Ding Shuai, Wang Sheng-Rui, Zhang Rui, Xiao Yan-Bo, Jiao Li-Xin, Li Le, Wang Zhong-Cheng, Yin Shi-Shi
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
Research Center of Lake Eco-Environment, State Environmental Protection Key Laboratory for Lake Pollution Control, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
Huan Jing Ke Xue. 2016 Oct 8;37(10):3828-3834. doi: 10.13227/j.hjkx.2016.10.021.
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. ②Aquatic 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.
为揭示水生植物分布对沉积物间隙水中磷质量浓度的影响，对滇池同一地点有植物和无植物区域的沉积物间隙水及上覆水中的溶解总磷（DTP）、可溶性活性磷（SRP）和溶解有机磷（DOP）的质量浓度进行了研究。分析了沉积物间隙水中磷形态的垂直变化特征，以探讨水生植物对沉积物间隙水中磷形态的影响。结果表明：①水生植物对滇池不同湖泊沉积物间隙水中的磷质量浓度有显著影响。然而，它们随不同的分布地点和深度而变化。②水生植物显著降低了沉积物间隙水中DOP的贡献百分比。有水生植物时DOP的平均贡献为32.87%，而无植物时达到57.68%；③水生植物显著抑制了沉积物中无机磷的释放并促进了DOP的转化。与无植物时相比，有水生植物时沉积物 - 水界面处的SRP扩散通量增加了39.99%；④水生植物的生长显著降低了沉积物间隙水中的磷浓度，尤其是DOP，沉积物间隙水DOP的降低率为38.02%至85.49%｡因此，分析水生植物对沉积物间隙水DOP的贡献和降低率对于理解水生植物与DOP之间的关系以及沉积物中有机磷的矿化具有重要意义｡
