中文摘要：

水体磷循环是水柱和对应的沉积物中发生的各种非生物和生物的磷迁移转化过程.与此同时,沉积物中钙通过沉水植物吸收和转运,从该类植物的叶面释放至水柱中,释放的Ca2＋与水柱中的CO23-一起形成碳酸钙.在这一过程中,水柱中少量溶解性磷分配在碳酸钙中形成CaCO3-P共沉淀,导致水体中可溶性磷向难溶性磷转化,这种由沉水植物驱动的水环境钙泵在水体磷循环中发挥着重要作用.研究证明,沉水植物菹草叶面上有CaCO3-P共沉淀的形成,且这种共沉淀的含磷量变化范围很宽.另一方面,新近沉积物中钙与磷的沉淀物存在一个由聚磷酸盐向磷灰石逐渐演变过程,而沉水植物叶面上的含磷共沉淀作用是否也存在由聚磷酸盐向磷灰石的变质过程,该过程在沉水植物生长期间是否发生关系到沉水植物除磷效果值得深入研究.本文从水体磷循环概述、钙在水体磷循环中的作用和沉水植物驱动的水环境钙泵假说及其在水体磷循环中的意义等方面综述了钙在水环境中的迁移对水体磷循环的贡献.

英文摘要：

Phosphorus cycle in water contains processes of various abiotic and biotic transformations of phosphorus in water column and corresponding sediments. Calcium in the sediment can be up-taken by submerged macrophytes and then released to the water column from the leaves, which can form calcium carbonate with CO2 - in the water column. In this process, a small amount of sol- uble phosphorus incmporated into calcium carbonate forming CaCO3 -P coprecipitation, leading to the transformation of soluble phosphorus to hard dissolved phosphorus. This kind of calcium pump driven by submerged macrophytes in water environment plays an important role in the phosphorus cycle. Research proves that CaCO3-P coprecipitation can be formed on the leave surface of sub- merged macrophyte Potamogeton crispus and the content of total phosphorus in the coprecipitation changes in a wide range. In addi- tion, the coprecipitation of calcium and phosphorus in the newly-formed sediments exists a process that polyphosphate can evolve to apatite gradually. It is not clear if this process occurred during the coprecipitation of calcium and phosphorus on the leave surface of submerged macrophytes is related to the phosphonis removal by submerged macrophytes. In this review, the research progress on the contributions of calcium transportation to the phosphorus cycle in the water system was introduced in detail, together with phos- phorus cycle, function of calcium, and calcium pump hypothesis driven by submerged macrophytes and its implications.