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Aridity and reduced soil micronutrient availability in global drylands


Drylands cover more than 40% of the terrestrial surface, and their global extent and socioecological importance will increase in the future due to the forecasted increases in aridity driven by climate change. Despite the essential role of metallic micronutrients in life chemistry and ecosystem functioning, it is virtually unknown how their bioavailability changes along aridity gradients at the global scale. Here, we analysed soil total and available copper, iron, manganese and zinc in 143 drylands from all continents, except Antarctica, covering a broad range of aridity and soil conditions. We found that total and available micronutrient concentrations in dryland soils were low compared with averages commonly found in soils of natural and agricultural ecosystems globally. Aridity negatively affected the availability of all micronutrients evaluated, mainly indirectly by increasing soil pH and decreasing soil organic matter. Remarkably, the available Fe:Zn ratio decreased exponentially as the aridity increased, pointing to stoichiometric alterations. Our findings suggest that increased aridity conditions due to climate change will limit the availability of essential micronutrients for organisms, particularly iron and zinc, which together with other adverse effects (for example, reduced water availability) may pose serious threats to key ecological processes and services, such as food production, in drylands worldwide.

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Fig. 1: Box plots of total and available (DTPA-extractable) iron, zinc, copper and manganese concentrations in soils from global drylands.
Fig. 2: Changes in the Fe:Zn ratio as a function of aridity.
Fig. 3: Effects of aridity, clay percentage, pH and organic carbon on total and available iron and zinc.
Fig. 4: Effects of aridity, clay percentage, pH and organic carbon on total and available copper and manganese.
Fig. 5: Direct, indirect and total sum of effects provided by the CPA.

Data availability

The data that support the findings of this study and the R codes are available in Figshare ( The R codes for the statistical models are provided in the Supplementary Information.


  1. 1.

    Prăvălie, R. Drylands extent and environmental issues. A global approach. Earth Sci. Rev. 161, 259–278 (2016).

    Article  Google Scholar 

  2. 2.

    Schimel, D. S. Drylands in the Earth system. Science 327, 418–419 (2010).

    CAS  Article  Google Scholar 

  3. 3.

    Fu, Q. & Feng, S. Responses of terrestrial aridity to global warming. J. Geophys. Res. Atmos. 119, 7863–7875 (2014).

    Article  Google Scholar 

  4. 4.

    Huang, J., Yu, H., Guan, X., Wang, G. & Guo, R. Accelerated dryland expansion under climate change. Nat. Clim. Change 6, 166–171 (2016).

    Article  Google Scholar 

  5. 5.

    Maestre, F. T. et al. Structure and functioning of dryland ecosystems in a changing world. Annu. Rev. Ecol. Evol. Syst. 47, 215–237 (2016).

    Article  Google Scholar 

  6. 6.

    Yuan, Z. et al. Experimental and observational studies find contrasting responses of soil nutrients to climate change. eLife 6, e23255 (2017).

    Article  Google Scholar 

  7. 7.

    Luo, W. et al. Thresholds in decoupled soil–plant elements under changing climatic conditions. Plant Soil 409, 159–173 (2016).

    CAS  Article  Google Scholar 

  8. 8.

    Marschner, B. & Kalbitz, K. Controls of bioavailability and biodegradability of dissolved organic matter in soils. Geoderma 113, 211–235 (2003).

    CAS  Article  Google Scholar 

  9. 9.

    Bowker, M. A., Belnap, J., Davidson, D. W. & Goldstein, H. Correlates of biological soil crust abundance across a continuum of spatial scales: support for a hierarchical conceptual model. J. Appl. Ecol. 43, 152–163 (2006).

    Article  Google Scholar 

  10. 10.

    Broadley, M., Brown, P., Cakmak, I., Rengel, Z. & Zhao, F. in Marschner’s Mineral Nutrition of Higher Plants 191–248 (Academic Press, 2012).

  11. 11.

    Welch, R. M. & Shuman, L. Micronutrient nutrition of plants. CRC. Crit. Rev. Plant Sci. 14, 49–82 (1995).

    CAS  Article  Google Scholar 

  12. 12.

    Sherman, A. R. Zinc, copper, and iron nutriture and immunity. J. Nutr. 122, 604–609 (1992).

    CAS  Article  Google Scholar 

  13. 13.

    Thompson, B. & Amoroso, L. Combating Micronutrient Deficiencies: Food-based Approaches (CABI, 2010).

  14. 14.

    Spears, J. W. Micronutrients and immune function in cattle. Proc. Nutr. Soc. 59, 587–594 (2000).

    CAS  Article  Google Scholar 

  15. 15.

    Jones, G. D. et al. Selenium deficiency risk predicted to increase under future climate change. Proc. Natl Acad. Sci. USA 114, 2484–2853 (2017).

