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<p>This study evaluated the contribution of agroecological management of Amazonian Indigenous homegardens to climate change mitigation, through assessment of carbon stocks and soil fertility. Twelve homegardens in the Andirá-Marau Indigenous Land, from young (&gt; 10&#xa0;years) to intermediate (10–30 y) and old (&gt; 30 y) were studied. Semi-structured interviews with residents were used to construct a refined management index with a cumulative factor, quantifying the use of agroecological practices. Soil fertility was assessed via analysis of carbon, phosphorus, calcium, potassium, magnesium, and micronutrient contents. Biomass was estimated using forest inventories and allometric equations. Total carbon stocks (Mg ha⁻<sup>1</sup>) in soil and biomass were compared with those of adjacent primary forest areas. There was no significant difference between the total carbon stock of old homegardens and forests, but there was between younger homegardens (115.7 t ha-1) and forests (281.00 t ha-1). Average soil carbon content (17.88&#xa0;g&#xa0;kg⁻<sup>1</sup>), available phosphorus (25.99&#xa0;mg&#xa0;kg⁻<sup>1</sup>) and sum of bases in homegardens did not differ significantly from those in forest soils. Unusual high values of phosphorus in older homegardens soil, up to 180&#xa0;mg&#xa0;kg<sup>−1</sup>, and near-forest carbon levels at very small household scale are evidence of Indigenous management efficacy. A management index refined with a cumulative weighting factor, combined with estimates of concurrent soil and vegetation carbon, can be a robust tool for assessing land use management in different settings and contexts. The findings recognise Indigenous stewardship and highlight their lands as vital reserves that integrate livelihoods with conservation, while advancing climate justice beyond the UN REDD<sup>+</sup> framework.</p>

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Soil fertility and carbon stocks of indigenous agroforestry homegardens in the lower Amazon region

  • 期刊论文

  • 发表日期：

    2025年12月6日

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  • Sinval Dias Aragao,
  • Sonia Sena Alfaia,
  • Marta Iria da Costa Ayres,
  • Flávia Regina Capelloto Costa

摘要

This study evaluated the contribution of agroecological management of Amazonian Indigenous homegardens to climate change mitigation, through assessment of carbon stocks and soil fertility. Twelve homegardens in the Andirá-Marau Indigenous Land, from young (> 10 years) to intermediate (10–30 y) and old (> 30 y) were studied. Semi-structured interviews with residents were used to construct a refined management index with a cumulative factor, quantifying the use of agroecological practices. Soil fertility was assessed via analysis of carbon, phosphorus, calcium, potassium, magnesium, and micronutrient contents. Biomass was estimated using forest inventories and allometric equations. Total carbon stocks (Mg ha⁻1) in soil and biomass were compared with those of adjacent primary forest areas. There was no significant difference between the total carbon stock of old homegardens and forests, but there was between younger homegardens (115.7 t ha-1) and forests (281.00 t ha-1). Average soil carbon content (17.88 g kg⁻1), available phosphorus (25.99 mg kg⁻1) and sum of bases in homegardens did not differ significantly from those in forest soils. Unusual high values of phosphorus in older homegardens soil, up to 180 mg kg−1, and near-forest carbon levels at very small household scale are evidence of Indigenous management efficacy. A management index refined with a cumulative weighting factor, combined with estimates of concurrent soil and vegetation carbon, can be a robust tool for assessing land use management in different settings and contexts. The findings recognise Indigenous stewardship and highlight their lands as vital reserves that integrate livelihoods with conservation, while advancing climate justice beyond the UN REDD+ framework.