Effect of soil coarseness on soil base cations and available micronutrients in a semi-arid sandy grassland
Open Access
- 12 April 2016
- journal article
- research article
- Published by Copernicus GmbH in Solid Earth
- Vol. 7 (2), 549-556
- https://doi.org/10.5194/se-7-549-2016
Abstract
Soil coarseness is the main process decreasing soil organic matter and threatening the productivity of sandy grasslands. Previous studies demonstrated negative effect of soil coarseness on soil carbon storage, but less is known about how soil base cations (exchangeable Ca, Mg, K, and Na) and available micronutrients (available Fe, Mn, Cu, and Zn) response to soil coarseness. In a semi-arid grassland of Northern China, a field experiment was initiated in 2011 to mimic the effect of soil coarseness on soil base cations and available micronutrients by mixing soil with different mass proportions of sand: 0 % coarse elements (C0), 10 % (C10), 30 % (C30), 50 % (C50), and 70 % (C70). Soil coarseness significantly increased soil pH in three soil depths of 0–10, 10–20 and 20–40 cm with the highest pH values detected in C50 and C70 treatments. Soil fine particles (smaller than 0.25 mm) significantly decreased with the degree of soil coarseness. Exchangeable Ca and Mg concentrations significantly decreased with soil coarseness degree by up to 29.8 % (in C70) and 47.5 % (in C70), respectively, across three soil depths. Soil available Fe, Mn, and Cu significantly decreased with soil coarseness degree by 62.5, 45.4, and 44.4 %, respectively. As affected by soil coarseness, the increase of soil pH, decrease of soil fine particles (including clay), and decline in soil organic matter were the main driving factors for the decrease of exchangeable base cations (except K) and available micronutrients (except Zn) through soil profile. Developed under soil coarseness, the loss and redistribution of base cations and available micronutrients along soil depths might pose a threat to ecosystem productivity of this sandy grassland.This publication has 47 references indexed in Scilit:
- Reversal of desertification: The role of physical and chemical soil propertiesJournal of Arid Environments, 2010
- Desertification effects on C and N content of sandy soils under grassland in Horqin, northern ChinaGeoderma, 2008
- Dynamics of soil physical and chemical properties and vegetation succession characteristics during grassland desertification under sheep grazing in an agro-pastoral transition zone in Northern ChinaJournal of Arid Environments, 2007
- Influences of continuous grazing and livestock exclusion on soil properties in a degraded sandy grassland, Inner Mongolia, northern ChinaCATENA, 2005
- Fractal features of soil particle size distribution and the implication for indicating desertificationGeoderma, 2004
- THE UPLIFT OF SOIL NUTRIENTS BY PLANTS: BIOGEOCHEMICAL CONSEQUENCES ACROSS SCALESEcology, 2004
- The chemistry of pedogenic thresholdsGeoderma, 2001
- Spatial Variability of Soil Properties in the Shortgrass Steppe: The Relative Importance of Topography, Grazing, Microsite, and Plant Species in Controlling Spatial PatternsEcosystems, 1999
- Wind erosion in agricultural soils: an example of limited supply of particles available for erosionCATENA, 1998
- A new mechanism for calcium loss in forest-floor soilsNature, 1995