当前位置:首页>农业>山东农业大学李恕艳副教授课题组:解密镁改性生物炭调控堆肥过程中碳转化机制—来自微生物和分子特征的见解

山东农业大学李恕艳副教授课题组:解密镁改性生物炭调控堆肥过程中碳转化机制—来自微生物和分子特征的见解

  • 2026-06-04 04:31:41
山东农业大学李恕艳副教授课题组:解密镁改性生物炭调控堆肥过程中碳转化机制—来自微生物和分子特征的见解

导读

生物炭因其良好的调节性能被广泛研究,可加速堆肥进程、减少碳氮损失。然而,原始生物炭碱性强、孔隙结构有限,应用效果受限。近年来,金属改性生物炭,尤其是镁改性生物炭,因其能通过形成鸟粪石提高养分保留、缓解镁离子高盐度对微生物的毒害,显示出优化有机物降解和促进腐殖化的潜力,但其多因素作用机制尚不明确。因此,本研究通过傅里叶变换红外光谱二维相关光谱(FTIR-2DCOS)、三维荧光光谱-平行因子分析(EEM-PARAFAC)及宏基因组分析等手段,从微生物和分子水平系统揭示镁改性生物炭调控堆肥碳转化的机制,重点探讨其对有机质降解、腐殖质形成、CO₂和CH₄排放的影响。

▲图1 摘要图(来源:ScienceDirect)
1.三维激发-发射基质荧光光谱和平行因子分析 (EEM-PARAFAC)
利用EEM-PARAFAC分析发现,堆肥过程中不稳定蛋白类物质(C2)减少,腐殖酸类物质(C1、C3)增加。镁改性生物炭(MBC)和生物炭(BC)处理显著提高了腐殖化程度,促进了类蛋白物质向类腐殖物质的转化,且DOM主要源于微生物内源活动。
▲图2 (a-c) 通过激发-发射基质光谱和并行因子分析 (EEM-PARAFAC) 鉴定的三种荧光成分,(d) 荧光成分1-3的Fmax强度,FI、FrI、BIX和HIX的荧光指数 (e)(来源:ScienceDirect)
2.傅里叶变换红外光谱和二维相关光谱(FTIR-2DCOS)
利用FTIR-2DCOS分析表明,镁改性生物炭加速了堆肥中不稳定有机物(如蛋白质衍生物、脂肪族组分)的分解与转化,促进了更高氧化和缩合度的腐殖质形成,显著增强了腐殖化程度。
▲图3 MBC堆肥处理过程中腐殖质物质可能的假设形成途径
(来源:ScienceDirect)
3.与堆肥过程中碳循环相关的功能基因
分析了堆肥碳循环相关功能基因。镁改性生物炭处理上调了碳固定基因(如cbbL、acsA)的表达,同时抑制了产甲烷基因(mcrA)的丰度,从而增强CO₂固定能力并减少CH₄排放。此外,还促进了淀粉、纤维素、半纤维素等有机质降解相关基因(如amyA、bglB、nagA)的表达,加速了有机质降解和堆肥稳定化。
▲图4 与碳循环相关的功能基因的相对丰度。(a) Calvin 循环,(b) 还原柠檬酸循环,(c) 还原乙酰辅酶 A 途径,(d) 还原甘氨酸途径和 (e) CH4代谢途径(来源:ScienceDirect)
参考文献
[1] Xuhan Gu, Jingchen Song, Hui, Li, Yixun Shi, Jiahui Wang, Jijin Li, Shuyan Li*. Deciphering the mechanism of carbon transformation during composting regulated with Mg-modified biochar: Insights from microbial and molecular characterization, 2026, Journal of Environmental Chemical Engineering, 2026, 14(2): 122025.
[2] Xuhan Gu, Hui, Li, Yixun Shi, Jijin Li, Shuyan Li*. Regulating bacterial dynamics by Mg-modified biochar addition to mitigate gaseous emissions during pig manure composting, Journal of Cleaner Production, 2024, 465: 142839.
[3] Xuhan Gu, Hui, Li, Yixun, Shi, Cun Sun, Jijin Li, Shuyan Li*. Magnesium modified biochar facilitates favorable nitrogen conversion to mitigate ammonia and nitrous oxide emissions during pig manure composting, Chemical Engineering Journal, 2025, 504:159073.
[4] Yixun Shi, Xuhan Gu, Jingchen Song, Hui Li, Cun Sun, Jiahui Wang, Jijin Li, Wen Liu, Guoxiang Bu, Hongbin Wang, Shuyan Li*. Odor emissions and humification during composting of pig manure and cornstalks: Role of mixing proportions, Journal of Environmental Chemical Engineering, 2025, 13: 117586.
[5] Minghan Li, Shuyan Li*, Qingyu Meng, Shigeng Chen, Jianxin Wang, Xinsong Guo, Fangjun Ding*, Lianhui Shi*. Feedstock optimization with rice husk chicken manure and mature compost during chicken manure composting: Quality and gaseous emissions, Bioresource Technology, 2023, 387: 129694.

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  1. CONNECT:[ UseTime:0.000990s ] mysql:host=127.0.0.1;port=3306;dbname=h_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001039s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000623s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000597s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001426s ]
  6. SELECT * FROM `set` [ RunTime:0.000559s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001474s ]
  8. SELECT * FROM `article` WHERE `id` = 515843 LIMIT 1 [ RunTime:0.006027s ]
  9. UPDATE `article` SET `lasttime` = 1780762479 WHERE `id` = 515843 [ RunTime:0.001962s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000698s ]
  11. SELECT * FROM `article` WHERE `id` < 515843 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.003090s ]
  12. SELECT * FROM `article` WHERE `id` > 515843 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000428s ]
  13. SELECT * FROM `article` WHERE `id` < 515843 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003277s ]
  14. SELECT * FROM `article` WHERE `id` < 515843 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001296s ]
  15. SELECT * FROM `article` WHERE `id` < 515843 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000929s ]
0.173589s