气候变化领域集成服务门户(CCPortal): Modeling Interactive Effects of Manganese Bioavailability, Nitrogen Deposition, and Warming on Soil Carbon Storage

CCPortal

DOI	10.1029/2023JG007830
	Modeling Interactive Effects of Manganese Bioavailability, Nitrogen Deposition, and Warming on Soil Carbon Storage
	Sulman, Benjamin N.; Herndon, Elizabeth M.
发表日期	2024
ISSN	2169-8953
EISSN	2169-8961
起始页码	129
结束页码	5
卷号	129 期号:5
英文摘要	Manganese (Mn) is a redox-active micronutrient that has been shown to accelerate plant litter decomposition; however, the effect of Mn-promoted decomposition on soil C storage is unclear. We present a novel biogeochemical model simulating how Mn bioavailability influences soil organic C (SOC) stocks in a soil profile (<50 cm) within a temperate forest. In our model, foliar Mn increased in response to increasing soluble Mn released through Mn-oxide (birnessite) dissolution in mineral soil layers. The ensuing Mn enrichment in leaf litter redistributed Mn to the surface forest floor layer, promoted enzymatic oxidation of lignin, and decreased SOC stocks. Total SOC loss was partially mitigated by accumulation of lignin-oxidation products as mineral-associated organic C. We also explored how Mn-driven changes to C storage interacted with effects of N deposition and warming. Nitrogen enrichment inhibited Mn-dependent lignin degradation, increasing SOC stocks and weakening their dependence on Mn bioavailability. Warming stimulated decomposition and reduced C stocks but was less effective at low Mn bioavailability. Our model results suggest that SOC stocks are sensitive to Mn bioavailability because increased plant uptake redistributes Mn to surface soils where it can enhance litter decomposition. Based on our simulations, we predict that Mn becomes limiting to litter decomposition where Mn is poorly soluble. Depletion of bioavailable Mn or other cofactors that are critical to decomposition could limit the response of organic C stocks to warming over time, but quantitative projections of the role of Mn bioavailability in regulating decomposition requires additional measurements to constrain model uncertainties.
英文关键词	soil organic carbon; manganese; nitrogen; climate change; biogeochemical modeling
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Geology
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary
WOS记录号	WOS:001228910500001
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/301324
作者单位	United States Department of Energy (DOE); Oak Ridge National Laboratory
推荐引用方式 GB/T 7714	Sulman, Benjamin N.,Herndon, Elizabeth M.. Modeling Interactive Effects of Manganese Bioavailability, Nitrogen Deposition, and Warming on Soil Carbon Storage[J],2024,129(5).
APA	Sulman, Benjamin N.,&Herndon, Elizabeth M..(2024).Modeling Interactive Effects of Manganese Bioavailability, Nitrogen Deposition, and Warming on Soil Carbon Storage.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,129(5).
MLA	Sulman, Benjamin N.,et al."Modeling Interactive Effects of Manganese Bioavailability, Nitrogen Deposition, and Warming on Soil Carbon Storage".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 129.5(2024).