Study On The Growth And Water-submergence Adaptability Of Cynodon Dactylon Based On Macromolecule Medium

Since the construction of the Three Gorges Reservoir,it has brought about the seasonal fluctuation of water level of 30 meters,which has weakened the original ecological function,destroyed the ecological structure,reduced the plant diversity,and eroded the bank slope,thus causing soil erosion and directly affecting the operation and life of the reservoir.While the existing ecological restoration measures existed in the application of stress load is bigger,cost of renovation and construction is higher,and plant after water level change cannot regenerate,aggregate clearance fertility loss cause secondary pollution and other issues,therefore,a new ecological revetment engineering can be aimed at the existing problems in application of actual make reasonable improvement and adjustment.Based on the above problems,this paper provides a kind of composite anchor mat ecological slope protection technology,in order to plant growth of matrix polymer foam as the research object,and using the cynodon dactylon as the selecting organic plant,most suitable substrate condition is selected through the cynodon dactylon in different substrate under the condition of the ground part of the growth conditions.Under the condition of the optimum substrate for cultivating,physiological parameters such as soluble sugar,soluble protein,MDA and the physicochemical properties of the substrate before and after different waterlogging conditions were determined,and the adaptability of the plants to waterlogging and the stability of the substrate were analyzed.The main conclusions of the study are as follows:1)The germination rate of roots and the growth of the aboveground part were compared under different substrate conditions.The effect of porosity on the germination rate was the most obvious,followed by the proportion of slow-release fertilizer,and the effect of thickness and proportion of water retaining agent on the germination rate was less.When the porosity,the proportion of slow-release fertilizer and the thickness were higher,the growth performance of the aboveground parts such as plant height,leaf width and leaf length was better,while the amount of water retaining agent was vice versa.2)Soluble protein and soluble sugar in the root of cynodon dactylon decreased with the increase of waterlogging time.The content of MDA and proline increased with the increase of waterlogging time.The survival rate of the root decreased with the increase of waterlogging time,but the number of surviving plants in each quadrat was at a low level under both semi-submerged and total submerged treatments.According to the changes of the above physiological indexes,the physiological response of the root plants under the substrate condition was obvious to the waterlogging stress.In addition,with the increase of waterlogging time,the measured values of the physical and chemical properties such as tensile strength,bending strength,total nitrogen content and water absorption of the matrix changed little,and the effect on the overall stability of the matrix was not obvious.3)With the increase of water time,the related physiological parameters of cynodon dactylon recovered obviously,but the soluble sugar and soluble protein of cynodon dactylon under the substrate condition did not recover to the control level 45 days after water,except MDA and proline.This study illustrates the independent research and development of polymer foam substrate cultivation under the ground of cynodon dactylon in growth and water flooded the adaptability of the research results for the subsequent application in keeping with bank provide reference plant substrate improvement direction of ecological restoration,also for polymer foaming body in keeping with the application and popularization of providing a reference and theoretical basis.