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生物炭不同粒径及不同添加量对土壤收缩特征的影响
其他题名Effects of Different Sizes of Biochar and Their Additiont Rates
文曼; 郑纪勇
2012
发表期刊水土保持研究
卷号19期号:01页码:46-50
摘要土壤收缩特征在准确定量评价土壤结构和水力学特性中发挥重要作用。生物炭孔隙结构发达、比表面积巨大,施加生物炭不仅可以改变土壤的生物、化学性质,而且还影响到土壤的收缩特性。利用离心机法测定了添加不同粒径(2~1mm,1~0.25mm,<0.25mm)、不同比例(0,10,50,100,150g/kg)生物炭的土壤收缩特征,并采用三直线模型进行了模拟,得出如下结果:相同压力下,土壤比容积随着生物炭含量增加而增大,生物炭有效地限制了土壤收缩。土壤收缩变化过程适用三直线模型描述,伪饱和段和结构段的收缩特征值随生物炭含量增加而减小,超正常段的土壤特征值随生物炭含量增加而增大;生物炭粒径对土壤收缩特征值变化的影响不显著。研究表明,向土壤中添加生物炭能有效降低土壤干燥过程中的收缩程度,改善土壤结构,提高土壤持水性能。 ; Abstract:Soil shrinkage characteristics play a key role in the quantitative evaluation on soil structure and hydraulic
 properties.Because of the highly developed porous structure and huge specific surface area,biochar
addition into soil can not only change the soil biochemical properties,but also affect the soil shrinkage characteristics.
In this paper,the effects of application of 3biochar sizes(2~1mm,1~0.25mm,<0.25mm)
and 5application rates(0,10,50,100,150g/kg)on soil shrinkage characteristics were examined by using
centrifugal method.The relationships between the soil specific volume with the pressure and the water content
 were fitted by using power function and the three straight lines model,respectively.The results showed
the power function and the three straight lines model could well simulate the changes of the soil specific volume
 with the pressure and the water content.The biochar addition significantly changed the soil shrinkage
properties,and the soil specific volume increased with the rise of the biochar addition rates under the same
pressure condition.The soil shrinkage characteristics values decreased with the increasing proportion of biochar
 application at the false saturated stage and structure stage,but it increased at the super normal stage.
The effects of different particle sizes of biochar on the soil shrinkage characteristics were not statistically significant.
The results indicated that addition of the biochar into soil could reduce the soil shrinkage during the
soil desiccation and improve the soil structure and water retention capability.
关键词生物炭 Iochar 土壤收缩特征 Soil shrinkage characteristics 三直线模型 Three straight lines model
语种中文
文献类型期刊论文
条目标识符sbir.nwafu.edu.cn/handle/361005/5272
专题水保所知识产出(1956---)
推荐引用方式
GB/T 7714
文曼,郑纪勇. 生物炭不同粒径及不同添加量对土壤收缩特征的影响[J]. 水土保持研究,2012,19(01):46-50.
APA 文曼,&郑纪勇.(2012).生物炭不同粒径及不同添加量对土壤收缩特征的影响.水土保持研究,19(01),46-50.
MLA 文曼,et al."生物炭不同粒径及不同添加量对土壤收缩特征的影响".水土保持研究 19.01(2012):46-50.
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