esoilБюллетень Почвенного института имени В.В. ДокучаеваDokuchaev Soil Bulletin0136-16942312-4202V.V. Dokuchaev Soil Science Institute10.19047/0136-1694-2023-115-54-86esoil-760Research ArticleСтатьиНесиликатное железо минерально-ассоциированного органического вещества агрочерноземов разной локализации на склонеNon-silicate iron in mineral-associated organic matter of agro-chernozems located on different positions on the slopeЦомаеваЕ. В.TsomaevaE. V.

119017, Москва, Пыжевский пер, 7, стр. 2

7 Bld. 2 Pyzhevskiy per., Moscow 119017

liza1999.01@yandex.ruАртемьеваЗ. С.ArtemyevaZ. S.

Зинаида Семеновна Артемьева

119017, Москва, Пыжевский пер, 7, стр. 2

7 Bld. 2 Pyzhevskiy per., Moscow 119017

artemyevazs@mail.ruЗасухинаЕ. С.ZasukhinaE. S.

Зинаида Семеновна Артемьева

119333, Москва, Вавилова, 44, кор. 2

44 Bld. 2 Vavilova Str., Moscow 119333

elenzet@bk.ruВарламовЕ. Б.VarlamovE. B.

Евгений Борисович Варламов

119017, Москва, Пыжевский пер, 7, стр. 2

7 Bld. 2 Pyzhevskiy per., Moscow 119017

evgheni968@rambler.ruФИЦ “Почвенный институт им. В.В. Докучаева”РоссияFederal Research Centre “V.V. Dokuchaev Soil Science Institute”Russian FederationФИЦ "Информатика и управление" РАНРоссияFederal Research Centre “Informatics and Management”, Russian Academy of SciencesRussian Federation20230408202301155486Copyright © Цомаева Е.В., Артемьева З.С., Засухина Е.С., Варламов Е.Б., 20232023Цомаева Е.В., Артемьева З.С., Засухина Е.С., Варламов Е.Б.Tsomaeva E.V., Artemyeva Z.S., Zasukhina E.S., Varlamov E.B.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://bulletin.esoil.ru/jour/article/view/760

Представлены данные по содержанию валового несиликатного железа (Fed) в минерально-ассоциированном органическом веществе (MAOM) агрочерноземов разной локализации на склоне. Распределение валового несиликатного железа в профиле следует таковому органического углерода: максимальные величины приурочены к поверхностным горизонтам и снижаются вниз по профилю. Выявлено, что изменение содержания несиликатного железа в MAOM илистой фракции в пахотных горизонтах смытых агрочерноземов является следствием эрозионных процессов, включая их интенсивность, зависящей, в том числе, от крутизны склона. Мéньшая крутизна склона (4°) способствует увеличению нагрузки органического углерода (ОС) на оксиды железа, результатом чего является увеличение десорбируемости железа, тогда как в условиях бóльшей крутизны (6°) наблюдается снижение десорбируемости железа. Мольное отношение ОС/Fed предлагается в качестве дополнительного индикационного параметра степени смытости почв. В илистых фракциях, вне зависимости от их локализации в профиле, а также вне зависимости от положения исследованных агрочерноземов на склоне, преобладающим механизмом стабилизации ОВ было образование органо-железосодержащих комплексов (ОС/Fed > 10). В гумусовых горизонтах во фракции Остаток несиликатное железо, по-видимому, присутствует, преимущественно, в виде карбонатов железа (FeCO3), а доля собственно устойчивых в ультразвуковом поле микроагрегатов, ОВ которых представлено, преимущественно, гумином, относительно невелика на фоне абсолютного доминирования в составе данной фракции первичных минералов (вес. %). Бóльшая часть несиликатного железа минеральноассоциированного ОВ, извлекаемого дитионит-цитрат-бикарбонатной вытяжкой локализуется в илистой фракции – 2/3 и более.

Data on total non-silicate iron (Fed) content in mineral-associated organic matter (MAOM) of agro-chernozems of different localization on the slope are presented. The distribution of total non-silicate iron in soil profile follows that of organic carbon (OC): the maximum values are confined to the surface horizons, and decrease down the profile. It has been revealed that the change in the content of non-silicate iron in the MAOM of the clay fraction in arable horizons of eroded agro-chernozems is a result of erosion processes, including their intensity, which also depends, among other things, on the slope steepness. A lower slope steepness (4°) contributes to an increase in the organic carbon loading on iron oxides, resulting in an increased in iron desorption capacity, while a higher slope steepness (6°) results in lower iron desorption capacity. The OC/Fed molar ratio is suggested as an additional indicator of the degree of soil erosion. In clay fractions, of both their position in the soil profile and their position on the slope, the predominant mechanism of organic matter stabilization was the formation of organic-iron complexes (OC/Fed > 10). In the Residue fraction of humus horizons, non-silicate iron seems to be presented mainly as iron carbonates (FeCO3), while the proportion of microaggregates (stable under the sonication), where OM is mainly humin, is relatively low against the background of the absolute dominance of primary minerals in this fraction (weight %). Most of the non-silicate iron of mineralassociated OM extracted by dithionite-citrate-hydrocarbonate is localized in the clay fraction – 2/3 or more.

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The authors declare that there are no conflicts of interest present.