基于计算实验的砒砂岩与沙复配土团聚结构与质地变化的仿真研究

Based on computational experiment simulation of feldspathic sandstone and sand mixed soil aggregate structure and texture changes

团聚体的形成主要靠粘粒的内聚力及铁铝氧化物的胶结作用,本文考虑单一因素粘粒对团聚体形成的影响,并定量化表达和探讨对有机质含量较小的砒砂岩和沙复配土中粘粒和水稳性团聚体的相关性,并通过计算机模拟仿真进行相关性验证,达到以土壤质地中粘粒的含量预测土壤团聚体的目的。本文将砒砂岩与风沙土分别按1∶1,1∶2,1∶5和0∶1质量比复配并在2010年建立小区,经过20102013年连续4年的试验连续取样观测,用激光粒度分析仪和湿筛法分别对其粒度组成及水稳性团聚体分析研究。根据混合后未种植以及20102013年5次实验数据表明(相关系数分别是0.742、0.794、0.887、0.714、0.755),不同年份的粘粒含量和团聚体具有正相关性,且相关性随年份变化相对稳定,时间变异不大。根据multi-agent(MAS)方法建立人工土壤团粒模型(Artificial Soil Aggregates Model,简称ASAM),以粘粒含量对团聚体含量的进行预测,预测结果与实测值基本吻合。研究结论:(1)针对有机质含量较少的砒沙岩与沙复配土,粘粒含量和团聚体含量具有较好的正相关性,且相关性随年份变化相对稳定;(2)仿真结果表明,利用ASAM模型仿真,计算仿真结果与实测数据趋势基本一致,首次将计算实验方法应用于复配土壤微结构变化过程研究,对不同复配土壤微结构变化定量描述提供了新的方法,并对土壤复杂性仿真提供了一条可行性途径,具有一定推广和应用前景。

The formation of aggregate mainly depends on the cohesion of clay and iron and aluminum oxide cementation,this paper consider a single factor impact on aggregate formation of clay,and quantitatively express and discuss the organic matter content less feldspathic sandstone and sands with clay in the soil and water stability of aggregate,and verifies the correlation through the computer simulation,reaches to the clay content in the soil texture of soil aggregate.In this paper,the feldspathic sandstone and sand soil,respectively,according to the 1∶1,1,2,1∶5and 0∶1quality than distribution and in the village built in 2010,after four years in a row in 20102013 of continuous sampling observation,experiment with laser particle size analyzer andwet sieve method respectively to its particle size composition and the water stability of aggregate.According to the blend to not grow and experimental data,it shows that after 5times from 2010 to 2013(correlation coefficient were 0.742,0.794,0.887,0.794,0.887),the clay content of different years had a positive correlation with aggregate,and the correlation is relatively stable in the years.Based on the multi-agent(MAS)method to establish Model of Artificial Soil aggregate(Artificial Soil Aggregates Model,referred to as ASAM),with clay content forecasting aggregate content,the predicted results agreed with the measured values.Conclusion:(1)in view of the sandstone and sand mixed soil with less organic matter content,clay content and aggregate content has good correlation,and the correlation is relatively stable in the years;(2)the simulation results showed that using ASAM model simulation,the trend of computational simulation results and measured data was the same,and the method of computational experiment is first applied to the distribution of soil microstructure change process study,and provides a new method for quantitative description to the different distribution of soil microstructure change,and provides a feasible way for simulation of complexity soil,which has certain promotion and the application prospect.