Global rates of soil production independent of soil depth

作者: Gilles Brocard , Emma Jayne Harrison , Jane Willenbring

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摘要: Accelerated rates of soil erosion threaten the stability ecosystems1, nutrient cycles2, and global food supplies3 if processes that produce cannot keep pace. Over millennial timescales, rate production is thought to pace with surface through negative feedbacks between thickness at which produced from underlying mineral substrate4,5. This paradigm in Earth Sciences holds some mechanism lowers when thick increases soils are thin. dynamic balance lends support two observations: First, covers >90% Earth’s ice-free (NRCS) despite vary by three orders magnitude3 second, on exists within a relatively narrow range even old deeply weathered landscapes7. However, actual coupling depth unknown, functional form relationship debated. Here, we question whether this apparent feedback instead arises computational artefact how calculated landscapes changing rates. As evidence, compared sites have likely experienced constant climate over geologic timescales may experience transient responses environmental change compilation versus thickness. We conclude resists self-arresting behavior locations uniformly slow arid semi-arid settings - independent depth. result has drastic consequences for sustainability context anthropogenically accelerated such an acceleration modern not give rise concomitant, matched production.

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