    Google Scholar 

  16. 16.

    McBride, M. B. in Advances in Soil Science (ed. Stewart, B. A.) 1–56 (Springer New York, 1989).

  17. 17.

    Kabata-Pendias, A. Soil–plant transfer of trace elements—an environmental issue. Geoderma 122, 143–149 (2004).

    CAS  Article  Google Scholar 

  18. 18.

    Plaza, C. et al. Soil resources and element stocks in drylands to face global issues. Sci. Rep. 8, 13788 (2018).

    Article  Google Scholar 

  19. 19.

    Ptacnik, R. et al. Applications of ecological stoichiometry for sustainable acquisition of ecosystem services. Oikos 109, 52–62 (2005).

    Article  Google Scholar 

  20. 20.

    Sardans, J., Rivas-Ubach, A. & Peñuelas, J. The C:N:P stoichiometry of organisms and ecosystems in a changing world: a review and perspectives. Perspect. Plant Ecol. Evol. Syst. 14, 33–47 (2012).

    Article  Google Scholar 

  21. 21.

    Robinson, L. W., Ericksen, P. J., Chesterman, S. & Worden, J. S. Sustainable intensification in drylands: what resilience and vulnerability can tell us. Agric. Syst. 135, 133–140 (2015).

    Article  Google Scholar 

  22. 22.

    Adeel, Z., Safriel, U., Niemeijer, D. & White, R. Ecosystems and Human Well-being: Desertification Synthesis (World Resources Institute, 2005).

  23. 23.

    Reynolds, J. F. et al. Global desertification: building a science for dryland development. Science 316, 847–851 (2007).

    CAS  Article  Google Scholar 

  24. 24.

    Delgado-Baquerizo, M. et al. Decoupling of soil nutrient cycles as a function of aridity in global drylands. Nature 502, 672–676 (2013).

    CAS  Article  Google Scholar 

  25. 25.

    Kabata-Pendias, A. & Pendias, H. Trace Elements in Soils and Plants (CRC Press, 2001).

  26. 26.

    Lindsay, W. L. Chemical Equilibria in Soils (John Wiley and Sons, 1979).

  27. 27.

    Garnett, T. et al. Sustainable intensification in agriculture: premises and policies. Science 341, 33–34 (2013).

    CAS  Article  Google Scholar 

  28. 28.

    Gupta, U. C., Wu, K. & Liang, S. Micronutrients in soils, crops, and livestock. Earth Sci. Front. 15, 110–125 (2008).

    CAS  Article  Google Scholar 

  29. 29.

    Graham, T. W. Trace element deficiencies in cattle. Vet. Clin. North Am. Food Anim. Pract. 7, 153–215 (1991).

    CAS  Article  Google Scholar 

  30. 30.

    Luo, W. et al. A threshold reveals decoupled relationship of sulfur with carbon and nitrogen in soils across arid and semi-arid grasslands in northern China. Biogeochemistry 127, 141–153 (2016).

    CAS  Article  Google Scholar 

  31. 31.

    Sardans, J. & Peñuelas, J. Potassium: a neglected nutrient in global change. Glob. Ecol. Biogeogr. 24, 261–275 (2015).

    Article  Google Scholar 

  32. 32.

    Kobayashi, T. & Nishizawa, N. K. Iron uptake, translocation, and regulation in higher plants. Annu. Rev. Plant Biol. 63, 131–152 (2012).

    CAS  Article  Google Scholar 

  33. 33.

    Marschner, H., Römheld, V. & Kissel, M. Different strategies in higher plants in mobilization and uptake of iron. J. Plant Nutr. 9, 695–713 (1986).

    CAS  Article  Google Scholar 

  34. 34.

    Kim, S. A. & Guerinot, M. L. Mining iron: iron uptake and transport in plants. FEBS Lett. 581, 2273–2280 (2007).

    CAS  Article  Google Scholar 

  35. 35.

    Ulrich, W. et al. Climate and soil attributes determine plant species turnover in global drylands. J. Biogeogr. 41, 2307–2319 (2014).

    Article  Google Scholar 

  36. 36.

    Shipley, B. Confirmatory path analysis in a generalized multilevel context. Ecology 90, 363–368 (2009).

    Article  Google Scholar 

  37. 37.

    Dregne, H. E. Soils of Arid Regions Vol. 6 (Elsevier, 1976).

  38. 38.

    Kleber, M. et al. Chapter one—mineral–organic associations: formation, properties, and relevance in soil environments. Adv. Agron. 130, 1–140 (2015).

    Article  Google Scholar 

  39. 39.

