| Different plant community units constitute the plant landscape and the structural characteristics of the plant community affect the quality of the plant landscape and the play of ecological functions.Based on the ecological learning of plants,it is of great significance to construct a scientific and reasonable community structure level to protect and beautify the natural environment and maintain the sustainable development of the ecosystem.In this paper,a secret beach of plant landscape of 40 samples of small watershed unit to investigate,through the study of plant species,ornamental and diversity,using the analytic hierarchy process(ahp)to a secret beach plant landscape selects 15 comments factor,from the landscape level,ecological level,practical level evaluation in three aspects,and get the relevant evaluation score.Then,it summarizes the problems of plant community landscape construction and puts forward relevant Suggestions and Suggestions for plant landscape optimization.Finally,the landscape drawing is made according to the proposal of the optimization scheme.The results are as follows:1.A field survey of plant communities in 40 sample plots in humen beach revealed that there were 107 species of plants,belonging to 90 genera and 40 families.Among them,there were 7 species of trees,7 species of shrubs and 93 species of herbaceous plants,accounting for 6.5%,6.5% and 86.9% of the total number of plants respectively.2.From the analysis of the horizontal structure of the plant community,the pure forest is mainly composed of the pure forests of poplar and birch composed of single broad-leaved plants,and the pure forests of larch,pinus tabularis,and spruce.Mixed forests are composed of qingyang + qinghai spruce mixed forest,qinghai spruce + north China larch mixed forest,qilian cypress + caragana.From the analysis of the vertical structure of the plant community,it can be seen that the qiao--grass type plant community has the largest number,accounting for 80% of the surveyed plant community.There is no structure type of qiao--irrigation,irrigation--grass and pure shrub forest.It can be seen that the application species and range of shrubs are too few,and the plant community structure is too single.3.Plant quantitative characteristic analysis,species ratio analysis of qiao irrigation,community without the ratio of tree to shrub > to 1;There were 3 communities with arbor to shrub ratio =1.There were 2 communities with arbor/shrub ratio <1.There were 32 shrub-free communities in the sample plots.There were 3 communities without trees,which were 7,39,and 40,respectively.According to the ratio analysis of the ratio of evergreen to deciduous leaves,the ratio of evergreen to deciduous leaves was 0.The ratio of evergreen to deciduous leaves <1 has 3;There were 8 evergreen to deciduous ratio =1;There were 19 all-evergreen communities and 7 all-deciduous communities.There are three more meadows.In the analysis of plant diversity,species richness and shannon-wiener diversity index were sensitive to species composition and changes in the region,followed by Simpson index and Pielou index.4.Based on the analytic hierarchy process(ahp),there are 15 comprehensive evaluation indexes of plant landscape from the aspects of landscape level,ecological level and practical level,to construct the "comprehensive evaluation system of plant landscape in the loess plateau region of qinghai province" and complete the comprehensive evaluation of 40 plant landscapes in the small watershed of humentan.The results showed that there were 2 plant landscapes of grade I,accounting for 5%.Reach level ? plant landscape has 16,40%;Level ? plant landscape has 18,accounting for 45%;Only a category ? plant landscape has four,accounting for 10%.According to the plant landscape comprehensive index evaluation classification standard definition,secret door plant landscape belongs to the whole beach valley ? level(medium)level.5.Combined with the comprehensive evaluation results and field research results of plant landscape in the loess plateau,the plant landscape was evaluated from the perspective of landscape level,ecological level and practical level;This paper proposes a set of plant landscape optimization schemes under different site types for the deficiencies and problems of plant landscape construction.Some plant landscape optimization models of plant community planting were summarized.Finally,the sample plots with poor comprehensive evaluation of plant landscape were further optimized,and the plant landscape in the study area was optimized and mapped from the watershed scale and slope scale. |
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