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Effects of nitrogen addition on soil oxidisable organic carbon fractions in the rhizospheric and bulk soils of Chinese pines in north-western China
Liu, Hongfei1; Xue, Sha1,2; Wang, Guoliang1,2; Liu, Guobin
2018
Source PublicationSOIL RESEARCH
ISSN1838-675X
Volume56Issue:4Pages:192-203
AbstractIncreased atmospheric nitrogen (N) deposition caused by human activities has potentially important effects on ecosystem carbon (C) dynamics and different effects on C fractions with different stabilities and chemical compositions. A better understanding of the responses of different C fractions to N addition is vital for maintaining soil quality and protecting vegetation. In order to investigate the differential effects of N addition on total soil organic carbon (SOC) and four SOC fractions with increasing degrees of oxidisability in Pinus tabuliformis rhizospheric and bulk soils, a 6-year pot experiment was performed testing the effects of the addition of N at rates of 2.8, 5.6, 11.2, 22.4 and 44.8 g m(-2) year(-1) compared with a control (CK) group (no N addition). Addition of N addition had significant (P < 0.05) effects on SOC fractions of very labile C (C1) and recalcitrant C (C4), but negligible effects on total SOC (TOC) and SOC fractions of labile C (C2) and less labile C (C3). The C1 content and ratio of C1 to TOC in rhizospheres decreased following the addition of low levels (N2.8-N5.6) of N, but increased after the addition of high levels (N11.2-N44.8) of N, with minimum values obtained after the addition of 11.2N g m(-2) year(-1). Low rates (N2.8-N5.6) of N addition considerably increased C4 and the ratio of C4 to TOC in the rhizosphere, whereas addition of high rates (N11.2-N44.8) of N decreased these parameters. The responses of C1 and C4 in the bulk soil to N addition were opposite. The SOC fraction was significantly higher in the rhizosphere than in the bulk soil, indicating large rhizospheric effects. However, increased N addition weakened these effects. These findings suggest that low rates (N2.8-N5.6) of N addition stabilise SOC against chemical and biological degradation, whereas increased rates of N addition increase the lability of SOC in the bulk soil. Thus, the rhizosphere plays a vital role in soil carbon stability and sequestration in response to N addition.
KeywordPinus tabuliformis rhizosphere nitrogen deposition carbon stabilization
DOI10.1071/SR16358
WOS KeywordMICROBIAL COMMUNITY ; TEMPERATE FOREST ; ARCTIC TUNDRA ; DEPOSITION ; PLANT ; ECOSYSTEM ; DECOMPOSITION ; STORAGE ; LITTER ; DYNAMICS
Indexed BySCI
Language英语
Funding ProjectNational Science Foundation of China[41771557] ; National Science Foundation of China[41371508] ; National Science Foundation of China[41471438] ; National Science Foundation of China[41671513] ; Chinese Academy of Sciences[XAB2015A05]
Funding OrganizationNational Science Foundation of China ; Chinese Academy of Sciences
WOS Research AreaAgriculture
WOS SubjectSoil Science
WOS IDWOS:000433254100012
PublisherCSIRO PUBLISHING
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/54825
Collection中国科学院地理科学与资源研究所
Affiliation1.Northwest A&F Univ, Coll Forestry, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China
2.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China
Recommended Citation
GB/T 7714
Liu, Hongfei,Xue, Sha,Wang, Guoliang,et al. Effects of nitrogen addition on soil oxidisable organic carbon fractions in the rhizospheric and bulk soils of Chinese pines in north-western China[J]. SOIL RESEARCH,2018,56(4):192-203.
APA Liu, Hongfei,Xue, Sha,Wang, Guoliang,&Liu, Guobin.(2018).Effects of nitrogen addition on soil oxidisable organic carbon fractions in the rhizospheric and bulk soils of Chinese pines in north-western China.SOIL RESEARCH,56(4),192-203.
MLA Liu, Hongfei,et al."Effects of nitrogen addition on soil oxidisable organic carbon fractions in the rhizospheric and bulk soils of Chinese pines in north-western China".SOIL RESEARCH 56.4(2018):192-203.
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