Organic matter distribution in aggregate sizes of a mollisol under contrasting management

Total and particulate organic matter content in different aggregate sizes can be used as an indicator of land use effect. We hypothesized that tillage reduction increases total (SOC) and particulate soil organic C (POC) contents and the stability of larger aggregates of high-SOC-content Mollisols. T...

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Autores principales:	Mandiola,M, Studdert,G.A, Domínguez,G.F, Videla,C.C
Lenguaje:	English
Publicado:	Chilean Society of Soil Science / Sociedad Chilena de la Ciencia del Suelo 2011
Materias:	particulate organic matter soil aggregates aggregate stability tillage systems
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162011000400004
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spelling	oai:scielo:S0718-951620110004000042018-10-31Organic matter distribution in aggregate sizes of a mollisol under contrasting managementMandiola,MStuddert,G.ADomínguez,G.FVidela,C.C particulate organic matter soil aggregates aggregate stability tillage systems Total and particulate organic matter content in different aggregate sizes can be used as an indicator of land use effect. We hypothesized that tillage reduction increases total (SOC) and particulate soil organic C (POC) contents and the stability of larger aggregates of high-SOC-content Mollisols. Three management systems (continuous pasture (Pp), and continuous cropping under conventional tillage (CT) and no-tillage (NT)) were evaluated. Oven dried soil samples (0-5 and 5-20 cm), were wet sieved through 2000, 250 and 50 \|im sieves after immersion (IW) and capillary (CW) wetting. Particulate organic matter (>50 \|im) was separated in both the whole soil and in each aggregate fraction, SOC and mineral associated organic C contents were determined, and POC was calculated by subtraction. Reduced soil disturbance (Pp and NT) yielded more SOC and POC in the whole soil and macroaggregates with higher stability (Pp>NT>CT). Under Pp, macroaggregates showed the highest SOC and POC. Under NT, macroaggregates showed higher SOC and POC and aggregate stability than CT though lower than Pp. Less tillage-induced disruption (Pp and NT) led to higher SOC and POC contents in more stable macroaggregates but continuous no-tillage appeared not to be enough to reverse the effects of long lasting conventional management practices on these Mollisols.info:eu-repo/semantics/openAccessChilean Society of Soil Science / Sociedad Chilena de la Ciencia del SueloJournal of soil science and plant nutrition v.11 n.4 20112011-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162011000400004en10.4067/S0718-95162011000400004
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	particulate organic matter soil aggregates aggregate stability tillage systems
spellingShingle	particulate organic matter soil aggregates aggregate stability tillage systems Mandiola,M Studdert,G.A Domínguez,G.F Videla,C.C Organic matter distribution in aggregate sizes of a mollisol under contrasting management
description	Total and particulate organic matter content in different aggregate sizes can be used as an indicator of land use effect. We hypothesized that tillage reduction increases total (SOC) and particulate soil organic C (POC) contents and the stability of larger aggregates of high-SOC-content Mollisols. Three management systems (continuous pasture (Pp), and continuous cropping under conventional tillage (CT) and no-tillage (NT)) were evaluated. Oven dried soil samples (0-5 and 5-20 cm), were wet sieved through 2000, 250 and 50 \|im sieves after immersion (IW) and capillary (CW) wetting. Particulate organic matter (>50 \|im) was separated in both the whole soil and in each aggregate fraction, SOC and mineral associated organic C contents were determined, and POC was calculated by subtraction. Reduced soil disturbance (Pp and NT) yielded more SOC and POC in the whole soil and macroaggregates with higher stability (Pp>NT>CT). Under Pp, macroaggregates showed the highest SOC and POC. Under NT, macroaggregates showed higher SOC and POC and aggregate stability than CT though lower than Pp. Less tillage-induced disruption (Pp and NT) led to higher SOC and POC contents in more stable macroaggregates but continuous no-tillage appeared not to be enough to reverse the effects of long lasting conventional management practices on these Mollisols.
author	Mandiola,M Studdert,G.A Domínguez,G.F Videla,C.C
author_facet	Mandiola,M Studdert,G.A Domínguez,G.F Videla,C.C
author_sort	Mandiola,M
title	Organic matter distribution in aggregate sizes of a mollisol under contrasting management
title_short	Organic matter distribution in aggregate sizes of a mollisol under contrasting management
title_full	Organic matter distribution in aggregate sizes of a mollisol under contrasting management
title_fullStr	Organic matter distribution in aggregate sizes of a mollisol under contrasting management
title_full_unstemmed	Organic matter distribution in aggregate sizes of a mollisol under contrasting management
title_sort	organic matter distribution in aggregate sizes of a mollisol under contrasting management
publisher	Chilean Society of Soil Science / Sociedad Chilena de la Ciencia del Suelo
publishDate	2011
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162011000400004
work_keys_str_mv	AT mandiolam organicmatterdistributioninaggregatesizesofamollisolundercontrastingmanagement AT studdertga organicmatterdistributioninaggregatesizesofamollisolundercontrastingmanagement AT dominguezgf organicmatterdistributioninaggregatesizesofamollisolundercontrastingmanagement AT videlacc organicmatterdistributioninaggregatesizesofamollisolundercontrastingmanagement
_version_	1714206422836707328

Organic matter distribution in aggregate sizes of a mollisol under contrasting management

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