Behavior of soil aggregates in reclaimed farmland with different restoration durations: Mediating factors and mechanisms
The recovery of soil aggregates is crucial for improving soil quality in highly compacted reclaimed farmlands in coal mining subsidence areas. This study aimed to explore the key factors and mechanisms affecting aggregate recovery in reclaimed mine soil (RMS). Surface soil samples (0 ∼ 20 cm) were c...
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| Language: | English |
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Elsevier
2025-01-01
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| Series: | Geoderma |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0016706124003690 |
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| author | Zhaoxinyu Liu Junying Li Lina Gao Xinju Li Wen Song Luofan Li Yulong Zang Gengdi Zhang |
| author_facet | Zhaoxinyu Liu Junying Li Lina Gao Xinju Li Wen Song Luofan Li Yulong Zang Gengdi Zhang |
| author_sort | Zhaoxinyu Liu |
| collection | DOAJ |
| description | The recovery of soil aggregates is crucial for improving soil quality in highly compacted reclaimed farmlands in coal mining subsidence areas. This study aimed to explore the key factors and mechanisms affecting aggregate recovery in reclaimed mine soil (RMS). Surface soil samples (0 ∼ 20 cm) were collected from reclaimed farmlands with varying reclamation durations (0, 2, 6, 12, 16, and 22 years) and adjacent non-subsidence cultivated soil (NCS). A total of 20 soil indicators were analyzed. Complex network theory was then applied to explore their interrelationships and identify critical factors influencing aggregate distribution. The results showed that mechanical compaction during geomorphic reshaping disrupted macroaggregates, reduced aggregate stability, accelerated organic carbon mineralization, and diminished microbial activity. This also resulted in increased complexity and disorder of soil property interactions. After 22 years of reclamation, the proportion of 2 ∼ 0.25 mm aggregates increased by 25.92 %, while 0.25 ∼ 0.053 mm aggregates decreased by 40.93 %. The mean weight diameter and geometric mean diameter increased by 34.48 % and 69.54 %, respectively. Soil organic carbon (SOC) increased by 250.94 %, and microbial biomass by 123.07 %. However, RMS still exhibited differences in aggregate distribution, stability, SOC accumulation, and system functionality compared with the NCS. Soil aggregates, particularly macroaggregates, served as mediators within the RMS system. In the early stages of reclamation, inorganic cementing agents were crucial for maintaining RMS aggregation and SOC sequestration. Over time, particulate organic carbon and microbial activity became dominant in aggregate formation. Iron-aluminum oxides, particularly amorphous forms, facilitated macroaggregate formation and SOC stabilization. |
| format | Article |
| id | doaj-art-d3a47be51da84f56ac5dd8efc692081a |
| institution | Kabale University |
| issn | 1872-6259 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Geoderma |
| spelling | doaj-art-d3a47be51da84f56ac5dd8efc692081a2025-01-10T04:36:43ZengElsevierGeoderma1872-62592025-01-01453117140Behavior of soil aggregates in reclaimed farmland with different restoration durations: Mediating factors and mechanismsZhaoxinyu Liu0Junying Li1Lina Gao2Xinju Li3Wen Song4Luofan Li5Yulong Zang6Gengdi Zhang7College of Resources and Environment, Shandong Agricultural University, Taian 271018, China; National Engineering Research Center for Efficient Utilization of Soil and Fertilizer Resources, Taian 271018, ChinaCollege of Resources and Environment, Shandong Agricultural University, Taian 271018, China; National Engineering Research Center for Efficient Utilization of Soil and Fertilizer Resources, Taian 271018, ChinaShandong Provincial Territorial Spatial Ecological Restoration Center, Jinan 250014, ChinaCollege of Resources and Environment, Shandong Agricultural University, Taian 271018, China; National Engineering Research Center for Efficient Utilization of Soil and Fertilizer Resources, Taian 271018, ChinaCollege of Resources and Environment, Shandong Agricultural