| Autor: |
Andrew J. Margenot, Jordon Wade, Finnleigh S. Woodings |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
|
| Zdroj: |
Agricultural & Environmental Letters, Vol 9, Iss 1, Pp n/a-n/a (2024) |
| Druh dokumentu: |
article |
| ISSN: |
2471-9625 |
| DOI: |
10.1002/ael2.20124 |
| Popis: |
Abstract In the last two decades, permanganate has been used to define what is assumed to be a labile or “active” soil carbon (C) pool, commonly referred to as “permanganate‐oxidizable carbon” (POXC). However, uncertainties in the reduction reaction (Mn7+ → Mn4+/Mn2+) and even greater uncertainties in the oxidation reaction (C? → C?) as well as the reaction of non‐C reductants in the soil sample preclude the calculation of milligram C per kilogram of soil oxidized. Combined variation in the reduction–oxidation reactions can entail up to fivefold variation in how much soil organic C is oxidized per unit permanganate reduced. Without determining final reduction state of Mn and the initial and final oxidation states of C, the amount of C oxidized cannot be calculated. Unless a concrete understanding of the reduction and oxidation half‐reactions is achieved, an alternative expression of permanganate reactivity of a soil sample (i.e., not mg C kg−1 soil) is needed. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
|
Plný text