| 苦草（Vallisneria natans）根系对沉积物中各形态磷的影响 |
| 摘要点击 3224 全文点击 1778 投稿时间：2013-05-07 修订日期：2013-10-29 |
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| 中文关键词 苦草 根系 沉积物 磷形态 垂直分布 |
| 英文关键词 Vallisneria natans root sediment phosphorus fraction vertical distribution |
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| 中文摘要 |
| 采用磷分级提取的方法研究苦草（Vallisneria natans）生长过程中根系分布与沉积物不同形态磷和总磷的变化过程.在实验开始后20、50、80 d，分别测定苦草根系在沉积物的分布及沉积物中各形态磷的垂直变化.结果表明，苦草根系在实验装置中垂直分布在0~14 cm区域内.平均每株苦草根系根数为58条，平均根长为5.86 cm.苦草根系生物量在沉积物深度0~3、4~6、7~10、11~14 cm分配的质量分数分别为45.99%、32.75%、16.03%、5.23%.沉积物中总磷（TP），NaOH提取磷（NaOH-P）和有机磷（OP）含量在苦草根系分布集中区域内显著降低（P<0.05）.HCl提取磷（HCl-P）和无机磷（IP）的含量无显著差异（P>0.05）. |
| 英文摘要 |
| The present study explored phosphorus fractions in sediments with the growth of Vallisneria natans. Sediment samples in different layers were collected at 20, 50 and 80 d, and vertical change of several phosphorus fractions were measured in the samples. The root distributions and biomass of the V. natans were measured. Our results showed that roots were distributed between 0 and 14 cm in the experimental device. The average number of roots and average root length were 58 and 5.86 cm. After 80 days growth, the percentage of V. natans root biomass were 45.99%, 32.75%, 16.03% and 5.23% in the sediment with depths of 0-3, 4-6, 7-10 and 11-14 cm. Total phosphorus (TP) content, phosphorus extracted by NaOH (NaOH-P), and organic phosphorus (OP) levels remarkably decreased (P<0.05) in the area with a high concentration of tape grass roots. The content of phosphorus extracted by HCl (HCl-P), and inorganic phosphorus (IP), showed no significant difference (P>0.05). The results suggest that V. natans root affects the migration and transformation of phosphorus species in the sediment. |
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