| This paper studied the landscape quality of rhododendron forest in Daweishan,Hunan province based on the stand characteristic index,landscape pattern index,color patch change and beauty degree characteristics,constructed the aesthetic evaluation system and evaluation model of the landscape quality of rhododendron forest,and obtained the important factors affecting the landscape quality of rhododendron forest.The dynamic evolution prediction model of rhododendron forest landscape quality in Changzhutan area of Hunan Province was established by selecting four key characteristics,namely,the aggregate index,the gray-green patch area ratio,the beauty degree outside the forest,and the green ratio.In this way,suggestions on the landscape quality control of rhododendron forest in different regions of Hunan Province were put forward,which could provide theoretical basis and technical reference for improving and reforming the landscape quality of rhododendron forest.The main conclusions are as follows:(1)Study on gradient model of forest feature index of landscape quality in rhododendron forest.The best stands are those with medium density(1000～3000 plants/ha),green ratio of 40%～70%and more than 3 kinds of color richness.The rhododendron forest has the largest landscape beauty value and the best landscape quality.(2)Study on the relationship between main landscape pattern index and outlying beauty degree of rhododendron forest.The proportion of red patch area,red patch area/green patch area,red patch area and aggregation index had significant or extremely significant differences on the outlying beauty degree of rhododendron forest.(3)Study on the relationship between the change of color patch area and the outside beauty degree of rhododendron forest.When the area ratio of greenish-gray patches was at gradient 3:1,the area of dominant color patches accounted for 1/4 of the whole visual field area,the patches in the visual area were highly clustered,and the area ratio of the largest dominant color patches was at twice the gradient,the beauty degree outside the rhododendron forest was the highest.(4)Study on the relationship between color patch area change and major landscape pattern index.The change of major color patch area had significant effects on patch number(NP),patch density(PD),landscape shape index(LSI),maximum patch index(LPI)similar proximity percentage(PLADJ)and aggregation index(AI).(5)Comprehensive evaluation of rhododendron forest landscape quality.The order of the weight value of the aesthetic evaluation system of rhododendron forest landscape quality was color patch>beauty degree>landscape pattern index>stand characteristic index.When the change ratio of greenish-gray patch area was at gradient 3:1,the change ratio of dominant color patch area was at gradient 1/4,the degree of patch aggregation was at a high degree of aggregation,and the maximum dominant color patch area ratio was at 2 times,the comprehensive evaluation level of rhododendron forest landscape quality was the highest.This model can improve the landscape quality of rhododendron forest and provide effective scientific basis for improving the quality of rhododendron forest.(6)Suggestions on landscape quality of rhododendron forest regulation in different regions of Hunan Province.The aggregation index of all areas was controlled from 95.51～99.84,the area of green patches was controlled over 75%,and the area of gray patches was controlled about 15%.The area of green patches in community parks shall be controlled at least 75%,and the area of red patches shall be controlled at least 25%.The integrated park controlled more than 30%of red patches and reduced the degree of plaque fragmentation.In the natural ecological park,the green patch area should be controlled to 70%～80%,and the red patch area should be 20%,so as to increase the landscape patch density.The green proportion of rhododendron forest in different areas should be reduced appropriately,and controlled below 30%. |
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