Summary
Abstract Soil structure controls key soil functions in both natural and agro‐ecosystems. Thus, numerous attempts have been made to develop methods aiming at its characterization. Here we propose an index of soil structure that uses relative entropy to quantify differences in the porosity and pore(void)‐size distribution (VSD) between a structured soil derived from soil water retention data and the same soil without structure (a so‐called reference soil) estimated from its particle‐size distribution (PSD). The difference between these VSDs, which is the result of soil structure, is quantified using the Kullback–Leibler Divergence (KL divergence). We applied the method to soil data from two Swedish field experiments that investigate the long‐term effects of soil management (fallow vs. inorga
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