| 摘要: |
| 【目的】探讨影响土壤大孔隙形成的主要因素。【方法】利用土壤水分穿透曲线法对北京市昌平区农地的土壤大孔隙数量特征进行分析，确定了大孔隙数量的潜在影响因素，包括根系密度、土壤质地、土壤结构（水稳性团聚体）、有机质含量，并利用典型相关分析，研究了各因素对大孔隙率的影响。【结果】根系密度、土壤质地和水稳性团聚体对大孔隙的形成均存在显著影响；根系密度与大孔隙率呈极显著正相关关系（P＜0.01），根系密度对大孔隙的影响主要在于根对土壤的机械力作用以及环形根孔本身作为大孔隙的一部分对大孔隙率的直接贡献；土壤质地对大孔隙形成的影响主要在于粉粒含量的变化，粉粒含量与大孔隙率呈显著负相关关系（P＜0.05），砂粒和黏粒含量对大孔隙率的影响不显著；土壤水稳性团聚体含量与大孔隙率呈显著正相关关系（P＜0.05），但二者之间的关系又主要受有机质含量的影响。【结论】土壤大孔隙形成的主要影响因素为植物根系密度、粉粒含量和有机质含量。 |
| 关键词: 农地 土壤大孔隙 影响因素 优先流 |
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| 基金项目:国家自然科学基金项目（41271300，30900866）；国家“十二五”科技支撑计划项目（2011BAD38B0403） |
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| Factors influencing the macropores properties of agricultural land in Changping District,Beijing |
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WANG Binyan, CHENG Jinhua, ZHANG Hongjiang,et al
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Beijing Forestry University
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| Abstract: |
| 【Objective】This study explored the factors that affect the formation of macropores.【Method】Using water breakthrough curves,the amount of macropores of agricultural land in Changping District were calculated.Potential effecting factors,including root density,soil texture,aggregates content and organic content were selected.Canonical correlation analysis was used to study the relationship between these factors and macropore proportions.【Result】Root density had a very significant positive correlation with macropores content（P＜0.01）,root density mainly affected macropores by having mechanical forces to soil and directly providing ring-shaped channel around roots.In terms of soil texture,silt particle content had a significant negative correlation with macropores content（P＜0.05）,while sand and clay particle contents played less important roles.Aggregates content had a significant positive correlation with macropores content（P＜0.05）,and the connection between them mostly depended on the content of organic matter.【Conclusion】The formation of macropores was significantly impacted by root density,silt particles content and aggregates content. |
| Key words: agricultural land soil macropores influential factors preferential flow |
