| Ornamental ferns are one part of ornamental foliage plants, which are characterized with such functions as beautifying, greening, coloring and purifying environment. Because of above characteristics and shade-tolerance for which they can be adapted to grow well in shading area, they have been increasingly favored and appreciated. In this paper, studies on the utilization of the ornamental ferns were conducted, which will be certainly beneficial to richening planting resources for landscape, to improving the ornamental value of landscapes, to expanding the space of greening, which will result in the diversities of landscapes and bio-diversities in city-landscape and city-forestry, and in considerable economic and ecological benefits. This study will mainly focus on the introduction and domestication, propagation techniques, the shade-tolerance of ornamental ferns and their ability of absorbing aldehyde (HCHO). The main results are showed as follows: 1. Introduction and selection of ornamental fernsBased on the theory of "the similar climate" and the principle of "correspondence match", 45 species of ornamental ferns were introduced, including such different sizes in height as large, middle and small. The prospective ornamental ferns which were adapted to the sub-tropical and warm temperate zone in China were selected, including Angiopteris fokiensis, Osmunda vachellii, Cibotium barometz, Woodwardia prolifera, Pteris vittata, Dryopteris whangshanensis , Woodwardia japonica, Asplenium wrightii, Pteris ensiformis var. victoriae, Pteris multifida, Cyrtomium fortunei, Colysis elliptica , Osmunda japonica, Nephrolepis auriculata, Humata tyermanni , Adicmtum capillus ,Neolepisorus ovatus and Sellaginella tamariscina, after the experiments on cultivation and domestication of ornamental ferns, based on which the evaluation indexes system of ornamental ferns were established.2. Propagation of ornamental ferns(1) Persistent petiole cutting propagation of Angiopteris fokiensisBased on the experiments on cutting of Angiopteris fokiensis, effects of petiole of different ages, different substrate and different concentration of ABT-6 on the survival rate and growth situation of Angiopteris fokiensis were studied. The results were showed that the survival rate was over 90%, when cultivated in the substrate (a mixture of the garden soil and peat-soil with the same volume), or in the garden soil. The seedlings developed from cuttings of persistent petiole of 4 to 7 years old grew well. There were little difference in growth situation among cuttings, which dipped in the liquid of different concentration of ABT-6 for four hours.The height was 25.5 cm, after cultivated one year, while the leaf number was 2.9. The number of leaf was more than 5 and the length of leaf was 25.5 cm, after two-year cultivation, and the plant formed a good shape, thus can be used for landscaping.(2) The sexual reproduction of Cibotium barometzBased on the experiments carried in three different culture boxes with different temperatures of 22癈, 25癈and 28癈 and the light intensities of 14501x, 26001x and 38001x correspondently, the effects of different substrates, densities, different concentrations of GA and baron-acid on germination of spores and growth situation of prothallium of Cibotium barometz were studied. The results were showed that the germination rate of spores was the highest when cultivated in the forest soil under the temperature of 28癈 and light intensity of 38001x, which was 1.79 to 1.91 times of the germination rate when spores were cultivated under other conditions. The germination rate of spores cultivated with density of 1000 to 1500 per cm2 was better than that of spores cultivated with densities of 2000 to 2500 per cm2 and 2500 to 3000 per cm2. The germination rate of spores, treated with GA in density of 15mg/kg, was a little bit higher than that of spores treated with 30mg/kg GA and that of spores treated with water. The transform rate from prothalliums to young sporophytes was less than 5%, which was very low.
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