Effect of Aquatic Macrophytes Interaction on Water Purification of Artificial Floating Island
Date Issued
2006
Date
2006
Author(s)
Shih, Po-Kang
DOI
zh-TW
Abstract
Artificial floating islands not only contributed greatly to biological habitat, landscape environment, bank protection, and aquatic cultivation, they also enhanced water purifications. 32 floating islands made from bamboo and 38 made from polyethylene were constructed in the pond of An-Kang Farm, NTU. The growth states of 20 aquatic macrophyres were observed weekly from August to November, 2005. Juncus effusu, Vetiveria zizanioides, Phragmites karka, Schoenoplectus validus, Typha orientalis, Cyperus malaccensis, Eleocharis dulcis, and Bacopa monnieri had significant growths with specific growth rate of 0.034/day, 0.022/day, 0.030/day, 0.024/day, 0.033/day, 0.034/day, 0.025/day, and 0.024/day, respectively.
Three kinds of aquatic macrophytes, Typha orientalis, Juncus effusus, and Bacopa monnieri were chosen for laboratory experiments which were cultivated individually or mixed. Every pair of the three species was mixed in three kinds of different assemblages. The small-scale models of artificial floating islands were set up in the buckets. The growth state and water quality were observed weekly for three months. The competition coefficients of Bacopa monnieri which had positive effect on Typha orientalis and Juncus effusus were -0.32 and -1.01, respectively. The competition coefficients of Typha orientalis and Juncus effusus which had little effect on Bacopa monnieri were -0.07 and 0, respectively. In addition, there was negative effect of Typha orientalis on Juncus effuses which had a competition coefficient of +0.32.
In water purification, aquatic plants absorb nutrition from water. In single planting, the nitrogen absorption of Typha orientalis, Juncus effuse, and Bacopa monnieri were 17.5%%, 25.7%, 5.1%, and the phosphorous absorption were 13.1%, 22.6%, and 7.6%. In mixing planting, the nitrogen and phosphorous absorption of Typha orientalis and Bacopa monnieri mixing planted were 21.0% and 17.2%; Juncus effuse and Bacopa monnieri mixing planted were 26.0% and 23.4%, respectively.
Subjects
人工浮島
水生植物
交互作用
水質淨化
Artificial floating island
Water Macrophyte
Interaction
Water purification.
Type
thesis
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