| 引用本文: | 郑 健,范盼盼,马 彪,等.沼液沼渣协同作用对土壤水分入渗、蒸发及
有机质量影响的试验研究[J].灌溉排水学报,2026,45(7):101-113. |
| Zheng Jian,Fan Panpan,Ma Biao,et al.沼液沼渣协同作用对土壤水分入渗、蒸发及
有机质量影响的试验研究[J].灌溉排水学报,2026,45(7):101-113. |
|
| 摘要: |
| 【目的】揭示沼液沼渣协同作用对土壤水分运动规律影响的机理。【方法】设置4个沼渣混掺量（沼渣占土壤质量百分比）：0%（S0）、1%（S1）、2%（S2）、4%（S4）和3个沼液配比水平（沼液：水，体积比）：0（W0）、1∶8（W1:8）和1∶4（W1:4），采用室内试验探求不同处理对土壤持水性能、入渗湿润锋、累积入渗量、累积蒸发量、温度日变幅和有机质量的响应规律，并采用幂函数模型、Kostiakov模型和Rose模型对湿润锋运移、累积入渗量和累积蒸发量的动态变化进行了拟合分析。【结果】①土壤持水能力的提升与沼渣混掺量及沼液施用配比呈正相关，S4W1:4处理的土壤体积含水率较S0W0处理提高了15.84%，van-Genuchten模型可以精确拟合各处理土壤水分特征曲线（R2≥0.998 5），二者分别与土壤中较小孔隙、较大孔隙占比呈正、负相关关系。②随沼液配比和沼渣混掺量的增加，延缓水分入渗的效果越明显，相同灌溉量（120 mm）下S4W1:4 处理所需时间较S0W0处理延迟了106.49%，幂函数能够准确描述湿润锋运移距离Z（cm）与入渗时间t（min）的关系（R2≥0.993 2；RRMSE≤ 5.50%；NS≥0.993 4），Kostiakov入渗模型能较好模拟不同处理的累积入渗量I（mm）和入渗时间t（min）之间的关系（R2≥0.994 7；RRMSE≤5.95%；NS≥0.992 5）。③土壤累积蒸发量随沼渣混掺量的增加呈先升高后降低的趋势，随沼液配比的增大而趋于减小，S4W1:4处理下土壤累积蒸发量最小（32.34 mm），Rose模型可以准确描述累积蒸发量E（mm）与时间t（d）的关系（R2≥0.953 5；RRMSE≤4.88%；NS≥0.958 7）；各土层温度日变幅随沼渣混掺量的增加呈先增大后减小的趋势，沼液灌溉降低了各土层温度日变幅，沼液配比为1∶4时各土层内温度日变幅值达到最低；土壤有机质量与沼渣混掺量及沼液施用配比呈正相关。【结论】沼渣混掺量4%、沼液配比1∶4处理能够更好地平衡粉壤土的入渗和蒸发特性。 |
| 关键词: 沼液；沼渣；土壤水分特征曲线；蒸发量；入渗量；土壤温度；有机质 |
| DOI：10.13522/j.cnki.ggps.2025326 |
| 分类号: |
| 基金项目: |
|
| Synergistic effects of biogas slurry and biogas residue applications on soil water movement, thermal regime and organic matter content |
|
Zheng Jian, Fan Panpan, Ma Biao, Liu Haitao, Wang Junjie, Guo Yajun
|
|
1. School of Civil and Hydraulic Engineering, Lanzhou University of Technology, Lanzhou 730050, China;
2. Key Laboratory of Multi-supply System with Solar Energy and Biomass, Gansu Province, Lanzhou 730050, China;
3. Key laboratory of Degraded and Unused Land Consolidation Engineering, the Ministry of Natural Resources,
Xi’an 710000, China; 4. Shaanxi Agricultural Development Group Co., Ltd., Xi’an 710000, China;
5. Shule River Basin Water Resources Utilization Center of Gansu Province, Yumen 735211, China
|
| Abstract: |
| 【Objective】Biogas slurry and residue are rich in nutrients, and their combined application can improve soil quality. This study experimentally investigates the synergistic effect of biogas slurry and biogas residue on soil water movement and soil organic matter.【Method】The laboratory infiltration experiment included four biogas residue application rates (mass of biogas residue/mass of soil): 0% (S0), 1% (S1), 2% (S2) and 4% (S4), and three biogas slurry concentration treatments (volumetric ratio of biogas slurry to water): 0 (W0), 1∶8 (W1:8) and 1∶4 (W1:4). For each treatment, we measured soil water-holding capacity, wetting front advancement, cumulative infiltration, cumulative evaporation, diurnal soil temperature variation, and soil organic matter content. Temporal variations in wetting front migration distance, cumulative infiltration, and cumulative evaporation were fitted to the power function, Kostiakov model and Rose model, respectively.【Result】①Soil water-holding capacity increased with increasing biogas residue application rate and biogas slurry concentration. The volumetric soil water content under S4W1:4 was 15.84% higher than that under S0W0. The water retention curves of all treatments were well fitted by the van-Genuchten model, with a coefficient of determination (R2) ≥ 0.998 5. ②Increasing biogas residue application and biogas slurry concentration remarkably reduced water infiltration. When irrigation was 120 mm, the S4W1:4 treatment prolonged the infiltration duration by 106.49% compared with S0W0. The relationship between wetting front distance and infiltration time can be described by a power-law function (R2 ≥ 0.993 2, RRMSE ≤ 0.055 0, NS ≥ 0.993 4). The Kostiakov model well described the temporal change in cumulative infiltration (R2 ≥ 0.994 7, RRMSE ≤ 0.059 5, NS ≥ 0.992 5). ③With the increase in biogas residue application rate, soil evaporation first increased and then decreased; increasing biogas slurry concentrations reduced soil evaporation. The cumulative evaporation in the S4W1:4 was 32.34 mm, the lowest among all treatments. The Rose model accurately described the temporal change in cumulative evaporation (R2≥ 0.953 5, RRMSE ≤ 0.048 8, NS ≥ 0.958 7). With increasing biogas residue application, the diurnal temperature amplitude of each soil layer initially increased and then decreased. Biogas slurry irrigation effectively reduced diurnal soil temperature variation. Soil organic matter content was positively correlated with both biogas residue application rate and biogas slurry concentration.【Conclusion】The combined application of 4% biogas residue and 1∶4 biogas slurry dilution can effectively balance soil water infiltration and evaporation in silty loam soil. |
| Key words: biogas slurry; digestate; soil moisture characteristic curve; cumulative evaporation; cumulative infiltration volume; soil temperature; organic matter |
