| 引用本文: | 刘畅,齐伟,王策,等.无机肥施用对农田干湿循环土壤收缩特性影响[J].灌溉排水学报,0,():-. |
| Liuchang,QI Wei,WANG Ce,et al.无机肥施用对农田干湿循环土壤收缩特性影响[J].灌溉排水学报,0,():-. |
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| 摘要: |
| 【目的】为研究无机肥施用对农田干湿循环土壤收缩特性的影响。【方法】选取南方地区粉壤土为试验土样，尿素、硫酸钾两种肥料配置浸润液（浓度设置为1、2、3 g?L-1），开展多级循环脱湿试验。【结果】结果表明：1）土壤收缩应变随着循环级数的推进而减小，且逐渐趋于稳定。无机肥的添加减少了土壤收缩应变，且随着循环级数的推进表现愈加明显。2）VG-Peng模型拟合土壤收缩特性曲线效果较好，各处理组均具有结构收缩、比例收缩、残余收缩、零收缩四个阶段，干湿循环使土壤结构收缩段增加，比例收缩段和残余收缩段减小。无机肥的添加使土壤比例收缩段孔隙比范围减少。3）土壤收缩经历了从完全的纵向收缩??―以纵向收缩为主―以横向收缩为主三个阶段，多次循环后土壤收缩各向异性减弱。【结论】无机肥添加和干湿循环条件不同程度减弱了土壤的收缩特性，多次循环后无机肥累积是土壤收缩能力下降的主要原因。 |
| 关键词: 干湿循环；无机肥；土壤收缩应变；收缩特性曲线；几何因子 |
| DOI： |
| 分类号:S152.4，S143 |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| Effect of Inorganic Fertilizer Application on Soil Shrinkage Characteristics of Wetting-Drying Cycle in Farmland |
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Liuchang1, QI Wei2, WANG Ce1, ZHANG Zhanyu1
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1.河海大学农业科学与工程学院;2.河海大学水利水电学院
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| Abstract: |
| 【Objective】In order to study the effect of application of inorganic fertilizer on soil shrinkage characteristics. 【Method】a multi-stage cyclic dehydration experiment was carried out with southern silty loam soil，during which the soil was wetted by urea or potassium sulfate solution (1, 2, 3 g?L-1). 【Result】The results show that: 1) the soil transverse and longitudinal shrinkage decreased with the increasing number of drying-wetting cycles and gradually stabilized. The addition of inorganic fertilizer reduced the transverse and longitudinal shrinkage, and the performance became more obvious with the increasing cycles. 2) VG-Peng model had a good fitting effect on soil shrinkage characteristic curve, and each treatment group had four stages: structure shrinkage, proportion shrinkage, residual shrinkage and zero shrinkage. The drying-wetting cycle increased structural shrinkage stage, and decreased the stage of proportion shrinkage and residual shrinkage. The addition of inorganic fertilizer reduced the range of void ratio in the soil proportional shrinkage section. 3) The soil shrinkage experienced three stages: complete longitudinal shrinkage, mainly longitudinal shrinkage??, mainly transverse shrinkage. The anisotropy of soil shrinkage decreases after several drying-wetting cycles. 【Conclusion】The results showed that the application of inorganic fertilizer and wetting-drying cycling conditions weakened the soil shrinkage in varying degrees, and the accumulation of inorganic fertilizer after multiple cycles was the main reason for the decline of soil shrinkage. |
| Key words: wetting-drying cycle; inorganic fertilizer; soil shrinkage strain; shrinkage characteristic curve; geometric factor |
