Water balance creates a threshold in soil pH at the global scale

@article{Slessarev2016WaterBC,
  title={Water balance creates a threshold in soil pH at the global scale},
  author={Eric W. Slessarev and Y. Lin and N. L. Bingham and J. E. Johnson and Y Dai and Joshua P. Schimel and Oliver A. Chadwick},
  journal={Nature},
  year={2016},
  volume={540},
  pages={567-569}
}
Soil pH regulates the capacity of soils to store and supply nutrients, and thus contributes substantially to controlling productivity in terrestrial ecosystems. However, soil pH is not an independent regulator of soil fertility—rather, it is ultimately controlled by environmental forcing. In particular, small changes in water balance cause a steep transition from alkaline to acid soils across natural climate gradients. Although the processes governing this threshold in soil pH are well… 
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