Maize straw increases while its biochar decreases native organic carbon mineralization in a subtropical forest soil

文献类型： 外文期刊

第一作者： Zhou, Jiashu

作者： Zhou, Jiashu;Zhang, Shaobo;Lv, Junyan;Zhang, Haibo;Cai, Yanjiang;Yu, Bing;Li, Yongfu;Zhang, Shaobo;Tang, Caixian;Fang, Yunying;Tavakkoli, Ehsan;Ge, Tida;Luo, Yu;White, Jason C.

作者机构：

关键词： Biochar; C-cycling genes; Priming effect; Soil organic C mineralization; Straw

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：8.2； 五年影响因子：8.6 ）

ISSN： 0048-9697

年卷期： 2024 年 939 卷

页码：

收录情况： SCI

摘要： Organic soil amendments have been widely adopted to enhance soil organic carbon (SOC) stocks in agroforestry ecosystems. However, the contrasting impacts of pyrogenic and fresh organic matter on native SOC mineralization and the underlying mechanisms mediating those processes remain poorly understood. Here, an 80-day experiment was conducted to compare the effects of maize straw and its derived biochar on native SOC mineralization within a Moso bamboo (Phyllostachys edulis) forest soil. The quantity and quality of SOC, the expression of microbial functional genes concerning soil C cycling, and the activity of associated enzymes were determined. Maize straw enhanced while its biochar decreased the emissions of native SOC-derived CO2. The addition of maize straw (cf. control) enhanced the O-alkyl C proportion, activities of beta-glucosidase (BG), cellobiohydrolase (CBH) and dehydrogenase (DH), and abundances of GH48 and cbhI genes, while lowered aromatic C proportion, RubisCO enzyme activity, and cbbL abundance; the application of biochar induced the opposite effects. In all treatments, the cumulative native SOC-derived CO 2 efflux increased with enhanced O -alkyl C proportion, activities of BG, CBH, and DH, and abundances of GH48 and cbh I genes, and with decreases in aromatic C, RubisCO enzyme activity and cbbL gene abundance. The enhanced emissions of native SOC-derived CO 2 by the maize straw were associated with a higher O -alkyl C proportion, activities of BG and CBH, and abundance of GH48 and cbh I genes, as well as a lower aromatic C proportion and cbbL gene abundance, while biochar induced the opposite effects. We concluded that maize straw induced positive priming, while its biochar induced negative priming within a subtropical forest soil, due to the contrasting microbial responses resulted from changes in SOC speciation and compositions. Our findings highlight that biochar application is an effective approach for enhancing soil C stocks in subtropical forests.

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