【摘要】 为了给生物炭在滨海盐渍土的应用提供一定科学依据,采用室内一维垂直积水入渗试验,探讨了不同土壤初始含水率(1.5%、5%、10%、15%)对纯土及添加10%生物炭处理水分入渗特性的影响。结果表明,随着初始含水率增加,纯土及添加生物炭处理的水分入渗速率均加快。与纯土相比,添加10%生物炭降低了土壤水分入渗速率。但随着初始含水率增加,添加生物炭与纯土处理水分入渗历时差距逐渐减少,这说明添加生物炭在土壤初始含水率较高(降雨或灌溉后)时对滨海盐渍土水分入渗改善作用较为明显。Philip和Kostiakov模型拟合系数均大于0.99,能较好地描述生物炭添加到盐渍土中的水分入渗特性。更多还原

【Abstract】 The effect of soil initial water content and biochar on saline soil water infiltration was investigated by a one-dimensional vertical infiltration experiment under laboratory conditions.We measured water infiltration parameters in the coastal saline soil and saline soil amended with 10% biochar at different initial soil water content(1.5%,5%,10%,15%).The results showed that as the initial soil water content increased,the water infiltration of control and 10% biochar amendment increased.Compared with the control,biochar addition decreased the infiltration capacity of soil water,which was mainly because we used fixed bulk density to fill the soil column.However,as the soil initial moisture content increased,the difference of water infiltration duration between biochar treatment and control gradually decreased.Thus,biochar amendment under high soil initial water content,for example,rainfall or irrigation,can significantly affect water infiltration into the saline soil.The fitting coefficient of Philip and Kostiakov model was more than 0.99,indicating that the model was suitable for simulation of water infiltration in the biochar-amended soil.更多还原