LiGeHuangEtAl2020

Référence

Li, T., Ge, L., Huang, J., Yuan, X., Peng, C., Wang, S., Bu, Z., Zhu, Q., Wang, Z., Liu, W., Wang, M. (2020) Contrasting responses of soil exoenzymatic interactions and the dissociated carbon transformation to short- and long-term drainage in a minerotrophic peatland. Geoderma, 377. (Scopus )

Résumé

Lowering of water table owing to climate warming and drainage has threatened the large reservoir of the preserved carbon (C) in peatlands. However, the consequent effects on northern nutrient-deficient peatlands are still under-investigated. Here, we compared a short- (42 days) with a long-term (30 years) drainage experiment, and quantified the activities of the decomposition-related extracellular enzymes as well as C, nitrogen (N) and phosphorus (P) stoichiometries in a minerotrophic peatland in northeastern China. The results showed that the key hydrolytic enzymatic activities increased by 2–145% and 25–465% under short- and long-term drainage respectively, but the preserved nutrients and C in the peat did not vary considerably. The minerotrophic peatland seems to be a complex adaptive system with great resilience to tackle the short- and long-term drainage with two disparate mechanisms. Specifically, the intrinsic nature of severe nutrient-deficiency may weaken enzymatic constraints on decomposition (the ‘enzymatic latch’ mechanism) during the short-term drainage. In contrast, the increases in phenolics input and litter quality due to the shift in vegetation composition may alleviate the threat to C stores during the long-term drainage. These distinct regulatory mechanisms over the course of progressive lowering of water table may potentially provide new insights to assess the risk and benefit of drainage in peatlands. © 2020 Elsevier B.V.

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@ARTICLE { LiGeHuangEtAl2020,
    AUTHOR = { Li, T. and Ge, L. and Huang, J. and Yuan, X. and Peng, C. and Wang, S. and Bu, Z. and Zhu, Q. and Wang, Z. and Liu, W. and Wang, M. },
    JOURNAL = { Geoderma },
    TITLE = { Contrasting responses of soil exoenzymatic interactions and the dissociated carbon transformation to short- and long-term drainage in a minerotrophic peatland },
    YEAR = { 2020 },
    NOTE = { cited By 0 },
    VOLUME = { 377 },
    ABSTRACT = { Lowering of water table owing to climate warming and drainage has threatened the large reservoir of the preserved carbon (C) in peatlands. However, the consequent effects on northern nutrient-deficient peatlands are still under-investigated. Here, we compared a short- (42 days) with a long-term (30 years) drainage experiment, and quantified the activities of the decomposition-related extracellular enzymes as well as C, nitrogen (N) and phosphorus (P) stoichiometries in a minerotrophic peatland in northeastern China. The results showed that the key hydrolytic enzymatic activities increased by 2–145% and 25–465% under short- and long-term drainage respectively, but the preserved nutrients and C in the peat did not vary considerably. The minerotrophic peatland seems to be a complex adaptive system with great resilience to tackle the short- and long-term drainage with two disparate mechanisms. Specifically, the intrinsic nature of severe nutrient-deficiency may weaken enzymatic constraints on decomposition (the ‘enzymatic latch’ mechanism) during the short-term drainage. In contrast, the increases in phenolics input and litter quality due to the shift in vegetation composition may alleviate the threat to C stores during the long-term drainage. These distinct regulatory mechanisms over the course of progressive lowering of water table may potentially provide new insights to assess the risk and benefit of drainage in peatlands. © 2020 Elsevier B.V. },
    AFFILIATION = { Center for Ecological Forecasting and Global Change, College of Forestry, Northwest A&F University, Yangling, Shaanxi 712100, China; State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, Institute for Peat and Mire Research, Northeast Normal University, Changchun, Jilin 130024, China; Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains, Ministry of Education, School of Geographical Sciences, Northeast Normal University130024, China; Jilin Provincial Key Laboratory for Wetland Ecological Processes and Environmental Change in the Changbai Mountains, Changchun, Jilin 130024, China; Department of Biology Sciences, Institute of Environment Sciences, University of Quebec at Montreal, P.O. Box 8888, Station Centre-Ville, Montreal, QC H3C 3P8, Canada; College of Hydrology and Water Resources, Hohai University, Nanjing, Jiangsu 210098, China },
    ART_NUMBER = { 114585 },
    AUTHOR_KEYWORDS = { Decomposition; Drainage; Enzymatic latch; Enzyme activity; Peat },
    DOCUMENT_TYPE = { Article },
    DOI = { 10.1016/j.geoderma.2020.114585 },
    SOURCE = { Scopus },
    URL = { https://www.scopus.com/inward/record.uri?eid=2-s2.0-85088393195&doi=10.1016%2fj.geoderma.2020.114585&partnerID=40&md5=accf5c1e9560a5142558a90874424bc9 },
}

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