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Anthropogenic Nitrogen Deposition Increases Soil Carbon by Enhancing New Carbon of the Soil Aggregate Formation
Chang, Ruiying1; Zhou, Wenjun2; Fang, Yunting3; Bing, Haijian1; Sun, Xiangyang1; Wang, Genxu1
Corresponding AuthorWang, Genxu(
Contribution Rank1
AbstractAnthropogenic nitrogen (N) deposition can most likely increase temperate forest soil organic carbon (SOC) storage. Increased SOC is usually suggested to be associated with the suppression of SOC decomposition, which has been hypothesized to be due to the decrease in the activity of lignin-degrading extracellular enzymes and/or the decrease in soil acidity under N addition. However, the potential mechanism of SOC protection derived from N addition is less understood. Here in a low-deposition temperate montane forest, short-term N addition could increase SOC storage in the aggregate fraction but not in the bulk soil. N-induced SOC accumulation was partly associated with the suppressed SOC decomposition (indicated by lower soil respiration) that resulted from the reduced microbial biomass rather than from decreased lignin-degrading enzyme activity or from reduced soil acidity. In addition, N addition promoted soil aggregate formation, which could partly suppress SOC decomposition by protecting new carbon that originated from plant litter residue to a greater degree, while dissolved organic carbon retention in the mineral soils played a limited role in the SOC sequestration derived from N addition, at least in the short term. A conceptual model was proposed and highlighted a new underlying mechanism of new carbon protection by enhanced aggregate formation, other than the role of microbial suppression, to explain the positive effect of anthropogenic N deposition on forest SOC. Plain Language Summary Since the industrial revolution, atmospheric active nitrogen (N) deposition has continued to increase worldwide due to human activities. N is considered as an essential element for ecosystem, and anthropogenic N deposition has been found to influence many aspects of forest ecosystems, such as soil acidity, the fate, cycle, and storage of soil carbon (C). It is very important to understand the changes in forest soil C and the potential mechanisms as forest soil holds a large C storage and plays a significant role in global C cycle and global warming. However, the direct, extent, and mechanism of the effects of N deposition on forest carbon are still unclear. Based on an experimental N-addition treatment conducted in a montane forest, we found that short-term N addition could increase soil storage in the aggregate fraction but not in the bulk soil. The N-induced aggregate C accumulation is associated with the enhanced soil aggregate formation inducing by N addition. Greater aggregate formation could protect greater C in the aggregate from microbial decomposition. This result presents a new conceptual framework regarding interactions between C and N cycling and provides a new insight in the effect of N deposition on soil structure and dynamic of carbon.
KeywordN addition montane forest DOC retention aggregate fractionation new carbon
Indexed BySCI
Funding ProjectNational Key Research and Development Program of China[2016YFC0502105] ; Key Research Program of Frontier Sciences, CAS[QYZDJ-SSW-DQC006] ; CAS 135 Strategic Program[SDS-135-1702] ; CAS 135 Strategic Program[2017XTBG-F01] ; Youth Innovation Promotion Association CAS[2018406] ; Natural Science Foundation of China[41301219]
WOS Research AreaEnvironmental Sciences & Ecology ; Geology
WOS SubjectEnvironmental Sciences ; Geosciences, Multidisciplinary
WOS IDWOS:000464653200009
Funding OrganizationNational Key Research and Development Program of China ; Key Research Program of Frontier Sciences, CAS ; CAS 135 Strategic Program ; Youth Innovation Promotion Association CAS ; Natural Science Foundation of China
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Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorWang, Genxu
Affiliation1.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Environm Evolvement & Regulat, Chengdu, Sichuan, Peoples R China;
2.Chinese Acad Sci, CAS Key Lab Trop Forest Ecol, Xishuangbanna Trop Bot Garden, Mengla, Peoples R China;
3.Chinese Acad Sci, Inst Appl Ecol, Shenyang, Liaoning, Peoples R China
Recommended Citation
GB/T 7714
Chang, Ruiying,Zhou, Wenjun,Fang, Yunting,et al. Anthropogenic Nitrogen Deposition Increases Soil Carbon by Enhancing New Carbon of the Soil Aggregate Formation[J]. JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,2019,124(3):572-584.
APA Chang, Ruiying,Zhou, Wenjun,Fang, Yunting,Bing, Haijian,Sun, Xiangyang,&Wang, Genxu.(2019).Anthropogenic Nitrogen Deposition Increases Soil Carbon by Enhancing New Carbon of the Soil Aggregate Formation.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,124(3),572-584.
MLA Chang, Ruiying,et al."Anthropogenic Nitrogen Deposition Increases Soil Carbon by Enhancing New Carbon of the Soil Aggregate Formation".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 124.3(2019):572-584.
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