滴灌条件下原状土与扰动土水分运动特性
发布时间：2018-10-21 08:43
【摘要】：为了分析土壤结构对土壤入渗规律的影响,通过研究云南红壤土滴灌条件下水分运动特征,采用室内外对比试验,试验共设计了3个滴头流量,分别为2.68,3.74,4.68L/h,土壤容重为1.2g/cm~3,分别进行了单、双点源滴灌入渗试验,着重分析了原状土与扰动土在一定的滴头流量下的湿润锋、湿润体变化特征,揭示区域土壤水分运移规律,进而为区域性作物灌水提供参考依据。结果表明:(1)原状土湿润锋运移速率比较快,原状土地表湿润比随交汇时间增加的速率快于扰动土,说明湿润锋的运移速率与土壤孔隙有关;(2)相同观测时间下,原状土湿润体变化比较快,原状土湿润体扁率α大于扰动土,原状土α=16.53%,扰动土α=45%;(3)原状土与扰动土含水率等值线变化有相同趋势,但不重合,疏密程度有差异;(4)原状土分形维数比扰动土的小,说明原状土孔隙分布差异大,扰动土的质地较均匀。研究结果揭示了该地区原状土与扰动土水分运动特征,为进一步的机理研究提供参考。
[Abstract]:In order to analyze the effect of soil structure on soil infiltration, the characteristics of water movement in Yunnan red loam under drip irrigation were studied. The soil bulk density is 1.2 g / cm ~ (-3) and 2.68 ~ 3.74 ~ 4.68 L / h, respectively. The infiltration tests of single and double point source drip irrigation were carried out respectively. The characteristics of wetting front and wetting body of undisturbed soil and disturbed soil under certain drip discharge were analyzed, and the regional soil moisture migration law was revealed. Then it provides reference for regional crop irrigation. The results are as follows: (1) the velocity of wet front migration in undisturbed soil is faster than that in disturbed soil, which indicates that the migration rate of wet front is related to soil porosity; (2) under the same observation time, the surface wettability of undisturbed soil is faster than that of disturbed soil. The change of wet body of undisturbed soil is faster, the flat ratio of wet body of undisturbed soil is larger than that of disturbed soil, the undisturbed soil 伪 = 16.53, the disturbed soil 伪 = 45. (3) the contour variation of moisture content of undisturbed soil and disturbed soil has the same trend, but does not coincide with that of disturbed soil. (4) the fractal dimension of undisturbed soil is smaller than that of disturbed soil, which indicates that the pore distribution of undisturbed soil is different and the texture of disturbed soil is more uniform. The results reveal the characteristics of water movement of undisturbed soil and disturbed soil in this area, and provide a reference for further study of mechanism.
【作者单位】： 昆明理工大学现代农业工程学院;
【基金】：国家自然科学基金项目(51409136) 昆明理工大学自然科学研究基金项目(KKSY201423023)
【分类号】：S152.7;S275.6
本文编号：2284579
[Abstract]:In order to analyze the effect of soil structure on soil infiltration, the characteristics of water movement in Yunnan red loam under drip irrigation were studied. The soil bulk density is 1.2 g / cm ~ (-3) and 2.68 ~ 3.74 ~ 4.68 L / h, respectively. The infiltration tests of single and double point source drip irrigation were carried out respectively. The characteristics of wetting front and wetting body of undisturbed soil and disturbed soil under certain drip discharge were analyzed, and the regional soil moisture migration law was revealed. Then it provides reference for regional crop irrigation. The results are as follows: (1) the velocity of wet front migration in undisturbed soil is faster than that in disturbed soil, which indicates that the migration rate of wet front is related to soil porosity; (2) under the same observation time, the surface wettability of undisturbed soil is faster than that of disturbed soil. The change of wet body of undisturbed soil is faster, the flat ratio of wet body of undisturbed soil is larger than that of disturbed soil, the undisturbed soil 伪 = 16.53, the disturbed soil 伪 = 45. (3) the contour variation of moisture content of undisturbed soil and disturbed soil has the same trend, but does not coincide with that of disturbed soil. (4) the fractal dimension of undisturbed soil is smaller than that of disturbed soil, which indicates that the pore distribution of undisturbed soil is different and the texture of disturbed soil is more uniform. The results reveal the characteristics of water movement of undisturbed soil and disturbed soil in this area, and provide a reference for further study of mechanism.
【作者单位】： 昆明理工大学现代农业工程学院;
【基金】：国家自然科学基金项目(51409136) 昆明理工大学自然科学研究基金项目(KKSY201423023)
【分类号】：S152.7;S275.6
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