<b>Study on the correlation between long-term continuous application of biogas slurry and soil compaction</b>
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土壤压实已成为一个世界性问题。虽然有研究者提出施用沼气泥浆可能导致土壤压实，但目前尚无相关研究说明施用沼气泥浆导致土壤压实的原因。探讨沼浆施用量、施用方式和土壤结构的协同作用。通过田间试验，设置5个处理（对照（CK）、化肥与有机肥联合施用（CF+OF）、100%沼浆施肥（BS）、沼浆与有机肥联合施用（BS+OF）、50%沼浆与50%化肥联合施用（BS+CF））来研究沼气浆液连续施用与土壤压实的相关性。结果表明：CK、BS和BS+CF处理土壤有机质含量逐渐降低，而BS+OF和CF+OF处理则相反。土壤容重和压实度随有机质含量的增加而降低，而土壤总孔隙度和饱和水力传导率与有机质呈正相关。双指数平滑模型预测，CK、BS和BS+CF处理的土壤在连续利用12年、13年和14年后表现出压实度，而其他处理的土壤质量有所改善。综合分析得出结论，沼液与有机肥联合施用是沼液施用方式较为科学。
Soil compaction has emerged as a global environmental problem. While some researchers have suggested that the application of biogas slurry may cause soil compaction, there are currently no studies elucidating the specific mechanisms underlying biogas slurry-induced soil compaction. This study investigates the synergistic effects of biogas slurry application rate, application method and soil structure. A field experiment was established with five treatments: control (CK), combined application of chemical fertilizer and organic fertilizer (CF+OF), 100% biogas slurry application (BS), combined application of biogas slurry and organic fertilizer (BS+OF), and combined application of 50% biogas slurry and 50% chemical fertilizer (BS+CF), to explore the correlation between consecutive biogas slurry application and soil compaction. The results indicated that soil organic matter content gradually declined in the CK, BS and BS+CF treatments, whereas an opposite trend was observed in the BS+OF and CF+OF treatments. Soil bulk density and degree of compaction decreased with increasing soil organic matter content, while soil total porosity and saturated hydraulic conductivity exhibited positive correlations with organic matter content. Predictions using the double exponential smoothing model showed that soils under CK, BS and BS+CF treatments would develop compaction after 12, 13 and 14 years of consecutive utilization, respectively, while the other treatments improved soil quality. Comprehensive analysis concluded that combined application of biogas slurry and organic fertilizer represents a more scientific biogas slurry application strategy.
