【摘要】 文章为探求沼液对土壤饱和导水率的影响,采用变水头渗透试验的方法系统研究了不同容重条件下沼液理化性质对土壤饱和导水率的影响,并采用多元逐步回归分析方法筛选了沼液理化性质对土壤饱和导水率的主要影响因子。结果表明,沼液入渗过程中,土壤饱和导水率随土壤容重的增加而降低;沼液配比、沼液电导率、沼液黏度、沼液干物质的量和土壤饱和导水率均呈拟合优度很好的负相关指数函数关系,且方程均具有极显著的统计学意义;沼液pH值和土壤饱和导水率呈负相关的抛物线关系,采用一元二次函数方程能够很好反映土壤饱和导水率随沼液pH值增减的变化特征;多元逐步回归分析表明沼液理化性质均与土壤饱和导水率存在极显著的相关性,其中沼液干物质的量和沼液黏度是影响土壤饱和导水率的主要因子。由此可见,土壤饱和导水率会受到沼液理化性质的影响,在研究分析沼液入渗对土壤饱和导水率影响时,不仅要考虑土壤机械组成、土壤容重、土壤有机质含量等土壤因素带来的影响外,还要考虑沼液理化特性对土壤饱和导水率产生的影响。更多还原

【Abstract】 The purpose of this study is to explore the effect of biogas slurry on soil saturated hydraulic conductivity. The effects of physicochemical properties of biogas slurry on soil saturated hydraulic conductivity under different soil bulk density conditions were studied systematically by means of variable head penetration test. Multivariate stepwise regression analysis was used to screen the main influencing factors. The results showed that during the infiltration process of biogas slurry,the soil saturated hydraulic conductivity decreased with the increase of soil bulk density. The biogas slurry proportion,conductivity,viscosity,dry matter quantity and soil saturated hydraulic conductivity all showed a good negative correlation exponential function,and the equations were statistically significant. The parabolic relationship between p H value and soil saturated hydraulic conductivity was negatively correlated. The one-dimensional quadratic function equation could well reflect the variation of soil saturated hydraulic conductivity with the increase or decrease of p H value of biogas slurry. Multivariate stepwise regression analysis showed that there was a significant correlation between the physicochemical properties of biogas slurry and soil saturated hydraulic conductivity. The amount of dry matter in biogas slurry and the viscosity of biogas slurry were the main factors affecting the saturated hydraulic conductivity of soil. Thus it could be seen that soil saturated hydraulic conductivity would be affected by the physicochemical properties of biogas slurry. When studying and analyzing the influence of infiltration of biogas slurry on soil saturation hydraulic conductivity,not only consider the influence of soil mechanical composition,soil bulk density,soil organic matter content and other soil factors,but also the influence of physic-chemical properties of biogas slurry should be considered.更多还原