Soils in warmer and less developed countries have less micronutrients globally

作者：Eduardo Moreno‐Jiménez, Fernando T. Maestre, Maren Flagmeier, Emilio Guirado, Miguel Berdugo, Felipe Bastida, Marina Dacal, Paloma Díaz‐Martínez, Raúl Ochoa‐Hueso, César Plaza, Matthias C. Rillig, Thomas W. Crowther, Manuel Delgado‐Baquerizo · 发表于：Global Change Biology · 年份：2022 · DOI：10.1111/gcb.16478 · 被引用次数：37 · 研究领域：Soil Carbon and Nitrogen Dynamics、Pasture and Agricultural Systems、Plant Micronutrient Interactions and Effects

Soil micronutrients are capital for the delivery of ecosystem functioning and food provision worldwide. Yet, despite their importance, the global biogeography and ecological drivers of soil micronutrients remain virtually unknown, limiting our capacity to anticipate abrupt unexpected changes in soil micronutrients in the face of climate change. Here, we analyzed >1300 topsoil samples to examine the global distribution of six metallic micronutrients (Cu, Fe, Mn, Zn, Co and Ni) across all continents, climates and vegetation types. We found that warmer arid and tropical ecosystems, present in the least developed countries, sustain the lowest contents of multiple soil micronutrients. We further provide evidence that temperature increases may potentially result in abrupt and simultaneous reductions in the content of multiple soil micronutrients when a temperature threshold of 12-14°C is crossed, which may be occurring on 3% of the planet over the next century. Altogether, our findings provide fundamental understanding of the global distribution of soil micronutrients, with direct implications for the maintenance of ecosystem functioning, rangeland management and food production in the warmest and poorest regions of the planet.