Studies on bio-production and water cleaning by floating culture plants

19941.从漂筏材料、漂筏大小、栽植方式、种类和施肥量等方面对漂浮养殖系统的基本技术进行了研究，确立了漂浮养殖的基本技术。2.从30个品种中筛选出最适合漂浮养殖的植物是美人掌和互花莎草。与其他植物相比，这两种植物的生物量都非常高。植物从池水中吸收的氮的重量高于从肥料中补充的氮的重量。漂浮养殖的美人掌和莎草池水中的NO3-N、NH4-N、全P和COD浓度低于未种植的池塘(对照)。美人掌的生长分析和光合作用也与两种栽培方式进行了比较。此外，几种BOT…栽培植物的根系形态特征漂浮培养的美人掌和莎草的生物量均显著高于土壤培养的。在漂流养殖中，美人掌和莎草的这一数值分别为4倍和5倍。尤其是美人掌对磷、钾的吸收较为活跃。美人掌漂浮培养的高生物量依赖于较大的叶面积产量和净同化率。较高的NAR是由于植株的高光合作用(Pn)所致。进一步的高Pn是由于叶电导和中叶电导较高所致，表现为叶肉细胞叶绿体中CO_2的固定效率。3.从根部横截面的显微照片看，漂浮栽培和土培栽培的一些植物。与土培植物相比，漂浮培养植物的根部有更多溶生型通风组织的形成。但该群系存在种间差异。溶生组织的形成与根的比重有较高的相关性。较少

19941.Standard basic technology of floating culture system was examined and established from the view point of raft material, raft size, planting method, kind and amount of fertilizer.2.It was made clear that the most suitable plant for floating culture was Canna indica L.and Cyperus alternifolis L.among 30 spesies tested. The both plants produced remarkably high biomass as compared to other plants. The weight of nitrogen absorbed by plant from the water in pool was higher than that of supploed from fertilizer.NO3-N,NH4-N,total P and COD concentration of the water in pool on whererice and wheet plants were grown with floating culture were lower than those of the non-planted pool (control).1995Biomass production and water cleaning of Canna and Cyperus grown with floating culture were examined in comparison with soil culture plants. Growth analysis and photosynthesis of Canna were also compared with both culture. Ferther, the morphological feature of root in several plants grown with bot … More h culture was compared.1.Biomass production of floating cultured both plants, Canna and Cyperus were remarkably higher than that of soil cultured them. These values in floating culture were 4 times and 5 times in Canna and Cyperus, respectly. Especially, Canna absorbed actively phosphorus and pottassium. Therefore, theis plant will become eliminator of both elements.2.High biomass production in floating culture of Canna depended on large leaf area production and net assimilation rate (NAR). HIgh NAR was due to high photosynthetic rate (Pn) of the plant. Further high Pn caused by high ability of leaf conductance and mesophhyll conductance which representas CO_2 fixzation effeciency in chloroplast of mesophyll cell.3.From the microphotograph of the cross section of root some plant species grown with floating and soil culture. More formation of lysigenous aerenchyma was cobserved in roots of floating cultureplants compared to soil culture plants. However, there was species difference of the formation. There was high correlation between formation of lysigenous aerenchyma and specific weight of root. Less