两种沉水植物对间隙水磷浓度的影响  被引量:15

Influence of two submerged macrophytes on pore water phosphorus concentration

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作  者:王立志[1] 

机构地区:[1]山东省水土保持与环境保育重点实验室,临沂大学,临沂276000

出  处:《生态学报》2015年第4期1051-1058,共8页Acta Ecologica Sinica

基  金:国家自然科学基金项目(41303061);山东省科技攻关项目(2011GGH21704;2013GSF11701);临沂市重大科技创新项目(201211027);山东省水土保持与环境保育重点实验室开发基金(stkf201206)

摘  要:为研究两种根系特征的沉水植物在生长过程中对间隙水中磷浓度的影响,选取根系较多的沉水植物苦草和根系相对较少的沉水植物黑藻作为实验材料,监测底泥中间隙水各形态磷含量及环境因子的变化,探讨不同根系特征沉水植物对间隙水中磷的影响。结果表明:黑藻和苦草实验组沉积物间隙水中各形态磷的浓度均呈不同程度的降低,黑藻和苦草对于稳定水质,减少底泥中磷向水中转移具有明显的效果;沉水植物不同,底泥间隙水中溶解性总磷(DTP)和溶解性活性磷(SRP)存在明显差异。实验结束时黑藻组和苦草组间隙水中DTP的浓度分别为0.24,0.01 mg/L,SRP的浓度分别为0.22 mg/L,0.004 mg/L。间隙水中磷的形态主要以DTP和SRP为主,溶解性有机磷(DOP)的含量相对较低。沉水植物对间隙水中磷的吸收是降低间隙水中磷含量的重要原因,苦草的吸收能力大于黑藻。沉水植物根系通过降低底泥p H值,提高氧化还原电位(Eh)的方式抑制了底泥中磷的释放。Submerged macrophytes play an important role in nutrient cycling, especially in shallow lakes. Submerged maerophytes can acquire significant amounts of nutrients from the water via shoots and from the sediment via roots. In most natural situations, root uptake is the primary pathway for nutrients, because the absorbable nutrient concentrations are much higher in the sediment than in the water column. However, submerged submerged macrophytes, such as Vallisneria natans, have large root macrophyte species vary in their root traits. Some systems, while other species, such as Hydrilla verticillata, grow only a few roots per plant. Phosphorus (P) is the most critical nutrient limiting lake productivity, and while submerged macrophytes play an important role in P cycling, little is known about the effects of different submerged macrophyte species on the behavior of P. Therefore, studies of the effects of different root characters of submerged maerophytes on P concentrations are important for understanding lake ecosystems. The purpose of this work was to identify how two different typical submerged macrophytes, H. verticillata and V. natans, affect the behavior of sediment P. We examined P concentrations and environmental factors in aquatic systems growing each of these plant species from May to September, 2012. During that time, we collected samples of sediment pore water, sediment, and column water on days 0, 30, 60, 90, and 120 of the experiment to determine P concentrations. The environmental factors of pH and redox potential (Eh) of the sediment were also measured. The results indicated that P concentrations in pore water of the H. verticillata and V. natans treatments were lower than that of the control group. Both H. verticillata and V. natans had obvious effects on water stabilization and reducing P release from sediment. Pore water concentrations of dissolved total P (DTP) and soluble reactive P (SRP) in the H. verticillata and V. natans groups were significantly different, with 0. 24 mg/L DTP a

关 键 词:沉水植物 根系  间隙水 

分 类 号:Q948.8[生物学—植物学]

 

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