苦草(Vallisneria natans)衰亡对水-沉积物之间磷迁移的影响  

Effects of decline phase of Vallisneria natans on phosphorus transportation between water and sediment

作　　者：俞振飞[1] 徐东坡[1] 王国祥[2] 周彦峰[1] 吴晓东[3] 张敏莹[1] 

机构地区：[1]中国水产科学研究院淡水渔业研究中心,农业部长江下游渔业资源环境科学观测实验站,无锡214081 [2]南京师范大学地理科学学院,江苏省环境演变与生态建设重点实验室,南京210023 [3]中国科学院南京地理与湖泊研究所,南京210008

出　　处：《湖泊科学》2016年第1期94-104,共11页Journal of Lake Sciences

基　　金：公益性行业(农业)科研专项(201303056-2)资助

摘　　要：采用沉水植物苦草(Vallisneria natans)为研究对象,在其衰亡期测定群落内、外上覆水及沉积物各形态磷的含量,以探究沉水植物在其衰亡期对上覆水和沉积物中各形态磷的影响.结果表明:苦草衰亡过程中上覆水中总磷、可溶性总磷、溶解性活性磷、颗粒磷、可溶性有机磷浓度的变化相对平稳,与对照组相比无显著差异;沉积物中各形态磷含量均呈小幅度上升趋势,在实验结束时,苦草组沉积物中总磷含量为719.27 mg/kg,和初始值比增加了14.68 mg/kg,无机磷和有机磷含量分别增加了12.06和2.20 mg/kg,氢氧化钠提取磷和盐酸提取磷含量分别增加了7.05和4.29 mg/kg.总体来看,沉水植物苦草在其衰亡过程中分解速率较慢,对水-沉积物之间各形态磷含量无显著影响.In order to study the effects of submerged macrophytes on different forms of phosphorus during decline phase,we adopted Vallisneria natans as the study object and measured the content of phosphorus in water and sediment. Results showed that,in water,total phosphorus（ TP）,dissolved total phosphorus,soluble reactive phosphorus,particles phosphorus,and dissolved organic phosphorus in V. natans changed steadily,without any significant difference compared with control groups,while all forms of phosphorus in sediment had a little rising trend. At the end of the experiment,the content of TP was 719. 27 mg / kg in the V. natans sediment,and was 14. 68 mg / kg higher than the initial value. The inorganic phosphorus,organic phosphorus,NaOH-P,and HCl-P contents raised for 12. 06,2. 20,7. 05 and 4. 29 mg / kg,respectively. The results indicated that decomposition rate of V.natans was slow and there was no significant effect of V. natans decomposition on the different forms of phosphorus between water and sediment.

关 键 词：苦草 衰亡期 上覆水 沉积物 磷形态 

分 类 号：X524[环境科学与工程—环境工程] X173