生物炭
导水率
土壤水分
保水性
多孔性
蒸发
土壤科学
环境科学
吸水率
修正案
化学
材料科学
复合材料
热解
物理
热力学
有机化学
法学
政治学
作者
Jun Zhang,Qun Chen,Changfu You
出处
期刊:Pedosphere
[Elsevier]
日期:2016-04-01
卷期号:26 (2): 265-272
被引量:94
标识
DOI:10.1016/s1002-0160(15)60041-8
摘要
Biochar, as a kind of soil amendment, has important effects on soil water retention. In this research, 4 different kinds of biochars were used to investigate their influences on hydraulic properties and water evaporation in a sandy soil from Hebei Province, China. Biochar had strong absorption ability in the sandy soil. The ratio of water content in the biochar to that in the sandy soil was less than the corresponding ratio of porosity. Because of the different hydraulic properties between the sandy soil and the biochar, the saturated hydraulic conductivity of the sandy soil gradually decreased with the increasing biochar addition. The biochar with larger pore volume and average pore diameter had better water retention. More water was retained in the sandy soil when the biochar was added in a single layer, but not when the biochar was uniformly mixed with soil. Particle size of the added biochar had a significant influence on the hydraulic properties of the mixture of sand and biochar. Grinding the biochar into powder destroyed the pore structure, which simultaneously reduced the water absorption ability and hydraulic conductivity of the biochar. For this reason, adding biochar powder to the sandy soil would not decrease the water evaporation loss of the soil itself.
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