| 4种水生植物根际磷素耗竭效应的比较 |
| 摘要点击 3815 全文点击 3377 投稿时间：2007-09-26 修订日期：2007-11-24 |
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| 中文关键词 根际土壤 磷素耗竭 水溶性磷 根系形态 磷素吸收有效性 磷素利用有效性 |
| 英文关键词 rhizosphere soil phosphorus depletion water-soluble P root morphology phosphorus uptake efficiency phosphorus use |
| 作者 | 单位 | | 王震宇 | 中国海洋大学环境科学与工程学院海洋生态与环境教育部重点实验室, 青岛 266100 | | 温胜芳 | 中国海洋大学环境科学与工程学院海洋生态与环境教育部重点实验室, 青岛 266100 | | 邢宝山 | 中国海洋大学环境科学与工程学院海洋生态与环境教育部重点实验室, 青岛 266100
Department of Plant, Soil and Insect Sciences, University of Massachusetts, Amherst MA01003, USA | | 高冬梅 | 中国海洋大学环境科学与工程学院海洋生态与环境教育部重点实验室, 青岛 266100 | | 李锋民 | 中国海洋大学环境科学与工程学院海洋生态与环境教育部重点实验室, 青岛 266100 | | 胡洪营 | 清华大学环境科学与工程系, 北京 100084 | | Sakoda Akiyoshi | 东京大学生产技术研究所,日本 东京 153-8505 | | Sagehashi Masaki | 东京大学生产技术研究所,日本 东京 153-8505 |
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| 中文摘要 |
| 利用短期盆栽试验和抖根法研究了喜旱莲子草(Alternanthera philoxeroides)、香蒲(Typha latifolia)、慈姑(Sagittaria sagittifolia)和芦苇(Phragmites communis)4种水生植物的根际磷素耗竭效应, 分析了植物根冠比、根系形态、磷素吸收有效性和磷素利用有效性等差异, 探讨了植物根际磷素耗竭效应的吸收利用调控机制. 结果表明, 与非根际土壤(有效磷含量为167.53μg·g-1)相比, 喜旱莲子草、香蒲、慈姑和芦苇根际土壤的有效磷含量分别减少至80.17、 124.37、 155.38和161.75 μg·g-1, 水溶性磷含量分别减少了81%、 42%、 18%和16%. 喜旱莲子草根系较小, 但磷素吸收有效性高(1.32 mg·m-1), 其磷素利用有效性不高(0.34g·mg-1); 香蒲的磷素吸收有效性虽然比喜旱莲子草低许多(0.52 mg·m-1), 但其有强大的根系, 且磷素利用有效性高(0.64g·mg-1)、根冠比大(0.35). 喜旱莲子草和香蒲耗竭根际磷素的能力高于慈姑和芦苇. |
| 英文摘要 |
| Four aquatic plants (Alternanthera philoxeroides, Typha latifolia, Sagittaria sagittifolia, Phragmites communis) were cultured on P-enriched soil in a pot experiment to assess the phosphorus rhizosphere depletion effect and analysis the ratio of root to shoot, root morphology, phosphorus uptake efficiency and phosphorus use efficiency. An obvious variation in P concentration of the soil in the rhizophere and non- rhizophere was observed. Compared with the non-rhizosphere (available P: 167.53 μg·g-1), the available P in the rhizosphere soil of Alternanthera philoxeroides, Typha latifolia, Sagittaria sagittifolia and Phragmites communis was reduced to 80.17， 124.37， 155.38 and 161.75 μg·g-1 respectively, with 81%， 42%， 18% and 16% reduction ratio of water-soluble phosphorus. More effective phosphorus depletion was achieved in Alternanthera philoxeroides by higher phosphorus uptake efficiency (1.32 mg·m-1), while rooting system was small and phosphorus use efficiency was low(0.34 g·mg-1). Phosphorus uptake efficiency of Typha latifolia is much lower (0.52 mg·m-1) than that of Alternanthera philoxeroides, however, its strong rooting system enhanced soil exploration, with higher phosphorus use efficiency (0.64 g·mg-1) and the ratio of root to shoot (0.35). Alternanthera philoxeroides and Typha latifolia were more effective in phosphorus depletion of the rhizosphere soil than that in Sagittaria sagittifolia and Phragmites communis. |
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