Research On The Phenological Landscape Characteristics Of Common Garden Trees In Yangling Area

In this study,210 common garden trees in the Yangling Demonstration Area of Shaanxi Province were taken as research objects.According to the “China Phenobarometric Observation Method”,observations were made on the characteristics of their leafing,flowering,fruiting,discoloration of autumn leaves and defoliation.,get the following results:(1)The leaf opening of most trees is concentrated from mid-March to mid-April,accounting for about88% of the total.The duration of the exhibition leaf is concentrated in March and April,which is about 2months.The period during which the exhibition leaf flourished was larger in April,accounting for about74% of the total.(2)The flowering period of most trees is concentrated from early March to late May.The flowering peaks are concentrated from early April to late June.Among them,there are many types of trees in the late flowering stage in mid-April and late April.(3)From May to November,every month has fruit maturity.Among them,the number of fruit maturation periods was greater in mid-May,late May,mid-August,and early October.(4)The discoloration period of autumn leaves was concentrated in late October and mid-November.Among them,there were more types of trees that began to change color in late October.There were 37 species.(5)The initial period of defoliation was mostly concentrated from early October to mid-November,and there were fewer numbers in August,September and December.The late fall leaves are concentrated in early December and mid-November.(6)The color of the trees in the leaf development period is the largest in the green phase,accounting for about 65% of the total,followed by the yellow-green phase and the orange-grey phase group.There are few kinds of orange-red and red-phase trees,of which the yellow-green,orange-red and red-phase trees of the new leaves have better ornamental effects.(7)The flower color is distributed in nine hue groups of yellow,orange,orange,purple,pink,purple,violet,yellow-green and white.Among them,the number of red and white flowers is the largest,with 53 and 54 species respectively.Followed by the yellow flower,there are 34 species.The fewest are blue-purple flowers,only 10 species.(8)There are 63 species of trees with good robustness and ornamental quality,of which 35 are the most common types of red fruits,16 are yellow fruits,9 are blue-purple and only 3 are white..(9)A total of 68 species of trees are available for viewing autumn leaves.Among them,there are 43 species of yellow-colored autumn leaves and 25 species of red-colored autumn-leaved trees.Overall,the autumn leaves show more yellow trees.(10)The viewing time of the leaves of most trees ranged from 210 to 270 days.The number of trees with leaf viewing time of more than 270 was the smallest with only 8 species.(11)The flowering duration of most trees ranged from 0 to 30 days.There were 18 species of trees whose flowering duration lasted from 30 to 60 days.There were few tree species whose flowering duration lasted more than 60 days.There were only 9 species.(12)The viewing time of autumn leaves is mostly 10-40 days,occupying 90% of the total,and the number of trees during the viewing period 10-20 d,20-30 d,30-40 d is less.(13)There were 150 species of trees with good ornamental effect.Among them,the number of trees with medium-sized flowers was the largest,there were 78 species,55 species of trees with small flowers,and the species of trees with large flowers were only 19 species.(14)The number of clusters and dense floral phases in the flowers of the observed trees was relatively large,with 48 species and 46 species respectively.The total number of unique flower,line and dry flowers is less.