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Soil coarseness is the main process decreasing soil organic matter andthreatening the productivity of sandy grasslands. Previous studiesdemonstrated negative effect of soil coarseness on soil carbon storage, butless is known about how soil base cations (exchangeable Ca, Mg, K, and Na)and available micronutrients (available Fe, Mn, Cu, and Zn) response to soilcoarseness. In a semi-arid grassland of Northern China, a field experimentwas initiated in 2011 to mimic the effect of soil coarseness on soil basecations and available micronutrients by mixing soil with different massproportions of sand: 0 % coarse elements (C0), 10 % (C10), 30 % (C30),50 % (C50), and 70 % (C70). Soil coarseness significantly increased soilpH in three soil depths of 0–10, 10–20 and 20–40 cm with the highestpH values detected in C50 and C70 treatments. Soil fine particles (smallerthan 0.25 mm) significantly decreased with the degree of soil coarseness.Exchangeable Ca and Mg concentrations significantly decreased with soilcoarseness degree by up to 29.8 % (in C70) and 47.5 % (in C70),respectively, across three soil depths. Soil available Fe, Mn, and Cusignificantly decreased with soil coarseness degree by 62.5, 45.4,and 44.4 %, respectively. As affected by soil coarseness, the increase ofsoil pH, decrease of soil fine particles (including clay), and decline insoil organic matter were the main driving factors for the decrease ofexchangeable base cations (except K) and available micronutrients (exceptZn) through soil profile. Developed under soil coarseness, the loss andredistribution of base cations and available micronutrients along soildepths might pose a threat to ecosystem productivity of this sandy grassland

Effect of soil coarseness on soil base cations and available micronutrients in a semi-arid sandy grassland