Responses of soil respiration and its components to experimental warming in an alpine scrub ecosystem on the eastern Qinghai-Tibet Plateau.
In: Science of the Total Environment, Jg. 643 (2018-12-01), S. 1427-1435
Online
academicJournal
Zugriff:
Abstract The responses of soil respiration (R s ) to warming are driven by its components, that is, heterotrophic respiration (R h ) and rhizosphere respiration (R r , including fine root respiration [R fr ] and rhizomicrobial respiration [R z ]). However, the effects of warming on R s and its components are rarely studied in alpine scrub ecosystems on the Qinghai-Tibet Plateau. Here, we conducted a warming experiment to examine how R s and its components respond to experimental warming. We found that one–year experimental warming (increased by 1.3 °C) significantly stimulated the rates of R s , R h and R r by 21.6, 23.8, and 21.1%, respectively. The annual cumulative C effluxes of R s increased by 87.87 g m−2 with nearly equal contributions from R h (46.84 g m−2) and R r (41.03 g m−2) under warming. Moreover, warming-induced increase in R r mainly resulted from increased R fr rather than R z due to the significant increase in fine root biomass and R fr rate. In addition, the Q 10 values for R s , R h and R r were also increased by experimental warming, while the contribution of R h to R s was not altered by experimental warming. Collectively, our results suggest that future climatic warming will stimulate more C releases from soil to the atmosphere through an enhancement of both R h and R r in these alpine scrub ecosystems on the Qinghai-Tibet Plateau. Graphical abstract Unlabelled Image Highlights • Soil respiration components were studied in an alpine scrubland under warming. • Warming equally increased heterotrophic and rhizosphere respiration. • Enhanced rhizosphere respiration resulted from fine root respiration. • Warming did not significantly affect rhizomicrobial respiration. [ABSTRACT FROM AUTHOR]
Titel: |
Responses of soil respiration and its components to experimental warming in an alpine scrub ecosystem on the eastern Qinghai-Tibet Plateau.
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Autor/in / Beteiligte Person: | Ma, Zhiliang ; Zhao, Wenqiang ; Liu, Mei ; Liu, Qing |
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Zeitschrift: | Science of the Total Environment, Jg. 643 (2018-12-01), S. 1427-1435 |
Veröffentlichung: | 2018 |
Medientyp: | academicJournal |
ISSN: | 0048-9697 (print) |
DOI: | 10.1016/j.scitotenv.2018.06.243 |
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