Journal
GLOBAL BIOGEOCHEMICAL CYCLES
Volume 36, Issue 1, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2021GB007128
Keywords
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Funding
- National Natural Science Foundation of China [32001181]
- Natural Science Foundation of Jiangsu Province [BK20200552]
- Postdoctoral Innovation Talent Support Program of China [BX20200169]
- China Postdoctoral Science Foundation [2020M671515]
- NSF [DEB 1802745]
- National Science Foundation
- National Science Foundation through the NEON Program
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Soil pH is the primary factor controlling the abundance of Fe-associated C globally, mainly by influencing the binding of C with Fe minerals. Fe-associated C shows a significant increase when soil pH decreases from 4.2 to 3.5, while the change is small when pH > 4.2.
Association of organic carbon (C) with iron (Fe) minerals is one important mechanism for long-term terrestrial C storage. Yet, specific edaphic variables that directly contribute to Fe-associated C across diverse soil types are still unclear. Through analyzing soils from the National Ecological Observatory Network (NEON) and other published data, here we show that soil pH primarily controls Fe-associated C across the globe. Fe-associated C in most soils ranged from 0 to 20 g kg(-1) soil, with a strong increase from pH 4.2 to 3.5, but a small change in soils with pH > 4.2. A microcosm experiment further showed that raising soil pH by liming reduced the formation of Fe-associated C in an acidic Oxisol. Together, these findings demonstrate the dominant role of soil pH in controlling the abundance of Fe-associated C.
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