Productivity Comparison of Two Duckweed Species (Lemna perpusilla and Spirodela polyrrhiza) Cultured under Various Environment

養在不同環境下兩種浮萍的生產力的比較

Sana Bouda ； 陳瑤湖(Yew-Hu Chien)

《臺灣水產學會刊》 32卷2期 (2005/06) Pp. 149-157

https://doi.org/10.29822/JFST.200506.0005

摘要

浮萍是最具生產力的植物之一，它的成長常被研究是因為它是處理家庭或農業廢水的一種污染吸收生物或者是因為它是陸生與水生動物的糧草。本研究比較台灣最常見的兩種浮萍Lemna perpusilla及Spirodela polyrrhiza當培養在不同環境：冬天(15.9±2.3℃)或春天(23.1±1.2℃)，有或無底泥，以及有或無施肥21天後的生產力。在冬天L. perpusilla的生產力比S. polyrrhiza高出155%。浮萍在春天的生產力比在冬天高出四倍多。底泥是營養的穩定供應者，因而導致有底泥存在之浮萍的生產力比無底泥者高出五倍多。以目前劑量施肥一次對水中氮類營養及浮萍生產力並無效應。浮萍本身過度擁擠會明顯阻礙生產力的增加，儘管其他的環境因子是有利的。當為了生產糧草養殖浮萍，除了要選擇具生產力的種類外，適當的季節，底泥所能提供的營養，以及例行的收穫皆應考慮在內。

關鍵字

浮萍 ； Lemna perpusilla ； Spirodela polyrrhiza ； 生產力 ； 底泥 ； 營養 ； 季節

並列摘要

Duckweed is one of the most productive plants. Its growth is often studied as a pollutant absorber for the disposal of sewage or agriculture effluent or as a fodder for terrestrial and aquatic animals. In this study, the productivity of Lemna perpusilla and Spirodela polyrrhiza, two of the most found duckweed species in Taiwan, was compared when cultured for 21 days in various environment: winter (15.9±2.3℃) or spring (23.1±1.2℃), without and with the presence of sediment, and without and with fertilization. It was found that L. perpusilla had 155% higher productivity than S. polyrrhiza in winter. The average duckweed productivity in spring was four times higher than that in winter. Sediment was a steady nutrient provider and consequently resulted in duckweed productivity in presence of sediment five times higher than that in absence of sediment. One-time fertilization at present rate did not have effects on nitrogen nutrient in water nor duckweed productivity. Overcrowding of duckweed itself could significantly prohibit productivity increase despite the other environmental factors were favorable. While growing duckweed for fodder use, besides productive species should be chosen, optimal growing season, contribution of nutrients from sediment, and routine harvesting should be also taken into account.

並列關鍵字

Duckweed ； Lemna perpusilla ； Spirodela polyrrhiza ； productivity ； sediment ； fertilizer ； season