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Carbon Sequestration in Microaggregates of No-Tillage Soils with Different Clay Mineralogy

^a Natural Resource Ecology Lab., Colorado State Univ., Fort Collins, CO 80523
^b Dep. of Agronomy and Range Science, Univ. of California, Davis, CA 95616
^c Lab. for Soil and Water Management, Katholieke Universiteit Leuven, Kasteelpark Arenberg 20, 3001 Heverlee, Belgium
^d Dep. of Soil and Crop Sciences and Natural Resource Ecology Lab., Colorado State Univ., Fort Collins, CO 80523

View larger version (21K): [in a new window]   Fig. 1. Percentage of microaggregates (53- to 250-µm) found within large (>2000 µm) and small (250- to 2000-µm) macroaggregates in 0- to 5- and 5- to 20-cm soil layers under no-tillage (NT) and conventional tillage (CT) management. (2:1 = temperate soil from Sidney [NE] dominated by 2:1 clay minerals; mixed = moderately weathered soil from Lexington [KY] dominated by mixed [2:1 and 1:1] clay mineralogy and oxides; 1:1 = highly weathered soil from Passo Fundo [Brazil] dominated by 1:1 clay minerals and oxides; ND = not determined). Values followed by a different lowercase letter within a tillage treatment, macroaggregate-size class and soil layer are significantly different among soils. Values followed by * within a soil, macroaggregate size class and soil layer are significantly different between tillage treatments. Statistical significance was determined at P < 0.05.

View larger version (19K): [in a new window]   Fig. 2. Total C concentrations of macroaggregate-protected microaggregate-associated fractions in 0- to 5- and 5- to 20-cm soil layers under no-tillage (NT) and conventional tillage (CT) management. (2:1 = temperate soil from Sidney [NE] dominated by 2:1 clay minerals; mixed = moderately weathered soil from Lexington [KY] dominated by mixed [2:1 and 1:1] clay mineralogy and oxides; 1:1 = highly weathered soil from Passo Fundo [Brazil] dominated by 1:1 clay minerals and oxides; mineral-mM-C = C associated with the mineral fraction of microaggregates; intra-mM-POM-C = C associated with particulate organic matter protected inside microaggregates; inter-mM-POM-C = C associated with particulate organic matter located outside microaggregates). Values followed by a different lowercase letter within a tillage treatment, C fraction and soil layer are significantly different among soils. Values followed by * within a soil, C fraction and soil layer are significantly different between tillage treatments. Statistical significance was determined at P < 0.05. (*) indicates P < 0.06.