| 摘要: |
| 为了掌握红壤丘陵地区水肥一体化灌溉中养分的迁移分布规律，为脐橙滴灌设计及水肥运移模拟提供指导；通过田间试验，研究不同滴灌流量和滴头间距条件下 在土体内的迁移分布，并借助Hydrus-3D建立了多点源红壤田间水肥溶质运移模型。通过试验与模拟结果表明：滴头间距越大，流量越大滴灌灌溉后 的分布范围越广，且流量相同时间距越大养分的交汇区域变小，同间距下流量越小容易在灌溉中形成施肥空白区；综合分析得出最适宜于红壤脐橙滴灌设计为滴头间距为30cm、流量为1L/h。Hydrus-3D模拟结果表明，模拟值与实测值的平均误差在11%以内，模型可以用于红壤区域养分迁移分布的模拟。 |
| 关键词: 红壤丘陵地区；多点源滴灌； ；数值模拟 |
| DOI： |
| 分类号:S275.6?????? |
| 基金项目:国家自然科学(51379172)和江西省科技厅重点研发计划项目(20151BBF60012、20077BBF60060) |
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| Distribution characteristics and numerical simulation ofinfiltration and migration of multi-point source drip irrigation in red soil hilly area |
|
Pei Qing Bao
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|
Jiangxi water conservancy research institute nanchang
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| Abstract: |
| In order to grasp the nutrient migration and distribution law in integrated irrigation of water and fertilizer in red soil hilly area, and provide guidance for navel orange drip irrigation design and Simulation of water and fertilizer migration.Field experiments were conducted to study the 〖NO〗_3^--N transport and distribution in red soil under different drip irrigation discharge and drip spacing. A model of water and fertilizer solute transport in red soil with multi-point source was established by Hydrus-3D.The results of experiment and simulation show that: The larger the dripper spacing is the wider the distribution range of drip irrigation, and the smaller the intersection area of nutrients is the smaller the discharge, and the easier the fertilization blank area is to be formed in irrigation.Comprehensive analysis showed that the dripper spacing was 30 cm and the flow rate was 1L/h, which was most suitable for navel orange drip irrigation in red soil.Hydrus-3D simulation results show that the average error between the simulated and measured values is less than 11%. The model can be used to simulate nutrient transport and distribution in red soil region. |
| Key words: Red soil hilly area; Multi-point source drip irrigation; ; numerical simulation |
