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Nitrogen input level modulates straw-derived organic carbon physical fractions accumulation by stimulating specific fungal groups during decomposition

文献类型： 外文期刊

作者： Duan, Yan 1 ; Chen, Lin 1 ; Li, Yumei 3 ; Li, Jiangye 4 ; Zhang, Congzhi 1 ; Ma, Donghao 1 ; Zhou, Guixiang 1 ; Zhang, Jiabao 1 ;

作者机构： 1.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Fengqiu Expt Stn Natl Ecosyst Res Network China, Nanjing 210008, Peoples R China

2.Chinese Acad Sci, Hefei Inst Phys Sci, Ctr Ion Beam Bioengn Green Agr, Hefei 230031, Anhui, Peoples R China

3.Heilongjiang Acad Agr Sci, Inst Soil Fertilizer & Environm Resources, Harbin 150086, Peoples R China

4.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Nanjing 210014, Peoples R China

关键词： Straw decomposition; Nutrient inputs; Soil organic carbon; Microbial community; Chaetomium globosum

期刊名称：SOIL & TILLAGE RESEARCH （ 影响因子：7.366； 五年影响因子：7.829 ）

ISSN： 0167-1987

年卷期： 2023 年 225 卷

页码：

收录情况： SCI

摘要： Microbial-driven straw-derived soil organic carbon (SOC) sequestration plays pivotal role in promoting soil productivity and achieving C neutrality, while nitrogen (N) and phosphorus (P) input levels are the impetus of this process. However, our understanding of the microbial mechanism underpinning the straw-derived SOC fractions accumulation within aggregates under contrasting N and P application rates is rudimentary. Here, a 90 -day incubation experiment was conducted to observe the dynamics of straw-derived SOC fractions accumulation within aggregates by adding C3 straw (natural 13C-labeled substrate) to a Mollisol (in which C3 plants had never been grown). Treatments included straw combinations of half N and regular P (N1/2 +P + SR), regular N and half P (N + P1/2 +SR) and regular N and P (N + P + SR). Regular N input accelerated the succession of the microbial community from bacteria-dominated to fungi-dominated and increased the contents of straw-derived particulate OC (POC) at 10 days and mineral-associated OC (MOC) at 30 days within aggregates. Differential abundance analysis and slopes of linear regression models showed that the fungal community, especially the core enriched taxon of Chaetomiaceae, was strongly positively correlated with straw-derived MOC after N input. Random forest models strengthened the view that N input rate and Chaetomiaceae richness may directly mediate straw-derived POC and MOC accumulation process, respectively, during incubation. To verify our conjecture, another 60-day incubation experiment was carried out to elucidate the effects of Chaetomium globosum inoculation and N application on SOC turnover after straw addition. Chaetomium globosum inoculation with regular N input pro-moted straw decomposition and SOC sequestration than other treatments, but no difference was observed in soil respiratory quotient compared with control. The slopes of linear regression model show the more significant and positive correlations between SOC content and Chaetomiaceae richness in the present study than data from previous references, impling the important role of Chaetomiaceae in SOC sequestration in Mollisols. Our work provides new ecophysiological angles for understanding the effect of Chaetomiaceae richness on the accrual of SOC in response to varying N levels in agroecosystems on the Northeast China Plain.

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