Impact of siltation on the stability of organic matter in drained peatlands

Peatlands are unique ecosystems but when they are drained for agriculture or peat mining, stored carbon is released to the atmosphere as CO2. The aim of the study was to assess the influence of siltation on secondary humification basing on humification indicators (C/N ratio, humification degree, hum...

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Autores principales:	Barbara Kalisz, Paweł Urbanowicz, Sławomir Smólczyński, Mirosław Orzechowski
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Humus compounds Drainage Secondary humification Organic carbon Total nitrogen Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/3163e9d4d4dd41668e9259094603e5d1
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spelling	oai:doaj.org-article:3163e9d4d4dd41668e9259094603e5d12021-12-01T04:59:43ZImpact of siltation on the stability of organic matter in drained peatlands1470-160X10.1016/j.ecolind.2021.108149https://doaj.org/article/3163e9d4d4dd41668e9259094603e5d12021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X21008141https://doaj.org/toc/1470-160XPeatlands are unique ecosystems but when they are drained for agriculture or peat mining, stored carbon is released to the atmosphere as CO2. The aim of the study was to assess the influence of siltation on secondary humification basing on humification indicators (C/N ratio, humification degree, humification index, E4/E6 ratio). It is essential to examine to what extent siltation hampers soil organic matter (SOM) oxidation. The study revealed that after drainage the amount of humus fractions, both acid and alkali soluble, were increasing at the expense of non-soluble carbon pool (residuum). Siltation hampered the transformation of organic matter and the quantities of OC and N in humus fractions were lower in silted soil samples than in not silted ones. The carbon extracted in acid-soluble fraction was not related to the state of siltation and was associated with the depth. The nitrogen content in this fraction did not change after drainage or siltation. The siltation did not affect C/N ratios. In unaltered peats these ratios were typical for fen soils (lowland peats) but in other studied soil samples the values of the C/N ratios suggested secondary transformation. The humification indicators (HI, HD and E4/E6) also revealed that secondary humification was more advanced in strongly silted soils, i.e. the stability of SOM in these soils is lower and the values of these indicators were dependent on the state of siltation. The study revealed that both drainage and siltation of soils changed the relations in SOM fractions. Drainage of peatlands resulted in initiation of the secondary humification of SOM and increase of chemically extractable humus fractions as well as increase of the humification degree. Stable SOM, which can have a mean residence time of centuries, became a potential source of CO2. However, siltation which led to a 50% decrease in SOM, hampered oxidation of SOM and had a stabilizing effect on SOM quality. These findings provide new insights into possibilities of mitigation of C losses from agricultural areas and may serve as a guidance for soil C management.Barbara KaliszPaweł UrbanowiczSławomir SmólczyńskiMirosław OrzechowskiElsevierarticleHumus compoundsDrainageSecondary humificationOrganic carbonTotal nitrogenEcologyQH540-549.5ENEcological Indicators, Vol 130, Iss , Pp 108149- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Humus compounds Drainage Secondary humification Organic carbon Total nitrogen Ecology QH540-549.5
spellingShingle	Humus compounds Drainage Secondary humification Organic carbon Total nitrogen Ecology QH540-549.5 Barbara Kalisz Paweł Urbanowicz Sławomir Smólczyński Mirosław Orzechowski Impact of siltation on the stability of organic matter in drained peatlands
description	Peatlands are unique ecosystems but when they are drained for agriculture or peat mining, stored carbon is released to the atmosphere as CO2. The aim of the study was to assess the influence of siltation on secondary humification basing on humification indicators (C/N ratio, humification degree, humification index, E4/E6 ratio). It is essential to examine to what extent siltation hampers soil organic matter (SOM) oxidation. The study revealed that after drainage the amount of humus fractions, both acid and alkali soluble, were increasing at the expense of non-soluble carbon pool (residuum). Siltation hampered the transformation of organic matter and the quantities of OC and N in humus fractions were lower in silted soil samples than in not silted ones. The carbon extracted in acid-soluble fraction was not related to the state of siltation and was associated with the depth. The nitrogen content in this fraction did not change after drainage or siltation. The siltation did not affect C/N ratios. In unaltered peats these ratios were typical for fen soils (lowland peats) but in other studied soil samples the values of the C/N ratios suggested secondary transformation. The humification indicators (HI, HD and E4/E6) also revealed that secondary humification was more advanced in strongly silted soils, i.e. the stability of SOM in these soils is lower and the values of these indicators were dependent on the state of siltation. The study revealed that both drainage and siltation of soils changed the relations in SOM fractions. Drainage of peatlands resulted in initiation of the secondary humification of SOM and increase of chemically extractable humus fractions as well as increase of the humification degree. Stable SOM, which can have a mean residence time of centuries, became a potential source of CO2. However, siltation which led to a 50% decrease in SOM, hampered oxidation of SOM and had a stabilizing effect on SOM quality. These findings provide new insights into possibilities of mitigation of C losses from agricultural areas and may serve as a guidance for soil C management.
format	article
author	Barbara Kalisz Paweł Urbanowicz Sławomir Smólczyński Mirosław Orzechowski
author_facet	Barbara Kalisz Paweł Urbanowicz Sławomir Smólczyński Mirosław Orzechowski
author_sort	Barbara Kalisz
title	Impact of siltation on the stability of organic matter in drained peatlands
title_short	Impact of siltation on the stability of organic matter in drained peatlands
title_full	Impact of siltation on the stability of organic matter in drained peatlands
title_fullStr	Impact of siltation on the stability of organic matter in drained peatlands
title_full_unstemmed	Impact of siltation on the stability of organic matter in drained peatlands
title_sort	impact of siltation on the stability of organic matter in drained peatlands
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/3163e9d4d4dd41668e9259094603e5d1
work_keys_str_mv	AT barbarakalisz impactofsiltationonthestabilityoforganicmatterindrainedpeatlands AT pawełurbanowicz impactofsiltationonthestabilityoforganicmatterindrainedpeatlands AT sławomirsmolczynski impactofsiltationonthestabilityoforganicmatterindrainedpeatlands AT mirosławorzechowski impactofsiltationonthestabilityoforganicmatterindrainedpeatlands
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Impact of siltation on the stability of organic matter in drained peatlands

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