沉水植物对不同层次沉积物及土壤中磷迁移的影响

利用相同区域湖泊沉积物及土壤培养黑藻,分析不同层次底质中各形态磷含量和间隙水中磷浓度的变化,揭示在沉水植物作用下淹水土壤和沉积物中不同层次磷的迁移规律。结果表明,本试验条件下,土壤各层次均比营养水平相当的沉积物中磷的迁移性大,黑藻能促进上层底质中无机磷向上覆水中迁移,通过根系作用促进根尖分布层底质中有机磷的迁移转化;黑藻对沉积物下层(根尖分布层)磷迁移转化的影响小于土壤,对上层底质中磷向上覆水中迁移的影响大于土壤;黑藻通过吸收作用及改变根区环境条件,影响底质间隙水中各形态磷的浓度,黑藻对沉积物间隙水中磷浓度的影响大于土壤。

Effect on Transferred of Phosphorus in Different Layer Sediment and Soil by Submerged Plant

The changes of the phosphorus forms in the sediments and gap water of the different layer sediments by submerged plant has been studied using the submerged plant Hydrilla verticillata culturing in homology area sediments and soil.The rule on the transferred of the phosphorus forms in different layer sediments and submerged soil by submerged plant has been studied using were open out.The different layer soil results show prone to transferred of phosphorus;The results indicate that the main transferred of phosphorus on the soil great than the comparative level on the alimentation sediments,the submerged plant Hydrilla verticillata can to boost transferred inorganic phosphorus in the superstratum sediments to overlying water and boost transferred organic phosphorus in the substrate(layer take on root tip) sediments;Effects of transferred of the phosphorus in the substrate sediments less than soil, the superstratum sediments great than soil by submerged plant.Effects of changes of the phosphorus forms in the gap water of the sediments by absorb effect and circumstance effect of the Hydrilla verticillata,effects of changes of the phosphorus forms in the gap water and the sediments great than soil by Hydrilla verticillata.