Long‐Term Organic Fertilization Enhances Particulate Organic Matter Accumulation Through Macroaggregate Formation in the Loess Plateau
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Key Points
This research aims to evaluate the impact of long-term organic fertilization on soil aggregation and soil organic carbon dynamics in low-fertility soils of the Loess Plateau.
Conducted a 33-year maize field experiment with five treatments: no fertilizer, mineral nitrogen-phosphorus fertilizer, and three increasing rates of manure.
Measured proportions of macro- and microaggregates and soil organic carbon content across different treatments.
Quantified carbon conversion efficiency in various soil aggregate fractions.
Higher manure rate treatments (M2 and M3) increased macroaggregates by a significant proportion, leading to a SOC increase of 40%-81% in macroaggregates and 33%-41% in microaggregates.
Particulate organic matter (POM-C) increased by 54%-61%, while mineral-associated organic matter (MAOM-C) increased by 18%-24%.
Carbon conversion efficiency (CCE) was 6.6% in bulk soil and varied among aggregate fractions, underscoring the efficiency of organic inputs.
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