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| 秸秆深耕还田对白浆土铁氧化物形态与有机碳累积的影响 |
| Effects of deep tillage with straw returning on iron oxide forms and soil organic carbon accumulation in albic soil |
| Received:March 31, 2025 |
| DOI：10.13254/j.jare.2025.0245 |
| 中文关键词: 秸秆还田，深耕，铁氧化物，有机碳，白浆土 |
| 英文关键词: straw returning, deep tillage, iron oxides, organic carbon, albic soil |
| 基金项目:国家重点研发计划项目（2022YFD1500305，2022YFD1500704）；黑龙江省玉米产业技术协同创新推广体系课题 |
| Author Name | Affiliation | E-mail | | Shi Yan | Suibin Branch of Beidahuang Agriculture Co., Ltd. Suibin 154213, China | | | Liu Zhengyu | Baoquanling Branch of Heilongjiang Beidahuang Modern Agricultural Service Co. Ltd., Jiamusi 154211, China | | | Li Yan | Heilongjiang Black Soil Conservation and Utilization Research Institute, Harbin 150086, China | | | Yu Hongjiu | Heilongjiang Black Soil Conservation and Utilization Research Institute, Harbin 150086, China | | | Wang Wei | Heilongjiang Black Soil Conservation and Utilization Research Institute, Harbin 150086, China | | | Cai Shanshan | Heilongjiang Black Soil Conservation and Utilization Research Institute, Harbin 150086, China | | | Gao Zhongchao | Heilongjiang Black Soil Conservation and Utilization Research Institute, Harbin 150086, China | | | Li Yumei | Heilongjiang Black Soil Conservation and Utilization Research Institute, Harbin 150086, China | liyumeiwxyl@126.com |
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| 中文摘要: |
| 铁氧化物作为土壤有机碳（SOC）的关键赋存介质，在土壤有机碳增汇过程中起到关键作用。本研究采用大田试验，研究秸秆和生物炭等有机物料深耕还田对白浆土铁氧化物形态、团聚体稳定性及有机碳累积的影响，明确铁氧化物形态分布与土壤SOC提高的关系。结果表明，秸秆深耕还田显著提高了土壤全铁（T-Fe）、有效铁（A-Fe）、游离态氧化铁（Fed）及无定形态氧化铁（Feo）含量；与常规耕作相比，秸秆深耕还田也显著提高了各粒级团聚体中SOC的含量，其中<0.053 mm团聚体中的SOC增幅最大（52.2%），其次是0.25~0.053 mm团聚体（48.8%），但以0.25~2 mm粒径团聚体中SOC的富集和贡献率最高；添加生物炭后，0~30 cm土层土壤A-Fe和络合态铁（Fep）含量增幅较大，较深耕还田分别增加了17.1%和46.4%；白浆土中Fed和Feo分别与各粒级水稳性团聚体中SOC呈显著（P<0.05）和极显著（P<0.01）正相关。秸秆周期深耕还田可提高白浆土有机质含量，影响土壤铁氧化物形态间的再分配。Fed对团聚体稳定性影响较大，其次是Feo态。研究结果可为优化秸秆资源利用、改良障碍性土壤提供依据。 |
| 英文摘要: |
| Iron oxides are vital to the sequestration as a key matrix for soil organic carbon（SOC）. Field experiments were used to study the effect of deep tillage and organic materials such as straw and biochar returning on the morphology of iron oxides, aggregate stability, and organic carbon accumulation in albic soil. Relationship between iron oxide morphological distribution and soil SOC improvement were clarified. The results showed that the content of total iron（T-Fe）, available iron（A-Fe）, free iron oxide（Fed）, and amorphous iron oxide （Feo）were significantly increased by deep tillage with straw returning. Content of SOC in various particle size aggregates was also significantly increased by deep tillage with straw returning compared with conventional tillage, and the largest increase was in <0.053 mm aggregates（52.2%）, followed by 0.25-0.053 mm aggregates（48.8%）, but the enrichment and contribution rate of SOC were highest in 0.25-2 mm particle size aggregates. After adding biochar, content of A-Fe and complexed iron oxide（Fep）in the 0-30 cm soil layer were also increased significantly with an increase of 17.1% and 46.4% respectively, compared to deep tillage with straw returning. Fed and Feo in albic soil were positively and significantly correlated with SOC in stable aggregates of various particle sizes（P<0.05, P<0.01）. The soil organic matter content of albic soil can be increased and the redistribution of iron oxide forms can be affected by deep tillage with straw returning. Fed has a significant impact on the stability of aggregates, followed by state of Feo, which could provide a basis for optimizing straw resource utilization and improving barrier soils. |
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