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活性有机碳含量和土壤团聚体的形成与稳定在长期人为扰动土壤上有重要作用。通过分析稻麦轮作土壤上长期(>20年)施用畜禽粪便和化肥土壤活性有机碳含量、团聚体稳定性及活性有机碳与团聚体稳定性的关系,研究了人为扰动下土壤施肥管理对土壤活性碳和团聚体稳定性的影响。研究结果显示,与施用化肥比较,施用畜禽粪便显著提高了土壤总有机碳(SOC)和颗粒有机碳(POC)、可溶性有机碳(DOC)、热水提取态有机碳(HWOC)及土壤碳水化合物态碳(SCC)等活性有机碳库含量(p<0.05),其中HWOC含量是施用化肥处理的1.7～2.4倍。施用畜禽粪便土壤团聚体稳定性指数大团聚体颗粒百分含量(PMI)、抗糊化指数(ASI)和标准化平均重量直径(NMWD)指数分别是施用化肥土壤的1.31,3.39,2.14倍,显著高于施用化肥土壤(p<0.05),其中施用猪粪处理土壤团聚体稳定性最高。稳定性评价指数PMI、ASI以及NMWD间有极显著相关(p<0.01)。SOC和POC含量与土壤团聚体稳定性指数间没有相关性(p>0.05);SCC与团聚体稳定性指数间相关性较弱;DOC和HWOC与团聚体稳定性指数间则表现为显著或极显著相关。研究结果说明,施用畜禽粪便比化肥更有利于提高人为扰动土壤中总有机碳和活性有机碳含量及土壤团聚体稳定性,土壤活性有机碳是团聚体形成与稳定过程中重要影响因素,但受土壤发育母质等因素影响,不同土壤上其作用效果有一定差异。
Active organic carbon content and formation and stabilization of soil aggregates play an important role in long-term man-made disturbance of soil. The relationship between soil active organic carbon content, aggregate stability and the stability of activated carbon and soil aggregates in long-term (> 20 years) application of manure and fertilizers on paddy soil was analyzed. Effects of Soil Activated Carbon and Aggregate Stability. The results showed that compared with the application of chemical fertilizers, the application of manure significantly increased soil total organic carbon (SOC) and particulate organic carbon (POC), dissolved organic carbon (DOC), hot organic matter extracted (HWOC) (SCC) and other active organic carbon pools (p <0.05), of which HWOC content was 1.7 ~ 2.4 times higher than that of chemical fertilizers. Application of livestock manure soil aggregate stability index Large aggregate particle percentage (PMI), anti-gelatinization index (ASI) and standardized average weight diameter (NMWD) index were 1.31,3.32,2.14 times the application of fertilizer soil, Was significantly higher than the application of fertilizers soil (p <0.05), of which pig manure application soil aggregates highest stability. The stability assessment index PMI, ASI and NMWD were significantly correlated (p <0.01). There was no correlation between SOC and POC content and soil aggregate stability index (p> 0.05); the correlation between SCC and aggregate stability index was weak; while between DOC and HWOC and aggregate stability index was significant Significant correlation. The results showed that the application of animal manure was more beneficial than the chemical fertilizers in improving man-made disturbance of soil total organic carbon and active organic carbon content and soil aggregate stability, soil active organic carbon is an important factor in the formation and stability of aggregates, but Affected by soil development and other factors, the effect of different soil has a certain difference.