An Investigation on Green Hedge, Color-leaved, and Shade-tolerant and Plants Used in Parks of Taipei Region
Date Issued
2010
Date
2010
Author(s)
Chen, Chun-Hung
Abstract
A park is a place where residents can relax and exercise. It let people take a break and maintain an ecological environment. However, neighborhood parks in Taipei city are some problems such as selecting wrong plants, bad quality nursery, and improper management. These problems result in unhealthy and ill plants, and finally plants die.
Therefore the objective of this research is to investigate common hedge, color-leaved plants and plant species under shading in the parks of Taipei region. To analysis current growth condition of selecting plants in the parks is to suggest and find a proper management.
For application of common hedge plants in the parks according to planting length and using percentage, the most common is Duranta repens cv. Golden Leaves, and followed by Rhododendron spp., Ixora williamsii, Schefflera arboricola, Ficus microcarpa. cv. Golden Leaves, Murraya paniculata, Cordyline fruticosa, Ardisia squamulosa, Osmanthus fragrans and Phyllanthus myrtifolius. Based on five levels of ornamental quality from 5(fine) to 1(poor), the top three are Schefflera arboricola (3.56), Phyllanthus myrtifolius (3.35), and Duranta repens cv. Golden Leaves (3.32); the least two are: Rhododendron spp (2.69) and Murraya paniculata (2.83).
For application of common color-leaved plants in the parks according to using percentage and planting area, the top is Duranta repens cv. Golden Leaves, and followed by Ficus microcarpa cv. Golden Leaves, Cordyline terminalis cv. Aichiaka, Codiaeum variegatum, Ardisia squamulosa, Schefflera arboricola cv. Variegata, Acalypha wilkesiana, Excoecaria cochichinensis, Ophiopogon japonicus cv. Argenteo-Vittatus , and Chlorophytum bichetii. Based on ornamental quality, the order of ranking is Ophiopogon japonicus cv. Argenteo-Vittatus (4.53), Chlorophytum bichetii (4.46), Excoecaria cochichinensis (4.36), Acalypha wilkesiana (4), Duranta repens cv. Golden Leaves (3.74), and others falls between 3 and 3.5.
For application of plants under shading in the parks according to using percentage and planting area, the most common is Duranta repens cv. Golden Leaves, and followed by Osmanthus fragrans, Cordyline fruticosa, Ardisia squamulosa, Rhododendron spp, Schefflera arboricola, Ixora williamsii, Codiaeum variegatum, Sansevieria trifasciata cv.’Laurentii’ , Liriope Spicata. Based on using percentage, the high usage are Duranta repens cv. Golden Leaves, Osmanthus fragrans, Cordyline fruticosa, Ardisia squamulosa, Rhododendron spp, Schefflera arboricola, Ixora williamsii, Codiaeum variegatum ), Sansevieria trifasciata cv.’Laurentii’, and Liriope Spicata. Also,the ornamental quality from fine to poor are Sansevieria trifasciata cv.’Laurentii’(4.05), Liriope Spicata(3.7), Ixora williamsi(3.6), Ardisia squamulosa( 3.6), Duranta repens cv. Golden Leaves(3.55), Schefflera arboricola(3.5), Osmanthus fragrans(3.45), Codiaeum variegatum(3.45), Cordyline fruticosa(3.4), and the worst is Rhododendron spp (2.95).
According to these results, there are some suggestions to modify:
For the hedge plants, common problems are incompact banding hedges, free tree shape, hollow tree crown, sparse shoots and ill growth. First, the proper suggestion are exchanging ill growth plants, fertilizing and pruning regularly for promoting branching and maintaining the shape of tree crown. The large crown trees are regularly pruned to supply more light intensity to the hedges under trees. Cuckoo and Gardenia jasminoides should prevent from attacking of insect and disease. Second, selecting day-neutral plants and more shade tolerance plants are planted under shading environments. For the plans which have higher shoots such as Cordyline fruticosa, they are designed behind the shorter plants to increase arrangement and ornamental quality.
For color-leaved plants, common problems are bad coloration of leaves, sparse shoots, a little plant species, and disorder of arrangement. The proper suggestion are to select correct plant species according to growth requirement such as Duranta repens cv. Golden Leaves has better performance under strong light intensity, and Maranta has better performance in the shading environment. Spring Color Leaf plants may increase the times of pruning to branching and coloration of new shoot. According to investigation in 30 parks in Taipei region, there are only 39 perennial color-leaved plants and mainly yellow, purple, and red leaves color. It can select more color and type of color-leaved plants.
For plants under shading, these problems are selecting wrong plant species, bare soil surface and large spacing. The lower leaves of woody plants fall seriously, discoloration, chlorosis, sparse shoots because of insufficient light intensity. Pruning and fertilizing can resolve. Full sunlight results in leaf burned of herbaceous plants. Besides, at the edge of plants under shading, the neutral plants are more suitable for any environments. If using under shading, it is suggested that selecting shade tolerance of color-leaved plants can increase the variety of colors and enhance the quality of appreciation.
The result of the soil analysis in the parks shows that the average of pH value ranges from 6.87 to 6.93. And the soil EC value ranges from 172.9 to 207.8 μS/cm,which means insufficient nutrients. To enhance the growth performance, it is suggested to fertilize regularly.
Subjects
hedge planrs
color-leaved plants
shade-tolerant plants
ornamental quality
soil EC
soil pH
Type
thesis
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