    Safriel, U. & Adeel, Z. in Ecosystems and Human Well-being: Current State and Trends (eds Hassan, R., Scholes, R. & Ash, N.) 625–658 (Island Press, 2005).

  40. 40.

    Brady, N. C. & Weil, R. R. The Nature and Properties of Soils (Pearson Education, 2016).

  41. 41.

    Loveland, P. & Webb, J. Is there a critical level of organic matter in the agricultural soils of temperate regions: a review. Soil Tillage Res. 70, 1–18 (2003).

    Article  Google Scholar 

  42. 42.

    Carter, M. R. & Stewart, B. A. Structure and Organic Matter Storage in Agricultural Soils (CRC Press, 1995).

  43. 43.

    Katyal, J. C. & Sharma, B. D. DTPA-extractable and total Zn, Cu, Mn, and Fe in Indian soils and their association with some soil properties. Geoderma 49, 165–179 (1991).

    CAS  Article  Google Scholar 

  44. 44.

    White, J. G. & Zasoski, R. J. Mapping soil micronutrients. Field Crops Res. 60, 11–26 (1999).

    Article  Google Scholar 

  45. 45.

    Habiby, H., Afyuni, M., Khoshgoftarmanesh, A. H. & Schulin, R. Effect of preceding crops and their residues on availability of zinc in a calcareous Zn-deficient soil. Biol. Fertil. Soils 50, 1061–1067 (2014).

    CAS  Article  Google Scholar 

  46. 46.

    Jansen, B., Nierop, K. G. J. & Verstraten, J. M. Mechanisms controlling the mobility of dissolved organic matter, aluminium and iron in podzol B horizons. Eur. J. Soil Sci. 56, 537–550 (2005).

    CAS  Article  Google Scholar 

  47. 47.

    Güngör, E. B. Ö. & Bekbölet, M. Zinc release by humic and fulvic acid as influenced by pH, complexation and DOC sorption. Geoderma 159, 131–138 (2010).

  48. 48.

    He, Z. L., Yang, X. E. & Stoffella, P. J. Trace elements in agroecosystems and impacts on the environment. J. Trace Elem. Med. Biol. 19, 125–140 (2005).

    CAS  Article  Google Scholar 

  49. 49.

    Sauvé, S., Hendershot, W. & Allen, H. E. Solid-solution partitioning of metals in contaminated soils: dependence on pH, total metal burden, and organic matter. Environ. Sci. Technol. 34, 1125–1131 (2000).

    Article  Google Scholar 

  50. 50.

    Bradl, H. B. Adsorption of heavy metal ions on soils and soils constituents. J. Colloid Interface Sci. 277, 1–18 (2004).

    CAS  Article  Google Scholar 

  51. 51.

    Sims, J. T. Soil pH effects on the distribution and plant availability of manganese, copper, and zinc. Soil Sci. Soc. Am. J. 50, 367–373 (1986).

    CAS  Article  Google Scholar 

  52. 52.

    Kämpf, N. & Schwertmann, U. Goethite and hematite in a climosequence in southern Brazil and their application in classification of kaolinitic soils. Geoderma 29, 27–39 (1983).

    Article  Google Scholar 

  53. 53.

    Voegelin, A., Pfister, S., Scheinost, A. C., Marcus, M. A. & Kretzschmar, R. Changes in zinc speciation in field soil after contamination with zinc oxide. Environ. Sci. Technol. 39, 6616–6623 (2005).

    CAS  Article  Google Scholar 

  54. 54.

    Slessarev, E. W. et al. Water balance creates a threshold in soil pH at the global scale. Nature 540, 567–569 (2016).

    CAS  Article  Google Scholar 

  55. 55.

    Maestre, F. T., Salguero-Gómez, R. & Quero, J. L. It is getting hotter in here: determining and projecting the impacts of global environmental change on drylands. Philos. Trans. R. Soc. Lond. B. 367, 3062–3075 (2012).

    Article  Google Scholar 

  56. 56.

    Palmgren, M. G. et al. Zinc biofortification of cereals: problems and solutions. Trends Plant Sci. 13, 464–473 (2008).

    CAS  Article  Google Scholar 

  57. 57.

    White, P. J. & Broadley, M. R. Biofortifying crops with essential mineral elements. Trends Plant Sci. 10, 586–593 (2005).

    Article  Google Scholar 

  58. 58.

    Zhao, F. J. et al. Variation in mineral micronutrient concentrations in grain of wheat lines of diverse origin. J. Cereal Sci. 49, 290–295 (2009).

    CAS  Article  Google Scholar 

  59. 59.

    Gerland, P. et al. World population stabilization unlikely this century. Science 346, 234–237 (2014).

    CAS  Article  Google Scholar 

  60. 60.

