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Short‐ T erm Stabilization of Organic Matter in Physically, Chemically, and Biochemically Protected Pools in Soils Amended with Municipal Wastes
Author(s) -
Fernández José M.,
LópezdeSá Esther G.,
Polo Alfredo,
Plaza César
Publication year - 2014
Publication title -
clean – soil, air, water
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 66
eISSN - 1863-0669
pISSN - 1863-0650
DOI - 10.1002/clen.201300127
Subject(s) - compost , sewage sludge , organic matter , chemistry , soil water , environmental chemistry , biodegradable waste , sewage , humic acid , soil organic matter , environmental science , waste management , environmental engineering , agronomy , soil science , organic chemistry , biology , fertilizer , engineering
Increased understanding of the stabilization mechanisms of the organic matter (OM) entering the soil system through the application of organic amendments is of paramount agronomic and environmental importance. Here, we examined the organic C and total N distribution in OM pools (i.e. free, intra‐macroaggregate, intra‐microaggregate, mineral‐associated, dissolved, and humic acid fractions) characterized by different protection mechanisms in soils annually amended with different organic substrates of municipal origin (i.e. municipal solid waste compost, sewage sludge compost, and thermally dried sewage sludge) for three years. With respect to the unamended control soil, the application of the three organic materials, especially thermally dried sewage sludge, increased soil organic C, and total N contents. The organic inputs accumulated mostly in the physically unprotected free OM pool, as relatively fresh, low humified materials, and secondarily in the intra‐macroaggregate fraction, as partially decomposed OM weakly protected by physical mechanisms. Our results suggest that mechanisms related to strong physical protection in microaggregates and chemical inaccessibility by intimate association with minerals do not govern OM stabilization in the short term.