Summary
• Macropore characteristics in arable topsoils were quantified using X-ray tomography. • The degree of preferential transport (PT) was determined under near-saturated conditions. • Macropore connectivity measures did not regulate the PT. • The PT was regulated by the abundance of mesopores and small macropores. • Increasing soil organic carbon may reduce the PT by its effects on pore size distribution. An improved understanding of preferential solute transport in soil macropores would enable more reliable predictions of the fate of agrochemicals and the protection of water quality in agricultural landscapes. The objective of this study was to investigate how soil organic carbon (SOC) and soil texture shape soil pore structure and thereby determine the susceptibility to preferential transpo
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