Effect of nutrient eluted from hedoro brock on growth and survive of Brown algae sprouts

黑多罗岩洗脱养分对褐藻芽生长和存活的影响

• 批准号: 09660197
• 负责人: MORINAGA Tsutomu
• 金额: $ 1.15万
• 依托单位: Tokyo University of Fisheries
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09660197/
• 关键词: Survival-type seaweed reef; sea-bottom sediment (hedoro); nutrient-elution; compression strength of baseplate; Brown algae

I Results of laboratory experiment (in a year of 1997)When each sample of blocks submerged in filtrated seawater during the 28 days, hedoro nutrient in the solution increased with time, and in particular, amount of NOィイD23ィエD2ィイD1-ィエD1-N and NOィイD22ィエD2ィイD1-ィエD1-N reached saturation on the 10 th day. Lower the cement ratio is, for instance, fragiler the block makes, the concentrations of NHィイD24ィエD2ィイD1+ィエD1-N and POィイD24ィエD2ィイD1-ィエD1-P eluted inside are higher. The growth ratio of gametophyte as well as sporophyte of brown algae Eisenia bicyclis was the greatest in case of the solution showing the least cement ratio of 30%. On the other hand, the survival ratio of algal sprouts decreased linearly with time, and in case of the solution for hedoro block, the ratio of decrease stood for smaller than that for mortal one.II Results of outdoor experiment (in a year of 1998)Diatom inserted in the surface of each specimen block, and Brown algae Eisenia bicyclis did not live there.In future, such a research would be tried again when we make the hardness of block greater.

一、室内试验结果（1997年）各试块在过滤海水中浸泡28 d后，溶液中的营养盐含量随时间增加，特别是NO_（23）、NO_（22）、NO_（23）、NO_（水泥比越低，例如砌块越脆，内部溶出的NHイD24 D2イD1+ D1-N和POイD24 D2イD1-D1-P的浓度就越高。在胶结率最小的30%溶液中，双环叶甲配子体和孢子体的生长率最大。另一方面，藻芽的存活率随时间呈线性下降，在Hedoro块溶液中，其下降幅度小于致死性藻芽。II室外实验结果（1998年）每个标本块表面都有硅藻，没有褐藻双环藻生长，今后，当砌块的硬度增大时，可以再次进行这种研究。