Journal
COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS
Volume 48, Issue 17, Pages 2013-2031Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/00103624.2017.1406099
Keywords
Aggregation; carbon stock; cover management; stratification; tillage
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This study reveals that soil organic matter (SOM) is 58% soil organic carbon (SOC) and the processes that govern SOM dynamics include those that promote SOM synthesis from organic inputs and those that decrease SOM through decomposition. Land use is a key determinant of SOC dynamics and spatial differences in SOM. Agricultural soils can accommodate extra carbon (C) between 140 and 170 Pg C. Globally sub soils store more than half of total SOC. The SOM can increase under no-tillage management even with low crop residue input. Soil tillage induces loss of carbon in macroaggregates (>250 m) and a gain of carbon in microaggregates (<250 m). The stage of plant development rather than plant species determines carbon dynamics from plants to soil, and the rate depends on the plant development. However, sorption of dissolved organic matter to mineral soil influences the stabilization of dissolved organic matter.
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