Studies And Simulation On The Species Flow Of Psychotria Rubra And Melicope Pteleifolia

Species flow refers to the movement of plants across the landscape,the movement of plants through the expansion of the body,relying on species flow and mobility to move to the new location.Species flow is a form of landscape function that is an important process of ecosystems that expands and strengthens the communication and association between different ecosystems.It is of practical significance to study the migration and diffusion of species flow in forest landscape and to make full use of natural forces to improve and improve forest landscape structure and service function.The Psychotria rubra and the Melicope pteleifolia is China's native plants.It has some features:suitable health,fast,economic,beautiful characteristic etc.and they are the dominant tree species of the southern forest shrub layer.In this paper,I selected five plots of Guangzhou Baiyun Mountain Forest Park,South China Agriculture University's Arboretum,Guangzhou Cha Mountain,Taishan C ity,Guangdong Province,Shihuashan Forest Park,with an area of 6600 square meters.The shrub layer of Psychotria rubra and Melicope pteleifolia's individual preservation density and coverage are different.The spatial distribution pattern,species flow characteristics and diffusion rate of t he plot were analyzed by using Excel,SPSS and arc Gis,and the ecological characteristics,the spatial distribution pattern,the flow rate of species and the diffusion rate were discussed.The species flow pattern of forest landscape shrub layer was discussed,Landscape construction and function to enhance,to provide theoretical basis.Research indicates:?1?Different types of plots of different layers of wood,the shrub layer of the nine and three sarcophagus of the individual to save the density and coverage of significant differences.In the sassafras forest landscape that shurb is mainly Psychotria rubra?31600 trees/hm²?>Cratoxylum cochinchinense?Lour.?Bl.forest landscape patch block?7860 plants/hm²?>C henopecarpa-Camellia oleifera mixed landscape forest?3800/hm²?,which is the upper layer of the tree.?2750 plants/hm²?>Schima superba?Pinus tabulaeformis?,which is composed of mixed fungi of Pinus sylvestris var.Wet pine mixed landscape forest?2200/hm²?.?35.13%?>chashan?24.61%?>Baiyun Mountain?14.11%?>Arboretum?8.61%?.Melicope pteleifolia coverage for Baiyun Mountain?14.13%?>Arboretum?5.59%?.?2?The Psychotria rubra'sand the Melicope pteleifolia's population are increaseing,Simulation of the construction of 2 dominant shrub species growth model:nine plant height?y₁?,crown?y₂?,plant height?y₃?,Evodia crown?y₄?and diameter?x?growth model available quadratic function simulation.These model are y₁=1.019x²-0.083x-0.254;y₂=0.451x²+0.007x+0.033;y₃=0.926x²-0.020x+0.078;y₄=0.560x²+0.007x+0.107.?3?The Psychotria rubra'sand the Melicope pteleifolia's population structure are grouth.the distribution characteristics is aggregate distribution.Psychotria rubra'sand Melicope pteleifolia's population size showed the largest proportion of young trees in the age of the tree,the proportion of older trees the smallest proportion o f Pyramid structure,so they showed that the nine day and population are in growth state of Evodia lepta.The Psychotria rubra'sand the Melicope pteleifolia's population spatial distribution structure showed aggregated distribution.The aggregation degree d ue to the main story and the origin of interference in different ways,and show the difference.?4?The flow diffusion dynamics of the species in the 2 species of shrub patches are mainly transmitted by gravity,and the propagation direction is downhill.?5?Simulation of 2 kinds of shrub plaque species flow diffusion rate,fitting law is polynomial function,can get the diffusion rate of Psychotria rubra is y=20.046x³-14.726x²+1.16x+195.567,and the diffusion rate of Melicope pteleifolia is y=6.929x²-1.781x+51.318...