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钙离子添加对两种沉水植物富集水体磷的影响
陈琦, 王和云
湖北省武汉市洪山区湖北工业大学
摘要:
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,从而将水体中的磷永久性去除,避免植物腐烂后的二次污染。但不同的沉水植物种类形成CaCO3-P共沉淀的能力不同。本文以沉水植物菹草(Potamogeton crispus L.)和金鱼藻(Ceratophyllum demersum L.)为实验对象,研究水体中添加钙离子(0、100mg/L)对水体磷(磷浓度:0、0.2、2mg/L)的去除和植物富集磷的差异,并通过植物灰分磷的组分分析,聚焦植物钙磷的变化,为生态修复中沉水植物的选择提供理论依据。结果表明:(1)菹草和金鱼藻体系中TP和SRP浓度显著下降,添加钙离子使降幅升高,且菹草体系中水体TP和SRP降幅均高于金鱼藻TP和SRP降幅;(2)菹草的干重全磷在高磷低钙(2-0)水平最高,灰分总磷在高磷高钙(2-100)水平最高,而金鱼藻干重全磷在高磷高钙(2-100)水平最高,灰分磷在中等磷低钙(0.2-0)水平最高;(3)在2mg/L的磷浓度下,添加钙离子使菹草的HCl-P和H2O-P含量升高,NaOH-P含量降低,结果使灰分总磷升高,而金鱼藻NaOH-P升高,HCl-P和H2O-P含量均降低,结果使灰分总磷降低。这表明菹草通过提高吸附性磷和钙磷含量增强磷的富集,而金鱼藻则只显著升高了灰分中有机磷的含量。显然,水体富营养化背景下,相较于金鱼藻,菹草具有更强的形成CaCO3-P共沉淀的能力,具备竞争优势。
关键词:  沉水植物      磷富集  灰分磷  钙磷
DOI:
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基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
Effect of calcium addition on phosphorus enrichment capacity of two submerged plants in water bodies
chenqi, wangheyun
Hubei University of Technology
Abstract:
The micro-environment formed by 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 and avoiding secondary pollution after plant decay. However, CaCO3-P co-precipitation exists obvious specific-differences. Two different submerged species, Potamogeton crispus L. and Ceratophyllum demersum L. were chosen to study the calcium addition (0,100 mg/L) on phosphorus removal and enrichment capacity of the plants under different phosphorus concentration (0,0.2,2mg/L). And the phosphorus fraction of plant ashes and the change of HCl-P were analyzed in order to help to select the submerged plants for ecological restoration projects. The results revealed(1) P. crispus L. and C. demersum L. could effectively reduce the concentration of total phosphorus(TP) and soluble reactive phosphorus(SRP), the calcium addition increased the decrease amplitude, and P. crispus L. showed higher decrease amplitude than C. demersum L.; (2) For P. crispus L., the plant phosphorus content (dry weight) was the highest under high phosphorus and low calcium (2-0), while ash total phosphorus was under high phosphorus and high calcium (2-100). For C. demersum L., the plant phosphorus content (dry weight) was the highest under high phosphorus and high calcium (2-100), while ash total phosphorus was under medium phosphorus and low calcium (0.2-0);(3)When the phosphorus concentration was 2mg/L, for P. crispus L. the calcium addition increased the content of HCl-P and H2O-P, while decreased NaOH-P, resulting in the increase of the total phosphorus of plant ashes. For C. demersum L., the calcium addition increased the content of NaOH-P, while decreased HCl-P and H2O-P, resulting in the decrease of the total phosphorus of plant ashes. This suggests that P. crispus L. enhanced phosphorus enrichment by increasing the content of adsorptive phosphorus and calcium phosphorus, while the C. demersum L. only significantly increased the content of organic phosphorus in the ash. Obviously, P. crispus L. has a competitive advantage than C. demersum L. because of stronger ability to form co-precipitation of CaCO3-P under eutrophical water.
Key words:  Submerged plant  calcium  phosphorus  phosphorus enrichment  ash phosphorus  HCI-P
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