秸秆生物炭对微生物来源碳的影响：一项全球元分析。
Effects of straw biochar on microbial-derived carbon: A global meta-analysis.
机构信息
Collaborative Innovation Center for Modern Crop Production Co-Sponsored by Province and Ministry, College of Agriculture, Nanjing Agricultural University, Nanjing, 210095, China.
Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China.
出版信息
J Environ Manage. 2024 Sep;368:122233. doi: 10.1016/j.jenvman.2024.122233. Epub 2024 Aug 20.
Pyrolyzing biomass (e.g., crop straw) to produce biochar is a sustainable strategy in agricultural farmlands. Straw-derived biochar could increase soil organic carbon (SOC) and microbial-derived carbon (C) compared to no addition, while it is imperative to understand the effects of straw-derived biochar compared to its feedstock (e.g., straw). We retrieved 321 and 387 observations to investigate the effects of straw-derived biochar on microbial-derived C (e.g., microbial biomass C (MBC) and microbial necromass C (MNC)) taking no addition and straw as control, respectively. Notably, straw-derived biochar significantly increased dissolved organic C (DOC) by 24.9% and provided available substrates for microbial utilization, thus improving MBC by 16.7% and MNC by 19.7% compared to no addition. Nevertheless, compared to its feedstock (crop straw), straw-derived biochar significantly decreased MBC by 26.1% and MNC by 18.0% attributed to lower DOC, supported by a positive correlation between MBC and DOC (R = 0.53). A negative correlation between changes in MBC and SOC indicated the adverse of microbial activity for C accrual under conversion from straw to biochar. Moreover, soil layer, experiment duration, and initial C/N ratio are the crucial factors affecting MBC under the conversion from straw to biochar. Specifically, with significant variations among subgroups, when compared to straw addition, straw-derived biochar had lower reduction in MBC observed on 0-5 cm layers, mean annual precipitation ≥550 mm, mean annual temperature ≥10 °C, clay loam soil, experiment duration≥1 yr, initial SOC≥14 g kg, pH≥8, and bulk density ≥1.28 g cm. Straw-derived biochar even increased MBC by 32.8% in an anaerobic environment, associated with biochar produced under limited oxygen and anaerobic microorganisms dominating the microbial community. This study concludes that the conversion from crop straw to biochar increases SOC but constrains microbial-derived C, which may disturb the microbial-mediated C-cycling process.
将生物质（例如农作物秸秆）热解为生物炭是农业领域的一种可持续策略。与不添加相比，秸秆衍生生物炭可以增加土壤有机碳（SOC）和微生物衍生碳（C），但了解秸秆衍生生物炭与秸秆等原料相比的效果至关重要。我们检索到 321 和 387 个观测值，分别以不添加和秸秆为对照，研究秸秆衍生生物炭对微生物衍生 C（例如微生物生物量 C（MBC）和微生物残体 C（MNC））的影响。值得注意的是，与不添加相比，秸秆衍生生物炭可将溶解有机碳（DOC）提高 24.9%，并为微生物利用提供可用底物，从而使 MBC 提高 16.7%，MNC 提高 19.7%。然而，与原料（农作物秸秆）相比，由于 DOC 较低，秸秆衍生生物炭使 MBC 和 MNC 分别降低了 26.1%和 18.0%。MBC 与 DOC 之间呈正相关（R=0.53），支持了这一结论。MBC 和 SOC 的变化呈负相关，表明在从秸秆到生物炭的转化过程中，微生物活性对 C 积累不利。此外，土壤层、实验持续时间和初始 C/N 比是影响秸秆转化为生物炭过程中 MBC 的关键因素。具体来说，与秸秆添加相比，在子组之间存在显著差异的情况下，在 0-5 cm 土层、年平均降水量≥550 mm、年平均温度≥10°C、粘壤土、实验持续时间≥1 年、初始 SOC≥14 g kg、pH≥8 和容重≥1.28 g cm 时，观察到秸秆衍生生物炭对 MBC 的降低幅度较小。甚至在厌氧环境中，秸秆衍生生物炭也会增加 32.8%的 MBC，这与在有限氧气下生产的生物炭以及在微生物群落中占主导地位的厌氧微生物有关。本研究得出结论，将农作物秸秆转化为生物炭会增加 SOC，但会限制微生物衍生的 C，这可能会干扰微生物介导的 C 循环过程。
Zotero 插件