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Straw mineralization and carbon dioxide emissions in soils with different salinity levels

文献类型： 外文期刊

作者： Shi, Cailing 1 ; Zhang, Jing 2 ; Zhang, Haibo 2 ; Xu, Lei 1 ; Xie, Wenjun 1 ; Li, Weiming 1 ; Zhang, Lichang 1 ; Sun, Yu 4 ;

作者机构： 1.Qingdao Univ Technol, Sch Environm & Municipal Engn, Qingdao 266520, Peoples R China

2.Chinese Acad Sci, Yantai Inst Coastal Zone Res, Yantai 264003, Peoples R China

3.Laishan Forestry Resource Monitoring & Protect Ctr, Yantai 264000, Peoples R China

4.Hebei Acad Agr & Forestry Sci, Coastal Agr Res Inst, Tangshan 063299, Peoples R China

期刊名称：ENVIRONMENTAL SCIENCE-PROCESSES & IMPACTS （ 影响因子：3.9； 五年影响因子：5.4 ）

ISSN： 2050-7887

年卷期： 2025 年 27 卷 3 期

页码：

收录情况： SCI

摘要： Straw application is widely used to reclaim saline soils. However, the characteristics of straw mineralization and its induced priming effects (PE) in saline soil are largely unknown. Thus, we conducted a 180-day saline soil incubation experiment to observe the characteristics of straw mineralization and CO2 emissions. Four salinity levels, i.e., 3.0 g kg(-1) (BS), 5.0 g kg(-1) (LS), 10.0 g kg(-1) (MS), and 15.0 g kg(-1) (HS), were established, to which C-13-labeled maize straw was added at a rate of 5.0%. Results showed that the straw mineralization rate and the amount of potentially mineralized straw significantly decreased with increasing salinity (p < 0.05). Compared with BS, the cumulative CO2 emissions, PE, and the amount of mineralized straw in LS, MS, and HS decreased by 3.6%-26.8%, 3.4%-26.5%, and 2.7%-15.6%, respectively. Simultaneously, increasing soil salinity prompted the earlier occurrence of the peak straw mineralization and PE. The contribution of straw mineralization to CO2 emissions on the 1st day significantly decreased with rising salinity levels (p < 0.05), while the opposite change was observed from 5 days to 120 days. Although PE significantly decreased with increasing salinity, the duration of the effect of straw input on soil organic matter mineralization increased substantially in high-salinity soils. These findings reveal the influence of soil salinity levels on the straw mineralization process and CO2 emission, which will help us assess and boost carbon sequestration in saline soils under straw input conditions.

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