DengPengZhuEtAl2018

Référence

Deng, L., Peng, C., Zhu, G., Chen, L., Liu, Y. and Shangguan, Z. (2018) Positive responses of belowground C dynamics to nitrogen enrichment in China. Science of the Total Environment, 616-617:1035-1044. (Scopus )

Résumé

Determining how nitrogen (N) impacts ecosystem carbon (C) cycling is critical to using C sequestration to offset anthropogenic CO2 emissions. The N deposition rate in China is higher than the global average; however, many results of N enrichment experiments in China have not been included in global syntheses. In this study, we assembled a large dataset that comprised 124 published studies concerning N addition experiments, including 570 observations at 127 sites across China, to quantify the responses of belowground C dynamics to N enrichment in terrestrial ecosystems in China by a meta-analysis. The results showed that overall soil organic C, dissolved organic C (DOC) and soil microbial biomass C (MBC) increased by 1.8, 7.4, and 8.8%, respectively (P < 0.05), in response to N enrichment; belowground biomass and litter increased by 14.6 and 24.4%, respectively (P < 0.05); and soil respiration increased by 6.1% (P < 0.05). N enrichment promoted C inputs into the soil mainly by increasing litter and belowground biomass inputs. Additionally, N enrichment increased C output by increasing soil respiration. Land use type and N addition level had different impacts on the soil C pool and on soil respiration. DOC, MBC, and litter exhibited more positive responses to N deposition in cooler and more arid regions than in other regions. The meta-analysis indicated that N enrichment had a positive impact on belowground C cycles in China. Climate played a greater role than did N deposition level in affecting processes of ecosystem C cycling. Moreover, belowground C cycle processes are determined by complicated interactions among land use type, N enrichment, and climate. © 2017 Elsevier B.V.

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@ARTICLE { DengPengZhuEtAl2018,
    AUTHOR = { Deng, L. and Peng, C. and Zhu, G. and Chen, L. and Liu, Y. and Shangguan, Z. },
    TITLE = { Positive responses of belowground C dynamics to nitrogen enrichment in China },
    JOURNAL = { Science of the Total Environment },
    YEAR = { 2018 },
    VOLUME = { 616-617 },
    PAGES = { 1035-1044 },
    NOTE = { cited By 1 },
    ABSTRACT = { Determining how nitrogen (N) impacts ecosystem carbon (C) cycling is critical to using C sequestration to offset anthropogenic CO2 emissions. The N deposition rate in China is higher than the global average; however, many results of N enrichment experiments in China have not been included in global syntheses. In this study, we assembled a large dataset that comprised 124 published studies concerning N addition experiments, including 570 observations at 127 sites across China, to quantify the responses of belowground C dynamics to N enrichment in terrestrial ecosystems in China by a meta-analysis. The results showed that overall soil organic C, dissolved organic C (DOC) and soil microbial biomass C (MBC) increased by 1.8, 7.4, and 8.8%, respectively (P < 0.05), in response to N enrichment; belowground biomass and litter increased by 14.6 and 24.4%, respectively (P < 0.05); and soil respiration increased by 6.1% (P < 0.05). N enrichment promoted C inputs into the soil mainly by increasing litter and belowground biomass inputs. Additionally, N enrichment increased C output by increasing soil respiration. Land use type and N addition level had different impacts on the soil C pool and on soil respiration. DOC, MBC, and litter exhibited more positive responses to N deposition in cooler and more arid regions than in other regions. The meta-analysis indicated that N enrichment had a positive impact on belowground C cycles in China. Climate played a greater role than did N deposition level in affecting processes of ecosystem C cycling. Moreover, belowground C cycle processes are determined by complicated interactions among land use type, N enrichment, and climate. © 2017 Elsevier B.V. },
    AFFILIATION = { State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling, Shaanxi, China; Center of CEF/ESCER, Department of Biological Science, University of Quebec at Montreal, Montreal, Canada },
    AUTHOR_KEYWORDS = { Climate; Land use type; Meta-analysis; N addition; Soil carbon; Soil respiration },
    DOCUMENT_TYPE = { Article },
    DOI = { 10.1016/j.scitotenv.2017.10.215 },
    SOURCE = { Scopus },
    URL = { https://www.scopus.com/inward/record.uri?eid=2-s2.0-85032346625&doi=10.1016%2fj.scitotenv.2017.10.215&partnerID=40&md5=477eca6306ae1aea68d9988c99889f81 },
}

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