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Priming effects of vermiculite modified rice straw biochar on soil organic carbon: a new perspective of soil bacteria

文献类型： 外文期刊

作者： Wang, Rui 1 ; Hou, Jianhua 3 ; Chen, Litian 1 ; He, Lili 1 ; Na, Liping 1 ; Wang, Yuying 1 ; Lu, Haohao 1 ; Yang, Shengmao 1 ; Liu, Yuxue 1 ;

作者机构： 1.Zhejiang Acad Agr Sci, Inst Environm Resource Soil & Fertilizer, State Key Lab Qual & Safety Agroprod, Hangzhou 310021, Peoples R China

2.Zhejiang Sci Tech Univ, Coll Life Sci & Med, Hangzhou 310018, Zhejiang, Peoples R China

3.Yangzhou Univ, Coll Environm Sci & Engn, Yangzhou 225009, Jiangsu, Peoples R China

4.Zhejiang A&F Univ, Coll Environm & Resources, Coll Carbon Neutral, Hangzhou 311300, Peoples R China

5.Engn Res Ctr Biochar, Hangzhou 310021, Zhejiang, Peoples R China

关键词： Mineral modified biochar; Pyrolysis temperature; Carbon sequestration; Soil microbial community; Soil carbon cycling; C-13 stable isotope

期刊名称：BIOCHAR （ 影响因子：13.5； 五年影响因子：14.1 ）

ISSN： 2524-7972

年卷期： 2025 年 7 卷 1 期

页码：

收录情况： SCI

摘要： Carbon sequestration in farmland is an important pathway to alleviate global warming. Biochar has been considered an excellent material for soil carbon sequestration because of its high stability. How exogenous minerals and pyrolysis temperature regulate the priming effects (PEs) of biochar on soil organic carbon has rarely been studied, relative microbial mechanisms especially the roles of soil bacteria are far from known. Therefore, a series of biochar was prepared by pyrolysis using C-13 isotope labelled rice straw at temperatures of 300, 500, and 700 degrees C with vermiculite modification (VBC300, VBC500, VBC700) and without modification (BC300, BC500, BC700). Incubation experiments were conducted to investigate the PEs of different biochar on the native organic carbon of two types of soil. Results showed that BC300, VBC300, and BC500 induced positive PE, VBC500, BC700, and VBC700 mainly induced negative PE in red soil. All biochar showed negative PE in paddy soil, with PE intensity order of 500 degrees C > 700 degrees C > 300 degrees C. Biochar caused a shift in the bacterial phyla from copiotrophic to oligotrophic bacteria in red soil, whereas it shifted from the coexistence of copiotrophic and oligotrophic to copiotrophic in paddy soil over time. Biochar promoted the interaction among soil bacterial communities indicated by an increase in the edge number of bacterial networks. The correlation coefficient between PE and bacteria networks' edge number was 0.626 and 0.909 in red soil and paddy soil, respectively. Vermiculite modification weakened the promotion effect of biochar on bacterial community interaction and thus was beneficial for carbon sequestration, especially in red soil. VBC700 had excellent carbon sequestration potential in red soil, whereas that was VBC500 in paddy soil.

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