Abstract
In Los Tuxtlas, Mexico, the local Popoluca people maintain the traditional management of their maize agroecosystems. However, it is not known whether the loss of agrodiversity over recent decades has affected mycorrhizal populations, nutrient availability, and crop productivity. This study utilized linear mixed effect models to analyze the relationship between agrodiversity (three, six, and greater than or equal to eight cultivated species) and (a) arbuscular mycorrhizal fungi (AMF) inoculum potential, measured as the most probable number (MPN) of propagules and colonization level, (b) nutrient availability, and (c) aboveground maize productivity. We also investigated the relationship between soil nutrient content and inoculum potential. Soil samples were taken before planting, and during flowering, in the 2009 maize cycle. We found that AMF colonization level of maize roots and P availability increased with planted species richness, but that this effect only occurred at the flowering sampling date. Plots with a higher MPN of propagules presented increased C and NO −3 contents and lower C/N ratio than those with lower MPN of propagules, regardless of agrodiversity. Soils that produced the highest maize root colonization level also featured high P availability and N content. We conclude that decreased agrodiversity in these traditional systems does not significantly affect the soil MPN of propagules, but may have a negative impact on the ability of the mycorrhizal community to colonize maize roots, as well as reducing the availability of P, which is often the most limiting nutrient in tropical soils.
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Notes
milpas are the slash and burn polyculture system most common in Mesoamerica, where the main products are maize, squashes, and beans, among many others including perennials; this itinerant system coexisted with tropical forests by incorporating very long fallow periods (Gomez-Pompa 1987). Currently, the term milpa is also applied for more simplified and intensified versions of the original traditional slash and burn system.
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Acknowledgments
We are grateful to Dora Trejo, Vinicio Sosa Fernández, and Jose Luis Blanco for invaluable advice during the development of this research; to the farmers and local authorities of Ocotal Chico and Mazumiapan for actively participating and facilitating the project; to Isis de la Rosa for figure edition; and to two anonymous reviewers whose comments greatly improved the manuscript. This research was funded by the FOMIX 94427 project (CONACYT-Veracruz Government) as part of the BioPop project.
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Negrete-Yankelevich, S., Maldonado-Mendoza, I.E., Lázaro-Castellanos, J.O. et al. Arbuscular mycorrhizal root colonization and soil P availability are positively related to agrodiversity in Mexican maize polycultures. Biol Fertil Soils 49, 201–212 (2013). https://doi.org/10.1007/s00374-012-0710-5
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DOI: https://doi.org/10.1007/s00374-012-0710-5