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中文摘要：
选取壤砂土、壤土和粉粘壤，分别添加0％、3％、6％的细碳和粗碳，通过测定水分特征曲线，探究2种粒径的生物碳对不同质地土壤水分物理特性的影响。结果表明，2种粒径生物碳的添加均可提高壤砂土的保水能力，降低粉粘壤的保水能力；粗碳的添加可提高壤土的保水能力，而细碳对壤土的保水能力影响不明显。生物碳添加比例为3％时，细碳和粗碳对3种质地土壤保水能力的影响差异不大；生物碳添加比例为6％时，细碳对壤砂土保水性能的提高更大．而粗碳对壤土保水性能的提高更大。生物碳对土壤保水能力的影响取决于土壤质地、生物碳的粒径及添加比例。
英文摘要：
The effects of biochar on soil water characteristic curve were studied through adding fine biochar and coarse biochar with the rates of 0%, 3%, 5% to loamy sand, loam, silty clay loam. Results showed that： fine biochar and coarse biochar both increased water retention of loamy sand and reduced water retention of silty clay loam. Coarse biochar increased water retention of loam, but there was no effect of fine biochar on water retention of loam. The effects of fine biochar and coarse biochar on three types of soils were similar with biochar rate of 3%. Wilh biochar rate of 6%, fine biochar increased the waler retention of loamy sand observably while coarse biochar increased the water retention of loam significantly. Therefore, effects of biochar on soil water retention depended on soil texture, biochar particle size and biochar rate.
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