Authors
Sebastián R Mazzilli, Armen R Kemanian, Oswaldo R Ernst, Robert B Jackson, Gervasio Piñeiro
Publication date
2014/8/1
Journal
Soil Biology and Biochemistry
Volume
75
Pages
273-281
Publisher
Pergamon
Description
The rate of soil organic carbon (CS) loss via microbial respiration (decomposition rate k, y−1), and the rate of stabilization of vegetation inputs (CV) into CS (humification rate h, y−1) are usually considered independent of CV. However, short-term laboratory studies suggest that the quality and quantity of CV controls k, which is often referred to as a priming effect. We investigated how the chemical composition of different residues, (corn and soybean) controls k and h under field conditions in a no-till ecosystem. Using CV-driven shifts in δ13C, we estimated changes in carbon (C) stocks, k and h of both the labile particulate organic matter fraction (CPOM) and the stabilized mineral associated organic matter fraction (CMAOM). After two years of high C inputs (corn: 4.4 Mg ha−1 y−1 aboveground and C:N = 78; soybean: 3.5 Mg ha−1 y−1, C:N = 17), we found no changes in CPOM and CMAOM stocks in the top 5-cm of soil …
Scholar articles
SR Mazzilli, AR Kemanian, OR Ernst, RB Jackson… - Soil Biology and Biochemistry, 2014