Soil Organic Matter Quality Indicators in a Cultivated Andisol

Agricultural practices influence the dynamics of soil organic matter (MOS) and its fractions. In this study, the following labile fractions of soil organic matter were determined: free light fraction (FLL), intra-aggregate light fraction (FLI), microbial biomass and mineralized C-CO2, on volcanic so...

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Autores principales:	Zagal,Erick, Córdova,Carolin
Lenguaje:	English
Publicado:	Instituto de Investigaciones Agropecuarias, INIA 2005
Materias:	free light fraction physical fractionation NaI soil microbial biomass fumigation-incubation
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072005000200008
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spelling	oai:scielo:S0365-280720050002000082005-08-26Soil Organic Matter Quality Indicators in a Cultivated AndisolZagal,ErickCórdova,Carolin free light fraction physical fractionation NaI soil microbial biomass fumigation-incubation Agricultural practices influence the dynamics of soil organic matter (MOS) and its fractions. In this study, the following labile fractions of soil organic matter were determined: free light fraction (FLL), intra-aggregate light fraction (FLI), microbial biomass and mineralized C-CO2, on volcanic soil with different rotations, and later their use was evaluated as biological indicators of the impact of agricultural practices on the soil. The study was carried out in an eight year field experiment, with different productive systems (rotations) in a randomized complete block design. The free light fraction (FLL) was determined by density fractionation with NaI (1.8 g cm-3), and the intra-aggregate light fraction (FLI) was obtained by sonication (1,500 J s-1). Microbial biomass was quantified using the chloroform fumigation-incubation (FI) technique, and the basal soil respiration (C-CO2 evolution) was determined by incubation for a 10-day period. Increased soil use intensity decreased (P ≤ 0.05) C and N FLL contents, from 1.69 g C-FLL kg-1 soil (5-year rotation with alfalfa, Medicago sativa L.), to 0.49 g C-FLL kg-1 (annual crop rotation). However, these contents in FLI did not show a clear and consistent tendency (P ≤ 0.05). Soil biomass C and N decreased (P ≤ 0.05) with higher soil use intensity, from 551 to 264 μg C-CO2 g soil-1 and from 106 to 35 μg N-(NO3- + NH4+) g soil-1, respectively. The three studied indices were appropriate indicators to determine changes in soil organic matter quality as a result of agricultural practices.info:eu-repo/semantics/openAccessInstituto de Investigaciones Agropecuarias, INIAAgricultura Técnica v.65 n.2 20052005-06-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072005000200008en10.4067/S0365-28072005000200008
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	free light fraction physical fractionation NaI soil microbial biomass fumigation-incubation
spellingShingle	free light fraction physical fractionation NaI soil microbial biomass fumigation-incubation Zagal,Erick Córdova,Carolin Soil Organic Matter Quality Indicators in a Cultivated Andisol
description	Agricultural practices influence the dynamics of soil organic matter (MOS) and its fractions. In this study, the following labile fractions of soil organic matter were determined: free light fraction (FLL), intra-aggregate light fraction (FLI), microbial biomass and mineralized C-CO2, on volcanic soil with different rotations, and later their use was evaluated as biological indicators of the impact of agricultural practices on the soil. The study was carried out in an eight year field experiment, with different productive systems (rotations) in a randomized complete block design. The free light fraction (FLL) was determined by density fractionation with NaI (1.8 g cm-3), and the intra-aggregate light fraction (FLI) was obtained by sonication (1,500 J s-1). Microbial biomass was quantified using the chloroform fumigation-incubation (FI) technique, and the basal soil respiration (C-CO2 evolution) was determined by incubation for a 10-day period. Increased soil use intensity decreased (P ≤ 0.05) C and N FLL contents, from 1.69 g C-FLL kg-1 soil (5-year rotation with alfalfa, Medicago sativa L.), to 0.49 g C-FLL kg-1 (annual crop rotation). However, these contents in FLI did not show a clear and consistent tendency (P ≤ 0.05). Soil biomass C and N decreased (P ≤ 0.05) with higher soil use intensity, from 551 to 264 μg C-CO2 g soil-1 and from 106 to 35 μg N-(NO3- + NH4+) g soil-1, respectively. The three studied indices were appropriate indicators to determine changes in soil organic matter quality as a result of agricultural practices.
author	Zagal,Erick Córdova,Carolin
author_facet	Zagal,Erick Córdova,Carolin
author_sort	Zagal,Erick
title	Soil Organic Matter Quality Indicators in a Cultivated Andisol
title_short	Soil Organic Matter Quality Indicators in a Cultivated Andisol
title_full	Soil Organic Matter Quality Indicators in a Cultivated Andisol
title_fullStr	Soil Organic Matter Quality Indicators in a Cultivated Andisol
title_full_unstemmed	Soil Organic Matter Quality Indicators in a Cultivated Andisol
title_sort	soil organic matter quality indicators in a cultivated andisol
publisher	Instituto de Investigaciones Agropecuarias, INIA
publishDate	2005
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072005000200008
work_keys_str_mv	AT zagalerick soilorganicmatterqualityindicatorsinacultivatedandisol AT cordovacarolin soilorganicmatterqualityindicatorsinacultivatedandisol
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Soil Organic Matter Quality Indicators in a Cultivated Andisol

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