow-shaped" canopy shape formed in the far water area is formed.The "horizontal" canopy morphology of small canopy thickness and large canopy area.(2)There were significant differences in the structural characteristics of weeping willow twigs under different soil water gradients(P < 0.05).The soil water content increased continuously,and the leaf area and branch length of the branchlets increased significantly.The leaf thickness,branch diameter,branching angle and the number of branchlets decreased significantly.In the three plots,there was a significant negative correlation between the total leaf area of the branches and the stem cross-sectional diameter(P < 0.05),and the stem section diameter was smaller in the plot I,and the plot III was larger;There was a significant difference in area and total leaf weight and stem weight.(3)Under the condition of given shoot size,the weeping willows with large water content increased,the total leaf area and small leaf strength of weeping willows were selected.In the place of light stress,the total leaf area was relatively reduced.Small,choose a larger leaf strength.(4)There is a synergistic relationship between leaf length and width,leaf vein density and midvein diameter as soil water content decreases.The weeping willows growing in the plot I increased the leaf length and leaf area,selected a lower leaf vein density and a larger midrib diameter,which improved the light interception ability of the leaves;the weeping willows grown in the plot III expanded the width of the leaves while The leaf thickness was increased,and the construction method of increasing the leaf vein density and reducing the diameter of the midrib was selected to achieve high net photosynthetic rate and transpiration rate.The relationship between plant leaf traits and photosynthetic characteristics is affected by soil water content.Due to different soil water content,the differences in light conditions of the community,and further affecting branch traits,leaf morphology and leaf vein traits,plant photosynthetic characteristics also occur.The differences in plant leaf and leaf structure and functional traits lead to the selection of different optimal growth patterns,which are also the inevitable result of plant niche differentiation and compensation.