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<p>Regenerative practices such as rotational grazing and silvopasture are increasingly important in organic livestock production systems, where forage productivity and quality depend on soil health and long-term nutrient availability. Biologically active or labile soil organic matter (SOM) is a critical nutrient pool for plants and the soil food web. However, the impact of different regenerative practices on microbial communities and soil health indicators linked to the labile SOM pool remains underexplored in organic systems. A field study was conducted after 11+ years of organic management across four regenerative systems: cover crop–based annual cropping, rotationally grazed pasture, hayed pasture, and silvopasture with restored native prairie served as reference (“soil health target”). Labile SOM indicators included soil organic carbon (SOC), total nitrogen (TN), permanganate oxidizable carbon (POXC), potentially mineralizable nitrogen (PMN), phospholipid fatty acid (PLFA) profiles, and enzyme activities were analyzed. Treatment effects were evaluated using an effect size approach, and microbial community structure was assessed using non-metric multidimensional analysis (NMDS) with Bray–Curtis dissimilarity. Although no statistically significant differences were observed (p &gt; 0.05), effect size analysis revealed meaningful patterns. Hayed pasture approached restored prairie levels in SOC, PMN, and TN. Grazed pasture had the lowest enzyme activities, while the cover crop system tended toward increased POXC. Restored prairie supported distinctive bacterial community structure. Eleven-years of organic management did not lead systems to converge toward restored prairie conditions, though hayed pasture demonstrated favorable trends. Further research is warranted to elucidate mechanisms driving enhanced SOC, PMN, and TN in hayed pasture.</p> Graphical Abstract <p></p>

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Responses of Soil Microbial Communities and Labile C and N to Contrasting Organic Land-Use Systems

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年7月11日

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  • Nasruddeen Al-Awwal,
  • Tunsisa T. Hurisso,
  • Samson Tesfaye

摘要

Regenerative practices such as rotational grazing and silvopasture are increasingly important in organic livestock production systems, where forage productivity and quality depend on soil health and long-term nutrient availability. Biologically active or labile soil organic matter (SOM) is a critical nutrient pool for plants and the soil food web. However, the impact of different regenerative practices on microbial communities and soil health indicators linked to the labile SOM pool remains underexplored in organic systems. A field study was conducted after 11+ years of organic management across four regenerative systems: cover crop–based annual cropping, rotationally grazed pasture, hayed pasture, and silvopasture with restored native prairie served as reference (“soil health target”). Labile SOM indicators included soil organic carbon (SOC), total nitrogen (TN), permanganate oxidizable carbon (POXC), potentially mineralizable nitrogen (PMN), phospholipid fatty acid (PLFA) profiles, and enzyme activities were analyzed. Treatment effects were evaluated using an effect size approach, and microbial community structure was assessed using non-metric multidimensional analysis (NMDS) with Bray–Curtis dissimilarity. Although no statistically significant differences were observed (p > 0.05), effect size analysis revealed meaningful patterns. Hayed pasture approached restored prairie levels in SOC, PMN, and TN. Grazed pasture had the lowest enzyme activities, while the cover crop system tended toward increased POXC. Restored prairie supported distinctive bacterial community structure. Eleven-years of organic management did not lead systems to converge toward restored prairie conditions, though hayed pasture demonstrated favorable trends. Further research is warranted to elucidate mechanisms driving enhanced SOC, PMN, and TN in hayed pasture.

Graphical Abstract