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<p>A study was conducted in Coffee Agroforestry Systems (CAS) consisting of plantations of <i>Coffea arabica</i> and <i>Coffea canephora</i> under the shade of native and silver oak trees located in Evergreen and Moist deciduous vegetations in the Western ghats, India. The present study investigated the impact of shade tree identity on soil physico-chemical properties, aggregation, aggregate associated carbon, humus composition and soil organic matter stocks. Soil (0–20 cm) and leaf litter samples were collected from coffee plantations present under shade of native and silver oak trees. Collected soil samples were analyzed for soil organic carbon (SOC), soil aggregation, aggregate associated carbon, humic and fulvic acids in soil aggregates across different CAS. Our results indicated that macroaggregates (63.91–to 67.89% in Evergreen; 61.33–66.08% in Moist deciduous) and the mean weight diameter were higher under native trees (0.69–0.71 mm) than silver oak (0.66–0.68 mm), indicating enhanced aggregate stability. Litter from native trees was higher in C, N, phenols and lignin, whereas silver oak litter had higher cellulose content. Humic acid content was consistently higher than fulvic acid in aggregates, with lower E<sub>4</sub>/E<sub>6</sub> ratio under native trees, suggesting more stable and polymerized organic matter. Overall, irrespective of vegetation types, native shade trees enhanced soil fertility, promoted macroaggregate formation and stabilized SOC as compared to silver oak. These findings emphasize the role of native tree diversity in long-term carbon sequestration and soil quality in coffee agroforestry systems with implications for sustainable management and climate change mitigation.</p>

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Impact of shade trees on soil aggregate stability and carbon sequestration in coffee agroforestry systems of the Western Ghats, India

  • 期刊论文

  • 发表日期：

    2026年3月5日

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  • Nandita Sinha,
  • Mavinakoppa S. Nagaraja,
  • Sonali Paul Mazumdar,
  • S. Raghavendra,
  • Ganapathi Guddekoppa,
  • B. V. Champa,
  • Deepthi Dechamma,
  • Nurnabi Meherul Alam,
  • Sudarshan Varma

摘要

A study was conducted in Coffee Agroforestry Systems (CAS) consisting of plantations of Coffea arabica and Coffea canephora under the shade of native and silver oak trees located in Evergreen and Moist deciduous vegetations in the Western ghats, India. The present study investigated the impact of shade tree identity on soil physico-chemical properties, aggregation, aggregate associated carbon, humus composition and soil organic matter stocks. Soil (0–20 cm) and leaf litter samples were collected from coffee plantations present under shade of native and silver oak trees. Collected soil samples were analyzed for soil organic carbon (SOC), soil aggregation, aggregate associated carbon, humic and fulvic acids in soil aggregates across different CAS. Our results indicated that macroaggregates (63.91–to 67.89% in Evergreen; 61.33–66.08% in Moist deciduous) and the mean weight diameter were higher under native trees (0.69–0.71 mm) than silver oak (0.66–0.68 mm), indicating enhanced aggregate stability. Litter from native trees was higher in C, N, phenols and lignin, whereas silver oak litter had higher cellulose content. Humic acid content was consistently higher than fulvic acid in aggregates, with lower E4/E6 ratio under native trees, suggesting more stable and polymerized organic matter. Overall, irrespective of vegetation types, native shade trees enhanced soil fertility, promoted macroaggregate formation and stabilized SOC as compared to silver oak. These findings emphasize the role of native tree diversity in long-term carbon sequestration and soil quality in coffee agroforestry systems with implications for sustainable management and climate change mitigation.