Maize straw-driven phosphorus mobilization in two alkaline soils: Microbial community shifts and agronomic implications
文献类型： 外文期刊
作者： Darma, Aminu;Jianjun, Yang;Jin, Liu;Meili, Sun;Jiaqi, Chen;Bloem, Elke;Tianwen, Chen
作者机构：
关键词： Dissolved organic carbon;Microbial shift;Phosphorus fractions;Straw decomposition
期刊名称： APPLIED SOIL ECOLOGY
ISSN： 0929-1393
年卷期： 2026 年 219 卷
页码：
收录情况： SCIE（2025版）
摘要： Straw incorporation enhances soil fertility; however, a clear gap remains regarding how varying rates of maize straw incorporation simultaneously influence P mobilization and the dynamics of P-solubilizing bacterial communities in alkaline soils. Therefore, a pot trial was conducted to examine the impacts of 1 % and 2 % maize straw (MS) application on soil P availability, bacterial community composition, and uptake by wheat crops in an irrigation (XA) and industrial (XI) alkaline polluted soils. The study findings demonstrated that incorporating 2 % MS considerably (P < 0.05) increased soil P availability in both soil types, rising from 21.91 to 22.91 mg kg(-1) in XIM-2 % and from 25.15 to 34.73 mg kg(-1) in XAM-2 %. The 2 % MS application promoted the proliferation of key P-solubilizing bacterial groups, specifically Proteobacteria, Bacteroidota, Arthrobacter and Bacillus in both soils, indicating strong microbial shifts associated with MS decomposition. These shifts in bacterial consortium were associated with increased production of dissolved organic carbon and pH fluctuations, facilitating P solubilization. This, therefore, enhanced grain P uptake in XIM-2 % (169.42 mg kg(-1)) and XAM-2 % (338.82 mg kg(-1)), suggesting that 2 % MS application can effectively promote bacterial functions to improve P transformation and its uptake by wheat grains. These chemical and bacterial improvements produced clear agronomic gains, with the 2 MS% amendments enhancing wheat yield components compared with the control. The ranking of different MS application rates using the Technique for Order of Preference by Similarity to the Ideal Solution (TOPSIS) method (XIM-2 % = 1.00; XAM-2 % = 1.00) reinforced that 2 % MS is the optimal application rate for augmenting the bioavailability of P in these soil systems. These offer an important perspective for the emergence of viable residue management practices to optimize P availability and enhance soil fertility in alkaline agricultural systems.
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