摘要
为揭示滇池水生植物分布对沉积物间隙水磷的质量浓度的影响,分别采集滇池有植物区域和无植物区域沉积物柱状样,测定间隙水和上覆水溶解性总磷（DTP）、溶解性活性磷（SRP）和溶解性有机磷（DOP）的质量浓度,分析其沉积物间隙水磷的垂向变化特征,探讨水生植物对沉积物间隙水磷形态特征的影响及控制效果,结果表明：1水生植物对滇池不同湖区沉积物间隙水各形态磷的质量浓度影响显著,但因分布站点不同、深度层次变化所呈现的规律也各不相同;2水生植物显著降低了沉积物间隙水DOP的贡献率,有植物区域DOP平均贡献为32.87%,无植物区域则平均贡献为57.68%;3水生植物抑制了沉积物无机磷的释放,促进了DOP的转化.有植物区域SRP沉积物-水界面扩散通量比无植物区域平均降低39.99%;4水生植物生长对沉积物间隙水各形态磷的浓度削减比较明显,尤其是DOP,削减率达到了38.02%-85.49%.因此分析水生植物对沉积物间隙水DOP贡献率及削减率,对深入理解水生植物与间隙水DOP之间的关系及沉积物有机磷的矿化降解具有重要意义.
In order to reveal the effect of aquatic plants distribution on the mass concentration of phosphorus in sediment interstitial water,the mass concentrations of Dissolved Total Phosphorus（ DTP）,Soluble Reactive Phosphorus（ SRP） and Dissolved Organic Phosphorus（ DOP） in the sediment interstitial water and overlying water from areas with or without plants in the same site of Dianchi were studied. The vertical variation characteristics of phosphorus forms in sediment interstitial water were analyzed to explore the effect of aquatic plants on the phosphorus forms in sediment interstitial water. The results showed： 1Aquatic plants had an significant effect on the phosphorus mass concentration of the sediment interstitial water in different Dianchi lakes. However,they varied with different distribution sites and depth. 2 Aquatic plants significantly decreased the percentage of DOP contribution in the sediment interstitial water. The average contribution of DOP with aquatic plants was 32. 87%,while that without plants reached 57. 68%; 3Aquatic plants significantly inhibited the release of inorganic phosphorus in sediments and promoted the transformation of DOP. The SRP diffusion flux at sediment-water interface with aquatic plants was increased by 39. 99% as compared with that without plants; 4The growth of aquatic plants significantly reduced the concentration of phosphorus in sediment interstitial water,especially DOP,and the reduction rate of the sediment interstitial water DOP was from 38. 02% to 85. 49%. Therefore,the analysis of the contribution and reduction rate of aquatic plants on the sediment interstitial water DOP was of great importance in understanding the relationship between aquatic plants and DOP,as well as the mineralization of organic phosphorus in sediments.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2016年第10期3828-3834,共7页
Environmental Science
基金
国家水体污染控制与治理科技重大专项(2012ZX07102-004)
国家自然科学基金项目(U1202235)
关键词
水生植物
沉积物
间隙水
磷
控制效果
aquatic plants
sediment
interstitial water
phosphorus
control effect
