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生物炭具有丰富的微孔结构,能够影响土壤的持水性能,对植物生长和土壤中养分的保持有着重要意义。而土壤水分特征曲线又是表征土壤持水能力的一个重要指标。本文通过压力膜法测定添加不同比例生物炭的黄壤水分特征曲线,并结合van Genuchten模型对实测结果进行拟合,推导水动力学参数。结果表明,随着生物炭施入量的增加(0、5%、10%),土壤的田间持水量增加,凋萎含水量降低,土壤有效含水量增加。生物炭添加能够显著提高土壤的持水能力,增强水分的可利用性。同时,van Genuchten模型拟合结果同实测值高度相似,可以用作预测生物炭改良土壤的水动力学参数。
Biochar has a rich microporous structure, can affect the water holding capacity of the soil, the plant growth and nutrient retention in soil is of great significance. Soil water characteristic curve is also an important indicator of soil water holding capacity. In this paper, the water characteristics of yellow soil with different proportions of biochar were measured by pressure-membrane method. The hydrodynamic parameters were derived by fitting van Genuchten model with the measured data. The results showed that with the increase of biochar application rate (0, 5%, 10%), the soil water holding capacity increased, the wilting water content decreased, and the soil effective water content increased. Biochar addition can significantly increase soil water holding capacity and enhance water availability. Meanwhile, the van Genuchten model fitting results are highly similar to the observed values and can be used to predict the hydrodynamic parameters of biochar-amended soils.