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Film-straw dual mulching improves soil fertility and maize yield in dryland farming by increasing straw-degrading bacterial abundance and their positive cooperation

文献类型： 外文期刊

作者： Yang, Fengke 1 ; He, Baolin 1 ; Dong, Bo 2 ; Zhang, Guoping 1 ;

作者机构： 1.Gansu Acad Agr Sci, Dryland Farming Inst, 1 Acad Village, Lanzhou 730070, Gansu, Peoples R China

2.Key Lab Efficient Utilizat Water Dry Farming Gansu, Lanzhou 730070, Gansu, Peoples R China

3.Minist Agr & Rural Affairs, Key Lab Low carbon Green Agr Northwestern China, Lanzhou 730070, Peoples R China

4.Joint Key Lab Minist Agr & Rural Affairs Gansu Pro, Yield Increment & Rainwater Efficient Utilizat Rai, Lanzhou 730070, Gansu, Peoples R China

关键词： Film-straw dual mulching; Straw-degrading bacteria; Positive cooperation; Soil fertility; Maize yield

期刊名称：AGRICULTURE ECOSYSTEMS & ENVIRONMENT （ 影响因子：6.6； 五年影响因子：6.7 ）

ISSN： 0167-8809

年卷期： 2024 年 367 卷

页码：

收录情况： SCI

摘要： Film-straw dual mulching (FMSS) has been utilized successfully for corn production in dryland farming. However, the mechanisms by which FMSS improves soil fertility and maize yields remain obscure. Therefore, a threeyear field trial with four treatments, including conventional tillage (blank, BL), FM with standard fertilization (FMSF), and with straw incorporation (FMSS), was conducted between 2018 and 2020. The results demonstrated that FMSS significantly increased the concentrations of soil organic carbon (SOC, 17.48%) and total and available nitrogen and phosphorus (TN, 34.48%; TP, 16.90%; AN, 23.34% and AP, 40.95%) in the 0-40 cm soil profile, resulting in a 31.0% increase in maize yield. FMSS had no significant effect on soil bacterial diversity; however, it selectively increased the relative abundances of Firmicutes, Gemmatimonadetes, and Acidobacteria but decreased those of Proteobacteria, Actinobacteria, Bacteroidetes, and Nitrospirae, and dynamically regulated bacterial life strategies (mainly from k-strategies to r-strategies), thereby forming an efficient straw-degrading functional community. These three straw-degrading bacteria demonstrated a cooperative relationship, and increased labile and recalcitrant straw carbon (C) and nitrogen (N) decomposition rate, nutrient release, and soil fertility. FMSS improved the straw-degrading bacteria abundance, regulated their life strategies, promoted positive cooperation that increases straw decomposition, and increased SOC, TN, TP, AN, and AP, thereby significantly improving soil fertility and maize yield. Therefore, FMSS is an efficient management practice that can replace FM and increase maize yields in dryland farming.

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