University, Taian 271018, China; National Engineering Research Center for Efficient Utilization of Soil and Fertilizer Resources, Taian 271018, China; Corresponding author.College of Resources and Environment, Shandong Agricultural University, Taian 271018, China; National Engineering Research Center for Efficient Utilization of Soil and Fertilizer Resources, Taian 271018, ChinaCollege of Resources and Environment, Shandong Agricultural University, Taian 271018, China; National Engineering Research Center for Efficient Utilization of Soil and Fertilizer Resources, Taian 271018, ChinaCollege of Resources and Environment, Shandong Agricultural University, Taian 271018, China; National Engineering Research Center for Efficient Utilization of Soil and Fertilizer Resources, Taian 271018, ChinaThe recovery of soil aggregates is crucial for improving soil quality in highly compacted reclaimed farmlands in coal mining subsidence areas. This study aimed to explore the key factors and mechanisms affecting aggregate recovery in reclaimed mine soil (RMS). Surface soil samples (0 ∼ 20 cm) were collected from reclaimed farmlands with varying reclamation durations (0, 2, 6, 12, 16, and 22 years) and adjacent non-subsidence cultivated soil (NCS). A total of 20 soil indicators were analyzed. Complex network theory was then applied to explore their interrelationships and identify critical factors influencing aggregate distribution. The results showed that mechanical compaction during geomorphic reshaping disrupted macroaggregates, reduced aggregate stability, accelerated organic carbon mineralization, and diminished microbial activity. This also resulted in increased complexity and disorder of soil property interactions. After 22 years of reclamation, the proportion of 2 ∼ 0.25 mm aggregates increased by 25.92 %, while 0.25 ∼ 0.053 mm aggregates decreased by 40.93 %. The mean weight diameter and geometric mean diameter increased by 34.48 % and 69.54 %, respectively. Soil organic carbon (SOC) increased by 250.94 %, and microbial biomass by 123.07 %. However, RMS still exhibited differences in aggregate distribution, stability, SOC accumulation, and system functionality compared with the NCS. Soil aggregates, particularly macroaggregates, served as mediators within the RMS system. In the early stages of reclamation, inorganic cementing agents were crucial for maintaining RMS aggregation and SOC sequestration. Over time, particulate organic carbon and microbial activity became dominant in aggregate formation. Iron-aluminum oxides, particularly amorphous forms, facilitated macroaggregate formation and SOC stabilization.http://www.sciencedirect.com/science/article/pii/S0016706124003690Coal mining subsidenceLand reclamationSoil compactionSoil aggregatesComplex network |
| spellingShingle | Zhaoxinyu Liu Junying Li Lina Gao Xinju Li Wen Song Luofan Li Yulong Zang Gengdi Zhang Behavior of soil aggregates in reclaimed farmland with different restoration durations: Mediating factors and mechanisms Geoderma Coal mining subsidence Land reclamation Soil compaction Soil aggregates Complex network |
| title | Behavior of soil aggregates in reclaimed farmland with different restoration durations: Mediating factors and mechanisms |
| title_full | Behavior of soil aggregates in reclaimed farmland with different restoration durations: Mediating factors and mechanisms |
| title_fullStr | Behavior of soil aggregates in reclaimed farmland with different restoration durations: Mediating factors and mechanisms |
| title_full_unstemmed | Behavior of soil aggregates in reclaimed farmland with different restoration durations: Mediating factors and mechanisms |
| title_short | Behavior of soil aggregates in reclaimed farmland with different restoration durations: Mediating factors and mechanisms |
| title_sort | behavior of soil aggregates in reclaimed farmland with different restoration durations mediating factors and mechanisms |
| topic | Coal mining subsidence Land reclamation Soil compaction Soil aggregates Complex network |
| url | http://www.sciencedirect.com/science/article/pii/S0016706124003690 |
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