Manganese Oxidation States in Volcanic Soils across Annual Rainfall Gradients

Ke Wen; Oliver A. Chadwick; Peter M. Vitousek

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Manganese Oxidation States in Volcanic Soils across Annual Rainfall Gradients

机译：Manganese Oxidation States in Volcanic Soils across Annual Rainfall Gradients

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Manganese (Mn) exists as Mn(ll), Mn(IIl), or Mn(IV) in soils, and the Mn oxidation state controls the roles of Mn in numerous environmental processes. However, the variations of Mn oxidation states with climate remain unknown. We determined the Mn oxidation states in highly weathered bulk volcanic soils (primary minerals free) across two rainfall gradients covering mean annual precipitation (MAP) of 0.25—5 m in the Hawaiian Islands. With increasing MAP, the soil redox conditions generally shifted from oxic to suboxic and to anoxic despite fluctuating at each site; concurrently, the proportions of Mn(lV) and Mn(ll) decreased and increased, respectively. Mn(lll) was low at both low and high MAP, but accumulated substantially, up to 80% of total Mn, in soils with prevalent suboxic conditions at intermediate MAP. Mn(lll) was likely hosted in Mn(lII,IV) and iron(lll) oxides or complexed with organic matter, and its distribution among these hosts varied with soil redox potentials and soil pH. Soil redox conditions and rainfall-driven leaching jointly controlled exchangeable Mn(ll) in soils, with its concentration peaking at intermediate MAP. The Mn redox chemistry was at disequilibrium, with the oxidation states correlating with long-term average soil redox potentials better than with soil pH. The soil redox conditions likely fluctuated between oxic and anoxic conditions more frequently at intermediate than at low and high MAP, creating biogeochemical hot spots where Mn, Fe, and other redox-sensitive elements may be actively cycled.

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《Environmental Science & Technology: ES&T》 |2023年第1期|730-740|共11页
作者
Ke Wen; Oliver A. Chadwick; Peter M. Vitousek;
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作者单位

Department of Ecosystem Science and Management, University of Wyoming Laramie, Wyoming 82071, United States;

Department of Geography, University of California, Santa Barbara, California 93106, United States;

Department of Biology, Stanford University, Stanford, California 9430S, United States;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类环境科学、安全科学;
关键词
manganese oxidation states; soils; mean annual precipitation; redox fluctuations;

Manganese Oxidation States in Volcanic Soils across Annual Rainfall Gradients

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