Simulation study on root growth of ecological revetment vegetation based on L-system
[Objective]As a living engineering material,the root system of ecological revetment vegetation limits the displacement and deformation of soil by bearing tension when the slope soil is unstable and deformed,improves the shear strength of soil and ensures the stability of bank slope.The construction of plant root model based on L-system has been well studied in the fields of biological science,agriculture,forestry,horticulture and so on.However,the related research has not been carried out in the simulation of root growth of ecological revetment vegetation.[Methods]Based on the characteristics of plant habitats in the eco-logical revetment area,a three-dimensional growth model of plant roots in the ecological revetment was established based on L-system,and the growth rules of plant roots considering axial growth and lateral branching of roots,slope gradient,height of in-filtration line,random free bending of roots and geotropism were constructed;then,a three-dimensional modeling program of the plant roots was developed by using Matlab;finally,the model was calibrated by using the relative error of root surface area densi-ty as an example for the cynodon dactylon-weeping forsythia-ulmus pumila L vegetation type on both sides of the slope of the Lianshi Lake section of the Yongding River in the North China Plain as an example.[Results]The result showed that the surface area density of cynodon dactylon root scanning was 7.62 cm2·dm-3,and the root surface area density calculated by the model simulation was 10.48 cm2·dm-3,with a relative error of 37.5%.The surface area density of weeping forsythia root scanning was 11.01 cm2·dm-3,and the root surface area density calculated by the model was 15.28 cm2·dm-3,with a relative error of 38.78%.The surface area density of ulmus pumila L root scanning was 11.96 cm2·dm-3,and the root surface area density cal-culated by the model was 16.26 cm2·dm-3,with a relative error of 35.95%.[Conclusion]The result showed that the relative errors of the root surface area density of the three vegetations of the herbaceous plant cynodon dactylon,the shrub plant weeping forsythia and the tree plant ulmus pumila L were all below 40%,which was in line with the expected result,indicating that the established model can better reflect the root morphological structure of the grass-shrub bridge vegetation type.The image genera-ted by the program is very close to the root scanning graph in the overall trend and morphological distribution of the root system,indicating that the developed program can well realize the established model.Through the comparative analysis of the case,the reliability and validity of the model are verified,the adaptability of the roots to the revetment habitat is revealed,and a scientific method is provided for the plant configuration of the ecological revetment project.
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