The Affect Of Climbing Nets On Morphology, Photosynthetic Physiology And Biomass Of Four Climbing Plants

Vertical greening gets actively developed under the attention of the government from all works of life. Because of its gorgeous modeling and being able to quickly form a good landscape effect, Green Wall and other high-technology vertical greening gradually become a trend. The issues, however, such as high cost and unsustainable development are still the existing problems. Climbing nets are common support of climbing plants in urban vertical greening, which has the characteristics of rich forms and diverse types. Providing to climbing plants the suitable climbing nets grid sizes, not only can increase the availability of illumination during the growth process of climbing plants, also can quickly realize green effect, while having a certain meaning to reduce the late maintenance and management cost, and can realize low-carbon green. In the course of urban vertical greening, climbing nets exist the phenomenons of unreasonable application and thoughtless in ecological design which are the reasons that lead to the single landscape form and lack of innovation in climbing plants. Therefore this study will take four climbing plants:Pyrostegia venusta, Quisqualis indica, Passiflora edulis, Passiflora edulis f. flavicarpa as the research object, and set different climbing nets grid sizes:5×5cm、7×7cm、10×10cm、12×12cm, and compare with the control that a support column with diameter 10cm, as well as determine growth dynamics, branching pattern, morphological characteristics, photosynthetic parameters, chlorophyll content, fresh weight, biomass, biomass allocation and other indicators of the four climbing plants, and discuss the difference of morphological characteristics, photosynthetic and modular biomass allocation on the plant of four grid sizes climbing nets, screening out a suitable environment for plant growth, and being better able to form landscape effect of grid sizes climbing nets, and providing theoretical basis and data supporting for its application in urban vertical greening. The main research results are as follows:(1) The influence of climbing nets on branching configuration index, morphological characteristics, photosynthetic parameters and biomass of four climbing plants has significant difference with CK. Supported by CK, the branching pattern of plant is against to leaves on light capture, low leaves chlorophyll content, poor photosynthetic capacity, leading that the accumulation of plant biomass, number of modular, the growth rate are poorer than climbing nets. Therefore climbing nets are more suitable than support column for the growing of four climbing plants.(2) The growth and morphological characteristics of four climbing plants indicate:Under the support of 10×10 cm grid sizes climbing nets, the modular numbers of climbing plants leaves, tendril, shoots, etc. are more, the growth rate of plant height,1st shoots length, petiole length, etc. are faster, and the average leaf area are larger, form a larger canopy area. Not only can enhance the capture of light, also can cover the climbing nets in a relatively short time to form good landscape effect.(3) Under the support of different grid sizes climbing nets, shoots pattern of the same kind of climbing plants has significant differences, which mainly reflect on each grade of shoots number and shoots length of the four climbing plants, followed by gradually branching ratio.1st shoots,2nd shoots and 3rd shoots which few and long, wrap climbing nets of Pyrostegia venusta, Passiflora edulis on large grid sizes climbing nets (10×10cm、12×12cm) grow high and rapidly, whose annual increment are bigger. Each grade of shoots number and length of Passiflora edulis f. flavicarpa are opposite to the above case. Each grade of shoots number and length of Quisqualis indica are variable sizes between climbing nets.(4)Under the support of 10×10 cm grid sizes climbing nets, climbing plants leaves Chl a, Caro and Chl total are the maximum, the daily average of Pn, Tr and Gs are also the maximum. Indicating that the four climbing plants with 10×10 cm grid sizes climbing nets disperse leaves a better light environment position, which increases the base of photo assimilate, improves photosynthesis of plants, thereby ensures that the good growth vigor and material accumulation of plants.(5) Under the support of each climbing nets, the morphological characteristics of four climbing plants is correspond to biomass accumulation. Under the support of 10×10 cm grid sizes climbing nets, the total biomass and above-ground biomass are the maximum, which indicates that under the support of 10×10 cm grid sizes climbing nets, it is conducive to the biomass accumulation of four climbing plants, also indicates that the capture capability of plants to resources such as light, water and nutrients is stronger.(6) The change of climbing nets grid has significant influence on branching pattern, morphological characteristics, photosynthetic physiology of four climbing plants, has less influence on fresh weight, biomass and biomass allocation.(7) Comprehensive the results that the influence of the climbing nets grid change on morphological characteristics, photosynthetic physiology and biomass, advice that is recommended to use climbing nets grid sizes is:10×10 cm.