气候变化领域集成服务门户(CCPortal): What do we know about soil carbon destabilization?

CCPortal

DOI	10.1088/1748-9326/ab2c11
	What do we know about soil carbon destabilization?
	Bailey V.L.; Pries C.H.; Lajtha K.
发表日期	2019
ISSN	17489318
卷号	14 期号:8
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. © 2019 The Author(s). Published by IOP Publishing Ltd.
英文关键词	bioavailability; Birch effect; destabilization; metabolism; physical occlusion; priming; soil organic carbon
语种	英语
scopus关键词	Aggregates; Biochemistry; Metabolism; Minerals; Organic carbon; Process control; Soils; Sols; Wetting; bioavailability; Birch effect; destabilization; physical occlusion; priming; Soil organic carbon; Stabilization; aggregate; bioavailability; desorption; dissolution; empirical analysis; freeze-thaw cycle; metabolism; mycorrhiza; organic carbon; reaction kinetics; soil carbon
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/154464
作者单位	Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, United States; Department of Biological Sciences, Dartmouth College, Hanover, NH, United States; Department of Crop and Soil Sciences, Oregon State University, Corvallis, OR, United States
推荐引用方式 GB/T 7714	Bailey V.L.,Pries C.H.,Lajtha K.. What do we know about soil carbon destabilization?[J],2019,14(8).
APA	Bailey V.L.,Pries C.H.,&Lajtha K..(2019).What do we know about soil carbon destabilization?.Environmental Research Letters,14(8).
MLA	Bailey V.L.,et al."What do we know about soil carbon destabilization?".Environmental Research Letters 14.8(2019).