紫色土坡耕地土质埂坎分层入渗试验研究
发布时间：2018-09-19 16:29
【摘要】：以相邻田面为对照,利用双环入渗法对三峡库区紫色土坡耕地土质埂坎分层(地埂、坎腰和坎趾)的入渗特征进行研究。结果表明:(1)土质埂坎分层入渗与对照田面入渗均呈先陡降后趋于稳定的趋势,但达到稳定入渗的时间存在差异。地埂达到稳定入渗的时间最长(110min),坎腰、坎趾和田面达稳定入渗的时间分别比地埂少9%,82%,18%。从入渗性能看,土质埂坎各层均表现出初始入渗率平均入渗率稳定入渗率。平均入渗率与120min累积入渗量表现为地埂坎腰田面坎趾,初始入渗率为坎腰地埂田面坎趾,稳定入渗率为田面坎腰地埂坎趾。(2)采用4种模型进行拟合,其中通用经验模型是描述坡耕地土质埂坎入渗的较好模型,其后依次是Kostiakov模型、Horton模型和Philip模型。(3)土质埂坎入渗性能与土壤物理性质具有较好的相关性,初始入渗率与初始含水率、容重呈显著负相关(P0.05),平均入渗率、120min累积入渗量与粉粒体积分数、初始含水率呈显著负相关(P0.05),与砂粒体积分数和总孔隙度呈显著正相关(P0.05)。研究结果可为紫色土区坡耕地土壤侵蚀调控的埂坎措施优化提供依据。
[Abstract]:The infiltration characteristics of ridge (ridge, ridge waist and ridge toe) of purple soil sloping farmland in the three Gorges Reservoir area were studied by using double ring infiltration method. The results showed that: (1) the stratified infiltration of soil ridge and the control field showed a tendency of steeply decreasing and then becoming stable, but the time to reach stable infiltration was different. The longest time of stable infiltration (110min) was achieved in the ridge, and the time of stable infiltration in the ridge, the toe and the surface of the field was 9 / 82 / 18 less than that in the ridge, respectively. From the point of view of infiltration performance, the average initial infiltration rate is stable in each layer of soil ridge. The average infiltration rate and the 120min cumulative infiltration rate are as follows: the ridge surface toe, the initial infiltration rate the ridge toe, and the stable infiltration rate the ridge toe. (2) four kinds of models are used to fit the infiltration rate, and the results are as follows: (1) the average infiltration rate and the 120min cumulative infiltration rate are the same as the ridge toe, the initial infiltration rate is the ridge toe and the stable infiltration rate is the ridge toe. The general empirical model is a better model to describe the infiltration of sloping farmland soil ridge, followed by Kostiakov model and Philip model. (3) the infiltration performance of soil ridge has a good correlation with the soil physical properties. The initial infiltration rate was significantly negatively correlated with the initial moisture content and bulk density (P0.05), the average infiltration rate of 120min was negatively correlated with the silt volume fraction, the initial water content was significantly negatively correlated with the initial moisture content (P0.05), and there was a significant positive correlation between the initial infiltration rate and the sand volume fraction and the total porosity (P0.05). The results can provide the basis for the optimization of soil erosion control measures of sloping farmland in purple soil area.
【作者单位】： 重庆师范大学地理与旅游学院;三峡库区地表过程与环境遥感重庆市重点实验室;
【基金】：国家自然科学基金项目(41471234) 重庆市基础与前沿研究计划项目(cstc2015jcyjBX0141) 重庆市教委科技项目(KJ1500315)
【分类号】：S157
[Abstract]:The infiltration characteristics of ridge (ridge, ridge waist and ridge toe) of purple soil sloping farmland in the three Gorges Reservoir area were studied by using double ring infiltration method. The results showed that: (1) the stratified infiltration of soil ridge and the control field showed a tendency of steeply decreasing and then becoming stable, but the time to reach stable infiltration was different. The longest time of stable infiltration (110min) was achieved in the ridge, and the time of stable infiltration in the ridge, the toe and the surface of the field was 9 / 82 / 18 less than that in the ridge, respectively. From the point of view of infiltration performance, the average initial infiltration rate is stable in each layer of soil ridge. The average infiltration rate and the 120min cumulative infiltration rate are as follows: the ridge surface toe, the initial infiltration rate the ridge toe, and the stable infiltration rate the ridge toe. (2) four kinds of models are used to fit the infiltration rate, and the results are as follows: (1) the average infiltration rate and the 120min cumulative infiltration rate are the same as the ridge toe, the initial infiltration rate is the ridge toe and the stable infiltration rate is the ridge toe. The general empirical model is a better model to describe the infiltration of sloping farmland soil ridge, followed by Kostiakov model and Philip model. (3) the infiltration performance of soil ridge has a good correlation with the soil physical properties. The initial infiltration rate was significantly negatively correlated with the initial moisture content and bulk density (P0.05), the average infiltration rate of 120min was negatively correlated with the silt volume fraction, the initial water content was significantly negatively correlated with the initial moisture content (P0.05), and there was a significant positive correlation between the initial infiltration rate and the sand volume fraction and the total porosity (P0.05). The results can provide the basis for the optimization of soil erosion control measures of sloping farmland in purple soil area.
【作者单位】： 重庆师范大学地理与旅游学院;三峡库区地表过程与环境遥感重庆市重点实验室;
【基金】：国家自然科学基金项目(41471234) 重庆市基础与前沿研究计划项目(cstc2015jcyjBX0141) 重庆市教委科技项目(KJ1500315)
【分类号】：S157
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