| 不同光照和磷水平下两种沉水植物磷富集和钙磷含量的比较 |
| 摘要点击 1130 全文点击 431 投稿时间：2019-09-27 修订日期：2019-12-27 |
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| 中文关键词 沉水植物 钙磷 灰分磷 磷浓度 光照 |
| 英文关键词 submerged plant Ca-P ash phosphorus phosphorus concentration light intensity |
| 作者 | 单位 | E-mail | | 桑雨璇 | 湖北工业大学土木建筑与环境学院, 河湖生态修复及藻类利用湖北省重点实验室, 武汉 430068 | 929092705@qq.com | | 杨珈乐 | 武外英中学校, 武汉 430022 | | | 熊怡 | 湖北工业大学土木建筑与环境学院, 河湖生态修复及藻类利用湖北省重点实验室, 武汉 430068 | | | 尹文博 | 湖北工业大学土木建筑与环境学院, 河湖生态修复及藻类利用湖北省重点实验室, 武汉 430068 | | | 汪华 | 湖北省农业科学院植保土肥研究所, 武汉 430064 | wanghua4@163.com | | 王和云 | 湖北工业大学土木建筑与环境学院, 河湖生态修复及藻类利用湖北省重点实验室, 武汉 430068 | heyunwang2006@163.com |
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| 中文摘要 |
| 沉水植物光合作用形成的微环境有利于水体中钙和磷形成CaCO3-P共沉淀，将水体磷迁移到基质，避免植物腐烂后的二次污染.但沉水植物形成CaCO3-P共沉淀的能力依赖植物种类和环境条件.本研究以菹草和粉绿狐尾藻为研究对象，设置无机添加磷质量浓度（0、0.2和2mg·L-1）和光照强度[66 μmol·（m2·s）-1和110 μmol·（m2·s）-1]两个变量，测定其培养一周后植物相对生长速率、植株总磷、植株灰分磷和钙磷的含量，以比较不同植物富集水体磷的实际能力和植物腐败后对水体磷增加的影响.结果表明：①菹草在各种培养条件下的相对生长速率显著高于粉绿狐尾藻，在外源性磷质量浓度为2mg·L-1和光照强度为66 μmol·（m2·s）-1时，相对生长速率达到最大；②无机磷添加显著影响了两种植物的灰分总磷（菹草95.681%和粉绿狐尾藻85.432%），2种沉水植物灰分磷中Ca-P含量最高值均出现在高磷水平；③菹草的干重磷在各种处理下都低于粉绿狐尾藻，但是灰分总磷和Ca-P在高磷水平大于粉绿狐尾藻.结果表明，菹草、粉绿狐尾藻在生长期间均能有效吸收磷，但2mg·L-1质量浓度下菹草对水体磷的实际去除能力大于粉绿狐尾藻. |
| 英文摘要 |
| The micro-environment formed by the photosynthesis of submerged plants is conducive to the formation of CaCO3-P from co-precipitation of calcium and phosphorus in water, thereby permanently removing phosphorus from water to the bottom mud and avoiding secondary pollution after plants decay. However, CaCO3-P co-precipitation shows obvious specific-differences and environmental dependencies. In the present study, two different submerged plants, Myriophyllum aquaticum and Potamogeton crispus, were used as the research objects. Two variables, inorganic phosphorus level (0, 0.2, and 2 mg·L-1) and light intensity [66 μmol·(m2·s)-1 and 110 μmol·(m2·s)-1], were set. After cultivating for a week, the plant relative growth rate, plant total phosphorus, plant ash phosphorus, and Ca-P were measured to analyze the actual ability of phosphorus accumulation and clarify the effect of plant corruption on phosphorus increase in the water body. Results revealed that under various culture conditions, the relative growth rates (RGR) of P. crispus were significantly higher than those of M. aquaticum, and RGR reached the maximum at a P level of 2 mg·L-1 and a light intensity of 66 μmol·(m2·s)-1. The addition of inorganic phosphorus significantly affected plant ash phosphorus of the two plants (P. crispus 95.681%, M. aquaticum 85.432%), and the highest value of Ca-P content in the ash phosphorus of the two submerged plants appeared at a high phosphorus level. The total phosphorus in P. crispus was lower than that in M. aquaticum under various treatments, but the total ash phosphorus and Ca-P levels were higher than those in M. aquaticum. Consequently, M. aquaticum and P. crispus can effectively accumulate phosphorus during growth. However, the actual ability of P. crispus of removing phosphorus from water by the formation of CaCO3-P was higher than that of M. aquaticum at a P level of 2 mg·L-1. |
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