Early-stage changes in chemical phosphorus speciation induced by liming deforested soils

Abstract A hypothesis of whether an increase in Ca2+ due to liming acid soils causes an increase in Ca-phosphates with a concomitant decrease in Al- and Fe-phosphates was tested on a relatively short-term time frame, as observed in the investigations of chemical phosphorus (P) speciation. Soil sampl...

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Autores principales:	Park,Ji-Suk, Ro,Hee-Myong
Lenguaje:	English
Publicado:	Chilean Society of Soil Science / Sociedad Chilena de la Ciencia del Suelo 2018
Materias:	Calcium deforestation equilibrium fractionation interconversion
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162018000200435
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spelling	oai:scielo:S0718-951620180002004352018-11-21Early-stage changes in chemical phosphorus speciation induced by liming deforested soilsPark,Ji-SukRo,Hee-Myong Calcium deforestation equilibrium fractionation interconversion Abstract A hypothesis of whether an increase in Ca2+ due to liming acid soils causes an increase in Ca-phosphates with a concomitant decrease in Al- and Fe-phosphates was tested on a relatively short-term time frame, as observed in the investigations of chemical phosphorus (P) speciation. Soil samples were taken at a deforested site and split into three treatment groups: a control and two CaCO3 treatments (0.1 and 0.4 g CaCO3 in 100 g soil). Each soil was incubated at 25±2°C for 40 days. Inorganic-P was partitioned into three fractions: Fraction-A (Al- and occluded Fe-P), Fraction-B (non-occluded Fe- and adsorbed-P), and Fraction-C (Ca-P). The pH of CaCO3-treated soils decreased right after liming, indicating a probable formation of solid phosphate compounds. Available P in CaCO3-treated soils decreased from 0.67 mg kg-1 to control levels at the end of incubation. Total-P and organic-P of CaCO3-treated soils were virtually the same as those of control soils, while inorganic-P varied. Fraction-A in both CaCO3-treated soils peaked at 10 days of incubation, and then decreased below control levels, while Fraction-B decreased abruptly right after liming, and thereafter gradually decreased. Liming decreased Fraction-C, and caused an increase in Al- and Fe-P due to an increase in exchangeable Al3+ and Fe3+. Our results challenge the hypothesis by showing the unexpected opposite data for Al-, Fe- and Ca-P compounds at least in the early stage of equilibrium disturbances due to liming an acidic soil.info:eu-repo/semantics/openAccessChilean Society of Soil Science / Sociedad Chilena de la Ciencia del SueloJournal of soil science and plant nutrition v.18 n.2 20182018-06-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162018000200435en10.4067/S0718-95162018005001303
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Calcium deforestation equilibrium fractionation interconversion
spellingShingle	Calcium deforestation equilibrium fractionation interconversion Park,Ji-Suk Ro,Hee-Myong Early-stage changes in chemical phosphorus speciation induced by liming deforested soils
description	Abstract A hypothesis of whether an increase in Ca2+ due to liming acid soils causes an increase in Ca-phosphates with a concomitant decrease in Al- and Fe-phosphates was tested on a relatively short-term time frame, as observed in the investigations of chemical phosphorus (P) speciation. Soil samples were taken at a deforested site and split into three treatment groups: a control and two CaCO3 treatments (0.1 and 0.4 g CaCO3 in 100 g soil). Each soil was incubated at 25±2°C for 40 days. Inorganic-P was partitioned into three fractions: Fraction-A (Al- and occluded Fe-P), Fraction-B (non-occluded Fe- and adsorbed-P), and Fraction-C (Ca-P). The pH of CaCO3-treated soils decreased right after liming, indicating a probable formation of solid phosphate compounds. Available P in CaCO3-treated soils decreased from 0.67 mg kg-1 to control levels at the end of incubation. Total-P and organic-P of CaCO3-treated soils were virtually the same as those of control soils, while inorganic-P varied. Fraction-A in both CaCO3-treated soils peaked at 10 days of incubation, and then decreased below control levels, while Fraction-B decreased abruptly right after liming, and thereafter gradually decreased. Liming decreased Fraction-C, and caused an increase in Al- and Fe-P due to an increase in exchangeable Al3+ and Fe3+. Our results challenge the hypothesis by showing the unexpected opposite data for Al-, Fe- and Ca-P compounds at least in the early stage of equilibrium disturbances due to liming an acidic soil.
author	Park,Ji-Suk Ro,Hee-Myong
author_facet	Park,Ji-Suk Ro,Hee-Myong
author_sort	Park,Ji-Suk
title	Early-stage changes in chemical phosphorus speciation induced by liming deforested soils
title_short	Early-stage changes in chemical phosphorus speciation induced by liming deforested soils
title_full	Early-stage changes in chemical phosphorus speciation induced by liming deforested soils
title_fullStr	Early-stage changes in chemical phosphorus speciation induced by liming deforested soils
title_full_unstemmed	Early-stage changes in chemical phosphorus speciation induced by liming deforested soils
title_sort	early-stage changes in chemical phosphorus speciation induced by liming deforested soils
publisher	Chilean Society of Soil Science / Sociedad Chilena de la Ciencia del Suelo
publishDate	2018
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162018000200435
work_keys_str_mv	AT parkjisuk earlystagechangesinchemicalphosphorusspeciationinducedbylimingdeforestedsoils AT roheemyong earlystagechangesinchemicalphosphorusspeciationinducedbylimingdeforestedsoils
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Early-stage changes in chemical phosphorus speciation induced by liming deforested soils

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