    Smith, M. R. & Myers, S. S. Impact of anthropogenic CO2 emissions on global human nutrition. Nat. Clim. Change 8, 834–839 (2018).

    CAS  Article  Google Scholar 

  61. 61.

    Zomer, R. J., Trabucco, A., Bossio, D. A. & Verchot, L. V. Climate change mitigation: a spatial analysis of global land suitability for clean development mechanism afforestation and reforestation. Agric. Ecosyst. Environ. 126, 67–80 (2008).

    Article  Google Scholar 

  62. 62.

    Hijmans, R. J., Cameron, S. E., Parra, J. L., Jones, P. G. & Jarvis, A. Very high resolution interpolated climate surfaces for global land areas. Int. J. Climatol. 25, 1965–1978 (2005).

    Article  Google Scholar 

  63. 63.

    Anderson, J. M. & Ingram, J. S. I. Tropical Soil Biology and Fertility (CABI, 1989).

  64. 64.

    Kettler, T. A., Doran, J. W. & Gilbert, T. L. Simplified method for soil particle-size determination to accompany soil-quality analyses. Soil Sci. Soc. Am. J. 65, 849–852 (2001).

    CAS  Article  Google Scholar 

  65. 65.

    EPA Method 3050B: Acid Digestion of Sediments, Sludges, and Soils (US Environmental Protection Agency, 1996).

  66. 66.

    Moreno-Jiménez, E. et al. Heavy metals distribution in soils surrounding an abandoned mine in NW Madrid (Spain) and their transference to wild flora. J. Hazard. Mater. 162, 854–859 (2009).

    Article  Google Scholar 

  67. 67.

    Madrid, F., Lopez, R. & Cabrera, F. Metal accumulation in soil after application of municipal solid waste compost under intensive farming conditions. Agric. Ecosyst. Environ. 119, 249–256 (2007).

    CAS  Article  Google Scholar 

  68. 68.

    Moreno-Jiménez, E., Sepúlveda, R., Esteban, E. & Beesley, L. Efficiency of organic and mineral based amendments to reduce metal[loid]mobility and uptake (Lolium perenne) from a pyrite-waste contaminated soil. J. Geochem. Explor. 174, 46–52 (2017).

    Article  Google Scholar 

  69. 69.

    Lindsay, W. L. & Norvell, W. A. Development of a DTPA soil test for zinc, iron, manganese, and copper. Soil Sci. Soc. Am. J. 42, 421–428 (1978).

    CAS  Article  Google Scholar 

  70. 70.

    Liang, J. & Karamanos, R. E. in Soil Sampling and Methods of Analysis (ed. Carter, M. R.) 87–90 (Lewis Publishers, 1993).

  71. 71.

    De Santiago-Martín, A. et al. Improving the relationship between soil characteristics and metal bioavailability by using reactive fractions of soil parameters in calcareous soils. Environ. Toxicol. Chem. 34, 37–44 (2015).

    Article  Google Scholar 

  72. 72.

    Rosseel, Y. lavaan: an R package for structural equation modeling. J. Stat. Softw. 48, 1–36 (2012).

    Article  Google Scholar 

  73. 73.

    R Development Core Team R: A Language and Environment for Statistical Computing (R Foundation for Statistical Computing, 2014).

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We thank all members of the EPES-BIOCOM network for the collection of field data, and all members of the Maestre laboratory for help with data organization and management, as well as comments and discussions about this work. We also thank T. Sizmur, R. L. Chaney and J. Behlert for edits and comments on earlier versions of our manuscript. This work was funded by a 2018 Leonardo Grant for Researchers and Cultural Creators of the BBVA Foundation, and by the European Research Council (ERC grant agreements 242658 (BIOCOM) and 647038 (BIODESERT)). C.P. was supported by Marie Skłodowska-Curie grant agreement number 654132 (VULCAN). H.S. is supported by a Juan de la Cierva-Formación grant from Spanish Ministry of Economy and Competitiveness (FJCI-2015-26782).

Author information




E.M.-J., C.P. and F.T.M. designed the study. F.T.M. coordinated the global dryland survey. E.M.-J. and R.M. prepared, processed and analysed the soil samples for metals. E.M.-J., M.F., H.S., C.P. and F.T.M. contributed to data analysis and interpretation. E.M.-J. drafted the manuscript, with significant contributions to the writing from all co-authors. All authors commented on and approved the final manuscript.

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Correspondence to Eduardo Moreno-Jiménez.

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Supplementary Figures 1–6, Supplementary Table 1, Supplementary References, Model Parameters and R code

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Moreno-Jiménez, E., Plaza, C., Saiz, H. et al. Aridity and reduced soil micronutrient availability in global drylands. Nat Sustain 2, 371–377 (2019).

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