揚(yáng)州地區(qū)挺水觀賞植物資源及其利用價(jià)值研究
[Abstract]:The unreasonable use of landscape plants and the eutrophication of urban water body have seriously hindered the development of the city, so it is urgent to rationally exploit and utilize the local ornamental plant resources and solve the eutrophication of water body. The main results are as follows: 1. Yangzhou is rich in tap water plant resources, including about 28 families, 62 genera and 92 species. Gramineae, Cyperaceae and Polygonaceae have the most species. 17 species such as water candle, reed and water peanut are the dominant species in wetland plant communities. 2. Ethnobotany evaluation results show that 20 native plants such as water candle, taro, scallion, Alisma orientalis and Sagittaria australis have high comprehensive utilization value and few or no application in urban landscape construction. According to the comprehensive important value analysis results, at the individual level, water candle, duck tongue grass, hairy grass dragon, Shilongrui, taro, wild Sagittarius and other plants have high application prospects; at the population level, silkworm cocoon, water candle, water onion, dwarf sagittarius, taro, Cyperus capitatum and other plants ranked high. Nitrogen had a significant effect on the biomass, root length and root activity of three kinds of water-tapping plants. Under the laboratory conditions, different concentrations of nitrogen had no significant effect on the weight of Anthurium hybridum and Sagittaria humilis, but the water content of Amaranthus decreased significantly under the high concentration of nitrogen. The root growth and root activity were significantly inhibited by all nitrogen concentrations, but the growth and root activity of Amaranth and Sagittaria were not significantly affected. 4. When the nitrogen concentration was higher than 44 mg/L, the root growth and root activity were significantly inhibited for 10 days. The chlorophyll content of Amaranthus chinensis decreased significantly after treatment, but decreased only when the nitrogen concentration was higher than 86 mg/L. Contrary to the former two cases, the chlorophyll content of Amaranthus chinensis increased significantly when the nitrogen concentration was higher than 23 mg/L. 5. The antioxidant enzymes activities of the three experimental materials were also found after 10 days of treatment with different nitrogen concentrations. When the nitrogen concentration was more than 86 mg/L, the SOD activity of D. hybrida and D. hybrida could be significantly increased; when the nitrogen concentration was more than 7.25 mg/L and 12.5 mg/L, the CAT activity of D. hybrida and D. hybrida could be significantly inhibited; when the nitrogen concentration was more than 7.25 mg/L, the POD activity of D of D. hybrida could also be significantly inhibited. When the concentration of nitrogen was more than 44 mg/L, the MDA content of the herb could be significantly increased. 6. Three kinds of plants could effectively remove the total nitrogen in the water with different nitrogen concentrations. The removal rate of amaranth was the highest in low concentration water, and that of hyacinth was the worst. In high concentration water, hyacinth was the highest and hyacinth was the worst. Compared with the other two kinds of plants, amaranth has a more significant effect on reducing the pH value of water body. The conductivity of water body with different nitrogen concentration shows an obvious upward trend after the treatment of agaricus, while that of amaranth and Sagittarius shows a significant downward trend. Nitrogen can affect vegetative growth by affecting root activity, water content and Photosynthesis of tappet plants. Nitrogen can also change the activity of antioxidant enzymes and MDA content of tappet plants. Compared with Sagittaria Sagittarius and Herba Hedyotis, amaranth has better purification effect and growth state.
【學(xué)位授予單位】:揚(yáng)州大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類號(hào)】:S682.32
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