Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1088/1748-9326/ab2c11 |
What do we know about soil carbon destabilization? | |
Bailey, Vanessa L.1; Pries, Caitlin Hicks2; Lajtha, Kate3 | |
2019-08-01 | |
发表期刊 | ENVIRONMENTAL RESEARCH LETTERS |
ISSN | 1748-9326 |
出版年 | 2019 |
卷号 | 14期号:8 |
文章类型 | Review |
语种 | 英语 |
国家 | USA |
英文摘要 | Most empirical and modeling research on soil carbon (C) dynamics has focused on those processes that control and promote C stabilization. However, we lack a strong, generalizable understanding of the mechanisms through which soil organic carbon (SOC) is destabilized in soils. Yet a clear understanding of C destabilization processes in soil is needed to quantify the feedbacks of the soil C cycle to the Earth system. Destabilization includes processes that occur along a spectrum through which SOC shifts from a 'protected' state to an 'available' state to microbial cells where it can be mineralized to gaseous forms or to soluble forms that are then lost from the soil system. These processes fall into three general categories: (1) release from physical occlusion through processes such as tillage, bioturbation, or freeze-thaw and wetting-drying cycles; (2) C desorption from soil solids and colloids; and (3) increased C metabolism. Many processes that stabilize soil C can also destabilize C, and C gain or loss depends on the balance between competing reactions. For example, earthworms may both destabilize C through aggregate destruction, but may also create new aggregates and redistribute C into mineral horizon. Similarly, mycorrhizae and roots form new soil C but may also destabilize old soil C through priming and promoting microbial mining; labile C inputs cause C stabilization through increased carbon use efficiency or may fuel priming. Changes to the soil environment that affect the solubility of minerals or change the relative surfaces charges of minerals can destabilize SOC, including increased pH or in the reductive dissolution of Fe-bearing minerals. By considering these different physical, chemical, and biological controls as processes that contribute to soil C destabilization, we can develop thoughtful new hypotheses about the persistence and vulnerability of C in soils and make more accurate and robust predictions of soil C cycling in a changing environment. |
英文关键词 | soil organic carbon destabilization physical occlusion metabolism bioavailability priming Birch effect |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000478754600002 |
WOS关键词 | DISSOLVED ORGANIC-CARBON ; FREEZE-THAW CYCLES ; AGGREGATE SIZE DISTRIBUTION ; PRINCE-EDWARD-ISLAND ; WET-DRY CYCLES ; USE EFFICIENCY ; NO-TILLAGE ; MICROBIAL BIOMASS ; FOREST SOILS ; STOICHIOMETRIC DECOMPOSITION |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/185604 |
专题 | 气候变化 |
作者单位 | 1.Pacific Northwest Natl Lab, Biol Sci Div, Richland, WA 99354 USA; 2.Dartmouth Coll, Dept Biol Sci, Hanover, NH 03755 USA; 3.Oregon State Univ, Dept Crop & Soil Sci, Corvallis, OR 97331 USA |
推荐引用方式 GB/T 7714 | Bailey, Vanessa L.,Pries, Caitlin Hicks,Lajtha, Kate. What do we know about soil carbon destabilization?[J]. ENVIRONMENTAL RESEARCH LETTERS,2019,14(8). |
APA | Bailey, Vanessa L.,Pries, Caitlin Hicks,&Lajtha, Kate.(2019).What do we know about soil carbon destabilization?.ENVIRONMENTAL RESEARCH LETTERS,14(8). |
MLA | Bailey, Vanessa L.,et al."What do we know about soil carbon destabilization?".ENVIRONMENTAL RESEARCH LETTERS 14.8(2019). |
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