Whole-soil-profile warming does not change microbial carbon use efficiency in surface and deep soils.
In: Proceedings of the National Academy of Sciences of USA, Jg. 120 (2023-08-08), Heft 32
academicJournal
Zugriff:
The paucity of investigations of carbon (C) dynamics through the soil profile with warming makes it challenging to evaluate the terrestrial C feedback to climate change. Soil microbes are important engines driving terrestrial biogeochemical cycles; their carbon use efficiency (CUE), defined as the proportion of metabolized organic C allocated to microbial biomass, is a key regulator controlling the fate of soil C. It has been theorized that microbial CUE should decline with warming; however, empirical evidence for this response is scarce, and data from deeper soils are particularly scarce. Here, based on soil samples from a whole-soil-profile warming experiment (0 to 1 m, +4 °C) and 18O tracing approach, we examined the vertical variation of microbial CUE and its response to ~3.3-y experimental warming in an alpine grassland on the Qinghai-Tibetan Plateau. Microbial CUE decreased with soil depth, a trend that was primarily controlled by soil C availability. However, warming had limited effects on microbial CUE regardless of soil depth. Similarly, warming had no significant effect on soil C availability, as characterized by extractable organic C, enzyme-based lignocellulose index, and lignin phenol-based ratios of vanillyls, syringyls, and cinnamyls. Collectively, our work suggests that short-term warming does not alter microbial CUE in either surface or deep soils, and emphasizes the regulatory role of soil C availability on microbial CUE.
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Whole-soil-profile warming does not change microbial carbon use efficiency in surface and deep soils.
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Autor/in / Beteiligte Person: | Zhang, Qiufang ; Qin, Wenkuan ; Feng, Jiguang ; Li, Xiaojie ; Zhang, Zhenhua ; He, Jin-Sheng ; Zhu, Biao ; Schimel, Josh |
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Zeitschrift: | Proceedings of the National Academy of Sciences of USA, Jg. 120 (2023-08-08), Heft 32 |
Veröffentlichung: | eScholarship, University of California, 2023 |
Medientyp: | academicJournal |
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