不同灌水处理农田表层土壤密实度变化特征

Change Characteristics of Topsoil Compactness of Farmland Under Different Irrigation Treatments

通过3种不同灌水处理玉米膜下滴灌大田试验,对土壤密实度与含水率的9次监测数据进行统计分析和曲线拟合,揭示了玉米全生育期农田表层土壤密实度随时间的变化过程,分析了土壤密实度与含水率间的数量关系。结果表明:灌水过程对土壤密实度影响较大,灌水后表层土壤密实度明显增大;土壤密实度不随灌水定额增大而增大(或减小);表层土壤密实度与含水率之间存在一定的二次函数关系,且相关系数为0.89~0.93。因此,进一步深度分析研究土壤密实度随时间和含水率的变化特征,这将对农田合理精准灌溉和防治土壤板结具有重要意义。

Through field corn trials under drip irrigation with plastic film mulch of three different irrigation treatments, statistical analysis and curve fitting for the nine monitoring data of soil compactness and moisture content in arable layer, the soil compactness change process with time in the whole stages of corn is revealed and the quantitative relationship between the soil compactness and moisture content are analyzed. The results show that： irrigation process has a greater influence on the soil compaction, which increases obviously in topsoil after irrigation; soil compactness does not show a trend of increase or decrease along with the increase of irrigation quota; there is a quadratic function relation between soil compactness and moisture content and the correlation coefficient is between 0.89 - 0.93. Therefore, further in-depth analysis about the changes of soil compactness and moisture content over time will be great significance for the rational precision irrigation and the pre- vention and control of farmland soil hardening.