有机肥通过改变设施土壤中氧化铁和有机碳的含量来提高土壤团聚体的稳定性

doi:10.1016/j.jia.2024.05.026

摘要/Abstract

摘要：

土壤有机碳（SOC）和氧化铁（Fe）是驱动土壤团聚体形成和稳定的重要因素。然而，在施用有机肥的设施土壤中，这些驱动因素的机制尚不清楚。我们在为期3年的田间试验中，研究影响设施土壤团聚体稳定性的因素。为了探讨有机肥对土壤团聚体的影响，我们共设四个处理：不施肥（CK）；无机肥料（CF）；有机肥（OF）；无机和有机肥配施（COF）。施用有机肥显著提高了团聚体的稳定性，即提高了>0.25 mm粒级团聚体含量、平均重量直径和几何平均直径。OF和COF处理增加了SOC含量，特别是提高了>0.25 mm粒级团聚体中构成SOC的脂芳碳、芳香碳和多糖碳含量。施用有机肥显著增加了土壤和团聚体中游离氧化铁（Fed）、无定形氧化铁（Feo）和非晶态铁的含量。此外，非晶态铁与土壤和团聚体中的SOC含量呈正相关。非晶态铁和SOC均与>2mm粒级MWD呈正相关。总体而言，我们认为施用有机肥后土壤中SOC、芳香碳和非晶态铁含量的增加是提高土壤团聚体稳定性的原因。

Abstract:

Both soil organic carbon (SOC) and iron (Fe) oxide content, among other factors, drive the formation and stability of soil aggregates. However, the mechanism of these drivers in greenhouse soil fertilized with organic fertilizer is not well understood. In a 3-year field experiment, we aimed to investigate the factors which drive the stability of soil aggregates in greenhouse soil. To explore the impact of organic fertilizer on soil aggregates, we established four treatments: no fertilization (CK); inorganic fertilizer (CF); organic fertilizer (OF); and combined application of inorganic and organic fertilizers (COF). The application of organic fertilizer significantly enhanced the stability of aggregates, that is it enhanced the mean weight diameter, geometric mean diameter and aggregate content (%) of >0.25 mm aggregate fractions. OF and COF treatments increased the concentration of SOC, especially the aliphatic-C, aromatic-C and polysaccharide-C components of SOC, particularly in >0.25 mm aggregates. Organic fertilizer application significantly increased the content of free Fe (Fed), reactive Fe (Feo), and non-crystalline Fe in both bulk soil and aggregates. Furthermore, non-crystalline Fe showed a positive correlation with SOC content in both bulk soil and aggregates. Both non-crystalline Fe and SOC were significantly positively correlated with >2 mm mean weight diameter. Overall, we believe that the increase of SOC, aromatic-C, and non-crystalline Fe concentrations in soil after the application of organic fertilizer is the reason for improving soil aggregate stability.

Key words: organic fertilizer , soil aggregates , soil organic carbon , iron oxides , greenhouse soil

Lijun Ren, Han Yang, Jin Li, Nan Zhang, Yanyu Han, Hongtao Zou, Yulong Zhang. 有机肥通过改变设施土壤中氧化铁和有机碳的含量来提高土壤团聚体的稳定性[J]. Journal of Integrative Agriculture, 2025, 24(1): 306-321.

Lijun Ren, Han Yang, Jin Li, Nan Zhang, Yanyu Han, Hongtao Zou, Yulong Zhang. Organic fertilizer enhances soil aggregate stability by altering greenhouse soil content of iron oxide and organic carbon[J]. Journal of Integrative Agriculture, 2025, 24(1): 306-321.

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