Abstract
Amazonian dark earths (ADE) are anthropogenic soils mostly created between 500 and 2500 years ago by pre-Columbian populations. ADE are currently used by local people for different agricultural and agroforestry systems. Because of their high fertility they may play an important role in the conservation of non-native agrobiodiversity. This study aimed to investigate the variation in richness and abundance of exotic and native species in homegardens along the ADE-background soil continuum. We conducted floristic inventories in 70 homegardens located in 7 riverside communities along the lower and middle Madeira River, Central Amazonia. Each species sampled was classified according to its origin: native Amazonian, American (from outside Amazonia) and non-American, and each individual was classified according to its form of establishment: cultivated or spontaneous. The floristic diversity was significantly related to soil fertility, texture and homegarden size. We found a positive relationship between soil fertility and richness of species and landraces. Homegardens on more fertile soils tended to have a higher richness and abundance of cultivated non-American species, as well as a higher richness and abundance of spontaneously established American species. Homegardens at the fertile end of the fertility gradient provided conditions for the establishment and growth of many species, especially exotic species, that are generally more nutrient-demanding than Amazonian species. Our results show that homegarden agroecosystems on ADE favour experimentation with the introduction of a wide range of species from various regions of the globe.
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Acknowledgements
We are grateful to all the people in the communities of Água Azul, Terra Preta do Atininga, Puruzinho, Vila Espírito Santo, Lago do Piauí, São Félix and Vila Gomes who participated in this research and shared their knowledge and experiences. We thank the Institute for Sustainable Agriculture and Forestry Development of Amazonas (IDAM), the National Institute of Amazonian Research and the Post-Graduate Program in Botany for logistic support. We thank the technicians at the Thematic Laboratory of Soils and Plants for performing the soil analyses. NBS received a Masters’ scholarship from the Coordination for the Improvement of Higher Education Personnel (CAPES). ABJ received PhD scholarships and funding for fieldwork from the Interdisciplinary Research and Education Fund of Wageningen University (INREF), via the Terra Preta Program, and from the Netherlands Organization for International Cooperation in Higher Education (NUFFIC). Compliance with ethical standards can be found in the Supplementary Material.
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de Souza, N.B., Junqueira, A.B., Struik, P.C. et al. The role of fertile anthropogenic soils in the conservation of native and exotic agrobiodiversity in Amazonian homegardens. Agroforest Syst 93, 471–482 (2019). https://doi.org/10.1007/s10457-017-0137-y
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DOI: https://doi.org/10.1007/s10457-017-0137-y