气压深松土壤孔隙度测试与分析

发布时间：2018-03-08 17:19

本文选题：孔隙度　切入点：压力　出处：《农业工程学报》2017年01期 　论文类型：期刊论文

【摘要】：为了明晰气压深松土壤孔隙度的变化规律及其效果,利用温纳电阻率法测试气压深松前、后的土壤孔隙度,并以孔隙度增加率为指标进行分析,结果表明:深松气压和水平距离对孔隙度增加率有极显著影响(P0.01),而犁底层容重没有显著影响;水平距离0.7 m内的土壤孔隙度增大,犁底层孔隙度增加率随水平距离增加呈现先缓慢变化在0.4 m处出现峰值后,急速减小的变化趋势,水平距离0.1~0.4 m的孔隙度增加率均值显著大于0.5~0.6 m的孔隙度增加率均值(P0.05);深松气压2.2和1.8 MPa作用下的犁底层孔隙度增加率差异不显著,但均显著大于1.4 MPa作用下的犁底层孔隙度增加率(P0.05),1.8 MPa为最佳深松气压。结论可为气压深松技术及其设备的研发提供依据。
[Abstract]:In order to understand the variation law of soil porosity and its effect, the porosity of soil before and after deep air pressure relaxation was measured by Winner resistivity method, and the porosity increase rate was used as an index to analyze it. The results showed that the porosity increase rate was significantly affected by deep pressure and horizontal distance, but not by the bulk density of plow bottom layer, and the soil porosity increased within 0.7 m from horizontal distance. With the increase of horizontal distance, the increase rate of porosity in the bottom layer of plough showed a trend of slow change at first and then a peak value at 0.4 m, and then a rapid decrease. The average porosity increase rate of 0. 1 ~ 0. 4 m from horizontal distance is significantly larger than that of 0. 5 ~ 0. 6 m porosity increase rate (P0. 05), but there is no significant difference in the porosity increase rate of plough bottom layer under the action of 2. 2 and 1. 8 MPa deep loosening pressure. But the increase rate of porosity of plow bottom under the action of 1. 4 MPa was significantly higher than that of 1. 4 MPa. P0. 05 ~ 1. 8 MPa was the best pressure for deep loosening. Conclusion it can provide the basis for the research and development of air pressure deep loosening technology and its equipment.
【作者单位】：东北农业大学工程学院;黑龙江科技大学机械工程学院;
【基金】：国家科技支撑计划课题(2014BAD06B04)
【分类号】：S152.9

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