| 稻田层间流活性磷素的动态变化 |
| 摘要点击 2831 全文点击 2420 投稿时间：2001-11-21 修订日期：2002-04-01 |
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| 中文关键词 磷素 稻田层间流 流失浓度 流失潜能 动态变化 |
| 英文关键词 phosphorus subsurface runoff of rice field loss concentration loss potential dynamic characteristic |
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| 中文摘要 |
| 采用特氟纶管采样法,原位、动态、实时地研究了水田15～20cm层间流活性磷(钼酸盐反应磷,MRP)的流失浓度及潜能.研究表明,早稻生长期间水田层间流MRP浓度为0.110～0.273 mg/L,晚稻生长期的MRP浓度为0.085～0.285 mg/L;水田15～20cm层间流磷素浓度差异与施用磷肥造成的土壤含磷水平大小直接相关,且随着土壤磷素的提高其流失潜能随之增加;配施有机肥不影响水田层间流磷素的流失潜能. |
| 英文摘要 |
| A special rice field experiment was conducted to investigate the characteristic and mechanism of phosphorus (P) loss potential in subsurface runoff from rice field. Teflon Suction Cups (TSC) were inserted into tested plots in 15～20 cm in the rice field for water sampling dynamically. The range of molybdate reactive phosphorus (MRP) in subsurface runoff were 0.110～0.273 mg/L, 0.085～0.285 mg/L during growth seasons of early rice and later rice, respectively. The magnitude of MRP concentrations in subsurface runoff in 15～20 cm from rice field was more consistent with trend of soil P accumulation (expressed as Olsen P) due to P application. P concentration and its expected loss loading in the subsurface runoff in 15～20 cm in the rice field were not affected by P application combined with manure. |
