| Effects of equal\|nitrogen substitution of chemical fertilizers with soil amendments on organic carbon fractions and microbial communities in coastal saline soil |
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| DOI：10.7606/j.issn.1000-7601.2026.04.29 |
| Key Words: soil amendment equal\|nitrogen substitution coastal saline soil organic carbon fractions carbon pool management index microbial community |
| Author Name | Affiliation | | LI Hao | Institute of Coastal Agriculture, Hebei Academy of Agriculture and Forestry Sciences, Saline\|alkali Land Greening Technology Innovation Center of Hebei Province, Tangshan, Hebei 063200, China | | ZHAO Zijing | Institute of Coastal Agriculture, Hebei Academy of Agriculture and Forestry Sciences, Saline\|alkali Land Greening Technology Innovation Center of Hebei Province, Tangshan, Hebei 063200, China | | DAI Xianglin | Institute of Coastal Agriculture, Hebei Academy of Agriculture and Forestry Sciences, Saline\|alkali Land Greening Technology Innovation Center of Hebei Province, Tangshan, Hebei 063200, China | | SUN Jianping | Institute of Coastal Agriculture, Hebei Academy of Agriculture and Forestry Sciences, Saline\|alkali Land Greening Technology Innovation Center of Hebei Province, Tangshan, Hebei 063200, China | | LI Xiaoxue | Institute of Coastal Agriculture, Hebei Academy of Agriculture and Forestry Sciences, Saline\|alkali Land Greening Technology Innovation Center of Hebei Province, Tangshan, Hebei 063200, China | | YAO Yutao | Institute of Coastal Agriculture, Hebei Academy of Agriculture and Forestry Sciences, Saline\|alkali Land Greening Technology Innovation Center of Hebei Province, Tangshan, Hebei 063200, China | | LIU Yahui | Institute of Coastal Agriculture, Hebei Academy of Agriculture and Forestry Sciences, Saline\|alkali Land Greening Technology Innovation Center of Hebei Province, Tangshan, Hebei 063200, China |
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| Abstract: |
| To investigate the regulatory effects of equal\|nitrogen substitution of chemical fertilisers with a selfdeveloped composite soil amendment on soil fertility and microbial ecology of coastal saline soil, the typical saline soil in Caofeidian District, Hebei Province, was taken as the object, and four gradients of 0% (F, full application of conventional chemical fertilizers), 10% (AF1), 30% (AF2), and 50% (AF3) amendment were set to replace nitrogen fertilizer, and no nitrogen fertilizer treatment was used as the control (CK). The variation characteristics of soil physicochemical properties, organic carbon fractions, and microbial community structure were systematically characterised across different maize growth stages. The results showed that at the maturity stage of maize, the 50% amendment substitution treatment (AF3) had the best effect on improving saline\|alkali and activating available nutrients. The soil salt content decreased by 10.34% compared with CK, and the soil pH decreased by 1.26% compared with F treatment. The contents of soil available phosphorus and available potassium increased by 106.39% and 23.87%, respectively, compared with the F treatment. The 30% amendment substitution treatment (AF2) had the best comprehensive effect on carbon sequestration, soil fertility enhancement, and microbial community optimization. The soil total organic carbon (TOC), easily oxidisable organic carbon (EOC), microbial biomass carbon (MBC), and dissolved organic carbon (DOC) at maturity stage were 27.22%, 44.04%, 18.95%, and 10.01% higher than those of the F treatment, respectively. The carbon pool management index (CPMI) increased by 47.58%. Compared with F treatment, the abundance based coverage estimator (ACE) index of bacteria and fungi in AF2 increased by 6.11% and 14.97%, respectively, and the relative abundance of salt\| and alkali\|tolerant family Bacillaceae increased by 5.67%. The β diversity of the soil microbial community showed significant divergence. Pearson correlation analysis showed that soil organic carbon fractions, pH, and available nutrients were highly correlated with the abundance of dominant bacteria families. In conclusion, 30% equal\|nitrogen substitution with the composite amendment can significantly increase soil carbon storage and improve microbial community structure, which is suitable for carbon sequestration and fertilization of coastal saline soil. 50% equal\|nitrogen substitution with the composite amendment has outstanding advantages in reducing soil salinity and improving soil available phosphorus and potassium nutrients, which can be targeted to impove costal servere saline soil. |
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