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为了研究耕作侵蚀对坡耕地土壤容重、有机质以及两者相互关系的影响,选择四川盆地中部的简阳县的坡耕地作为研究对象,采用模拟耕作的方法,通过对比模拟耕作前与5次、20次模拟耕作之后的土壤容重、有机质的水平以及垂直变化与分布规律,并探讨耕作侵蚀对两者关系变化的影响规律。研究结果表明:由于耕作侵蚀的搬运作用,5次和20次耕作之后坡顶位置的表层土壤被不断搬运至下坡位置,从而导致坡顶表层土壤容重增加;并且耕作过程中锄头的翻转作用改变了土壤容重在垂直方向的分布。耕作前土壤有机质在各坡面位置的垂直分布可用对数方程描述,然而5次和20次耕作之后其两者之间没有显示任何关系。耕作前土壤有机质含量与土壤容重呈现显著的负相关关系,5次和20次耕作之后,土壤有机质和土壤容重之间无相关关系。因此,耕作侵蚀改变土壤有机质和容重在水平和垂直方向的分布并且改变有机质和容重之间的关系。
In order to study the effect of tillage erosion on soil bulk density, organic matter and the relationship between soil organic matter and sloping land, the sloping farmland in Jianyang County in the middle of Sichuan Basin was selected as the research object. The simulated tillage method was used to simulate tillage before and 5 times, 20 times The soil bulk density, organic matter level and vertical variation and distribution were simulated after tillage, and the influence of tillage erosion on the relationship between the two was discussed. The results showed that topsoil at the top of the hill was continuously transported to the downhill position after 5 times and 20 tillage operations due to tillage and erosion, which resulted in the increase of bulk density of the top soil on the top of the slope and the overturning effect of the hoe during the tillage The distribution of soil bulk density in the vertical direction. The vertical distribution of soil organic matter at each slope position prior to tillage can be described by a logarithmic equation, whereas no relationship is shown between the two after 5 and 20 tillage. There was a significant negative correlation between soil organic matter content and soil bulk density before tillage. There was no correlation between soil organic matter and soil bulk density after 5 and 20 tillage. Therefore, tillage erosion changes the distribution of soil organic matter and bulk density in horizontal and vertical directions and changes the relationship between organic matter and bulk density.