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Evaluating differences in humic substances formation based on the shikimic acid pathway during different materials
Wenshuai Zhang1, Yue Zhao1, Qian Lu2
1College of Life Science, Northeast Agricultural University, Harbin 150030, China.
Bioresource Technology
|October 4, 2022
Summary
Composting lawn and garden waste significantly improves humic substance (HS) formation, driven by the shikimic acid pathway (SAP). This pathway enhances compost quality and microbial communities, offering a foundation for better composting practices.
Area of Science:
- Environmental Science
- Soil Science
- Biochemistry
Background:
- Humic substances (HS) are crucial for soil health and fertility.
- The shikimic acid pathway (SAP) plays a role in the formation of organic compounds.
- Understanding the link between SAP and HS formation during composting is essential for improving compost quality.
Purpose of the Study:
- To investigate the influence of the shikimic acid pathway (SAP) on humic substance (HS) formation during the composting of five different materials.
- To compare the effectiveness of SAP in different compost materials, specifically lawn waste (LW) and garden waste (GW).
- To elucidate the relationship between SAP products, HS fractions, microbial communities, and overall humification.
Main Methods:
- Composting of five different materials, including lawn waste (LW) and garden waste (GW).
- Analysis of SAP products (gallic acid, protocatechuic acid, shikimic acid) and HS fractions (humic acid, degree of polymerization).
- Correlation analysis, network analysis of microbial communities, and structural equation modeling (SEM).
Main Results:
- SAP products decreased significantly in LW and GW compost compared to other materials.
- Humic acid and degree of polymerization increased substantially in LW and GW compost (39.4%-87.9%).
- SAP products strongly correlated with HS fractions, and core bacteria associated with both SAP and HS were identified in LW and GW, with SEM confirming SAP's significant contribution to humification.
Conclusions:
- The shikimic acid pathway (SAP) significantly contributes to humic substance (HS) formation and humification improvement in lawn waste (LW) and garden waste (GW) composting.
- Findings provide a theoretical basis and practical strategies for enhancing compost quality through SAP manipulation.
- This research highlights the importance of specific organic precursors in driving humification processes during composting.
Keywords:
Core bacteriaHumic substance formationMetabolitesOrganic solid waste compostingShikimic acid pathway
