4.8 Article

Soil properties as key predictors of global grassland production: Have we overlooked micronutrients?

Journal

ECOLOGY LETTERS
Volume 24, Issue 12, Pages 2713-2725

Publisher

WILEY
DOI: 10.1111/ele.13894

Keywords

biomass production; climate; grasslands; iron; micronutrients; N deposition; Nutrient Network (NutNet); soil properties; zinc

Categories

Funding

  1. National Science Foundation Research Coordination Network [NSF-DEB--1042132]
  2. Institute on the Environment [DG--0001--13]
  3. Research Foundation--Flanders (FWO)
  4. European Research Council [ERC--SyG--610028 IMBALANCE--P]
  5. Methusalem funding of the Research Council UA
  6. National Science Foundation Long Term Ecological Research [NSF--DEB--1234162, NSF--DEB--1831944]

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Fertilisation experiments have shown that nutrient availability plays a crucial role in grassland biomass production and carbon sequestration. This study, based on a global dataset, found that soil micronutrients, particularly Zn and Fe, along with other soil factors, were key predictors of biomass variation. However, the association between micronutrients and biomass was absent in grasslands limited by NP, highlighting the significance of co-limitation by NP and micronutrients.
Fertilisation experiments have demonstrated that nutrient availability is a key determinant of biomass production and carbon sequestration in grasslands. However, the influence of nutrients in explaining spatial variation in grassland biomass production has rarely been assessed. Using a global dataset comprising 72 sites on six continents, we investigated which of 16 soil factors that shape nutrient availability associate most strongly with variation in grassland aboveground biomass. Climate and N deposition were also considered. Based on theory-driven structural equation modelling, we found that soil micronutrients (particularly Zn and Fe) were important predictors of biomass and, together with soil physicochemical properties and C:N, they explained more unique variation (32%) than climate and N deposition (24%). However, the association between micronutrients and biomass was absent in grasslands limited by NP. These results highlight soil properties as key predictors of global grassland biomass production and point to serial co-limitation by NP and micronutrients.

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