| Changes in soil organic carbon under long\|term straw incorporation in fluvo\|aquic soil of the North China Plain |
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| DOI：10.7606/j.issn.1000-7601.2025.01.14 |
| Key Words: straw incorporation fluvo\|aquic soil organic carbon carbon sequestration rate crop yield |
| Author Name | Affiliation | | LIU Xuetong | Dryland Farming Institute of Hebei Academy of Agriculture and Forestry Sciences, Hengshui, Hebei 053000, China；National Soil Quality Shenzhou Scientific Observation and Experimental Station, Shenzhou, Hebei 052800, China | | CAO Caiyun | Dryland Farming Institute of Hebei Academy of Agriculture and Forestry Sciences, Hengshui, Hebei 053000, China；National Soil Quality Shenzhou Scientific Observation and Experimental Station, Shenzhou, Hebei 052800, China；The Key Laboratory of Crop Drought\|Resistance Research of Hebei Province, Hengshui, Hebei 053000, China | | DANG Hongkai | Dryland Farming Institute of Hebei Academy of Agriculture and Forestry Sciences, Hengshui, Hebei 053000, China；National Soil Quality Shenzhou Scientific Observation and Experimental Station, Shenzhou, Hebei 052800, China | | MA Junyong | Dryland Farming Institute of Hebei Academy of Agriculture and Forestry Sciences, Hengshui, Hebei 053000, China；National Soil Quality Shenzhou Scientific Observation and Experimental Station, Shenzhou, Hebei 052800, China；The Key Laboratory of Crop Drought\|Resistance Research of Hebei Province, Hengshui, Hebei 053000, China | | LI Kejiang | Dryland Farming Institute of Hebei Academy of Agriculture and Forestry Sciences, Hengshui, Hebei 053000, China；National Soil Quality Shenzhou Scientific Observation and Experimental Station, Shenzhou, Hebei 052800, China；The Key Laboratory of Crop Drought\|Resistance Research of Hebei Province, Hengshui, Hebei 053000, China | | ZHENG Chunlian | Dryland Farming Institute of Hebei Academy of Agriculture and Forestry Sciences, Hengshui, Hebei 053000, China；National Soil Quality Shenzhou Scientific Observation and Experimental Station, Shenzhou, Hebei 052800, China | | LI Yueying | Hengshui Meteorological Service, Hengshui, Hebei 053000, China |
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| Abstract: |
| To establish a scientific foundation for optimizing soil organic carbon and enhancing fluvo\|aquic soil fertility, a long\|term field experiment on the winter wheat\|summer maize rotation system was conducted from 1981 to 2021 in the North China Plain. A total of 5 treatments including no\|fertilizer control (CK) and maize straw incorporation at rates of 0 kg·hm-2 (S0), 2 250 kg·hm-2 (S2250), 4 500 kg·hm-2 (S4500) and 9 000 kg·hm-2 (S9000) combined with inorganic fertilizers were set up. Soil samples (0~20 cm) were collected to study the changes of soil organic carbon content in each plot after maize harvest in 2021. The changes of soil organic carbon in 40 years were analyzed and the relationship between crop yield and soil organic carbon content was simulated. The results showed that after 40 years of straw incorporation, the organic carbon contents were increased by 21.91%~50.33% in other fertilizers treatments compared with CK. The organic carbon content in the S2250, S4500, and S9000 treatments gradually increased with the amount of straw incorporation, however, no significant differences were observed among them. Long\|term cultivation and fertilization increased soil organic carbon storage. After 40 years，the soil organic carbon storage in each treatment increased by 13.64~24.50 t·hm-2. The average carbon sequestration rate also gradually increased with the increase in straw incorporation, and it reached 0.61 t·hm-2·a-1 in the S9000 treatment, which was increased 45.2% than S0 treatment. In conclusion，long\|term straw incorporation promotes surface soil organic carbon accumulation and improves soil carbon sequestration rate in fluvo\|aquic soil. |
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