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| Effects of reduced nitrogen fertilization on the carbon sequestration of iron and aluminum oxides in typical Shajiang black soil under straw returning conditions |
| Received:March 12, 2025 |
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| KeyWord:Shajiang black soil;nitrogen level;iron-aluminum oxides;mineral-bound organic carbon |
| Author Name | Affiliation | E-mail | | KONG Jiaming | Anhui Province Key Lab of Farmland Ecological Conservation and Nutrient Utilization/Anhui Province Engineering and Technology Research Center of Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer/Key Laboratory of JiangHuai Arable Land Resources Protection and Eco-restoration, Ministry of Natural Resources/School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | WANG Wei | Anhui Province Key Lab of Farmland Ecological Conservation and Nutrient Utilization/Anhui Province Engineering and Technology Research Center of Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer/Key Laboratory of JiangHuai Arable Land Resources Protection and Eco-restoration, Ministry of Natural Resources/School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | PAN Wenyan | Anhui Province Key Lab of Farmland Ecological Conservation and Nutrient Utilization/Anhui Province Engineering and Technology Research Center of Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer/Key Laboratory of JiangHuai Arable Land Resources Protection and Eco-restoration, Ministry of Natural Resources/School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | ZHANG Chenkang | Anhui Province Key Lab of Farmland Ecological Conservation and Nutrient Utilization/Anhui Province Engineering and Technology Research Center of Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer/Key Laboratory of JiangHuai Arable Land Resources Protection and Eco-restoration, Ministry of Natural Resources/School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | WANG Qingyun | Anhui Province Key Lab of Farmland Ecological Conservation and Nutrient Utilization/Anhui Province Engineering and Technology Research Center of Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer/Key Laboratory of JiangHuai Arable Land Resources Protection and Eco-restoration, Ministry of Natural Resources/School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | qywang@ahau.edu.cn | | CHAI Rushan | Anhui Province Key Lab of Farmland Ecological Conservation and Nutrient Utilization/Anhui Province Engineering and Technology Research Center of Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer/Key Laboratory of JiangHuai Arable Land Resources Protection and Eco-restoration, Ministry of Natural Resources/School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | MO Luoyan | Anhui Province Key Lab of Farmland Ecological Conservation and Nutrient Utilization/Anhui Province Engineering and Technology Research Center of Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer/Key Laboratory of JiangHuai Arable Land Resources Protection and Eco-restoration, Ministry of Natural Resources/School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | XU Dianhong | Anhui Province Key Lab of Farmland Ecological Conservation and Nutrient Utilization/Anhui Province Engineering and Technology Research Center of Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer/Key Laboratory of JiangHuai Arable Land Resources Protection and Eco-restoration, Ministry of Natural Resources/School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | JIANG Wen | Anhui Province Key Lab of Farmland Ecological Conservation and Nutrient Utilization/Anhui Province Engineering and Technology Research Center of Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer/Key Laboratory of JiangHuai Arable Land Resources Protection and Eco-restoration, Ministry of Natural Resources/School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | LIU Jiaqiang | Anhui Province Key Lab of Farmland Ecological Conservation and Nutrient Utilization/Anhui Province Engineering and Technology Research Center of Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer/Key Laboratory of JiangHuai Arable Land Resources Protection and Eco-restoration, Ministry of Natural Resources/School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | |
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| Abstract: |
| To investigate the role of iron and aluminum oxides in stabilizing soil organic carbon under varying nitrogen conditions in Shajiang black soil, a long-term nitrogen fertilizer reduction field experiment（commenced in 2017）was conducted. This study aimed to examine the alterations in iron and aluminum oxides and their correlations with soil organic carbon content and composition across different nitrogen application levels. The experiment comprised three treatments：no nitrogen application（CK）, nitrogen application at 157.5 kg·hm-2 （NL1）, and nitrogen application at 225.0 kg·hm-2（NL2）, with each plot measuring 60 m2 and featuring three replicates. The results indicated that nitrogen application increased alkali-hydrolyzable nitrogen content but decreased soil pH. The contents of amorphous and complexed iron and aluminum oxides were elevated. Free iron and aluminum oxides were significantly positively correlated with soil organic carbon. Compared with the CK, NL1 and NL2 treatments increased free iron and aluminum oxides by 18.10%-19.84% and 22.99%-40.23%, respectively. The proportion of iron and aluminum-bound organic carbon in the NL1 and NL2 treatments increased by 5.44 and 1.67 percentage points, respectively, while the proportion of tightly bound organic carbon decreased by 8.96 and 12.39 percentage points, respectively. In the heavy fraction organic carbon, the relative intensity of polysaccharides was in the order CK>NL1>NL2, whereas the relative intensities of phenolics, aromatics, carbonyls, and aliphatics followed the order NL2>NL1>CK. The relative intensity trend of each functional group in non-calcium and magnesium-bound and tightly bound organic carbon was opposite to that in heavy fraction organic carbon. In summary, nitrogen application enhanced the content of various forms of iron and aluminum oxides in Shajiang black soil, reduced the proportion of tightly bound organic carbon, increased the proportion of iron and aluminum-bound organic carbon, and improved the stability of the heavy fraction organic carbon in Shajiang black soil. |
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