Higher temperature accelerates carbon cycling in a temperate montane forest without decreasing soil carbon stocks

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dc.citation.volume39
dc.contributor.authorSiregar IH
dc.contributor.authorCamps-Arbestain M
dc.contributor.authorWang T
dc.contributor.authorKirschbaum MUF
dc.contributor.authorKereszturi G
dc.contributor.authorPalmer A
dc.date.accessioned2024-12-02T22:20:54Z
dc.date.available2024-12-02T22:20:54Z
dc.date.issued2024-11-09
dc.description.abstractGlobal warming is expected to accelerate the cycling of soil organic carbon (SOC) and the assimilation of new carbon, but the net effect of those counteracting accelerations and their ultimate effects on SOC are still uncertain. This hinders the prediction of long-term changes in biospheric carbon stocks and SOC-climate feedbacks. Here, we studied the long-term effect of temperature on carbon cycling across a 3.2 °C altitudinal temperature gradient in a temperate forest ecosystem in New Zealand. Across the gradient, soil respiration rates increased with increasing temperature from 9.0 to 10.4 tC ha−1 yr−1, but SOC stocks down to 85 cm depth also tended to increase, from 154 to 176 tC ha−1, albeit non-significantly (P = 0.06). This system was able to maintain higher soil respiration rates at higher temperatures without reducing SOC because the higher respiration rates were sustained by higher litterfall rates. Aboveground litterfall increased from 1.8 to 2.4 tC ha−1 yr−1 and estimated belowground C inputs increased from 7.2 to 8.0 tC ha−1 yr−1 along the temperature gradient. These higher fluxes were associated with significantly (P < 0.05) increased biomass at higher temperatures. As a direct measure of the effect of temperature on carbon cycling processes, we also calculated the turnover rate of forest litter which increased about 1.4-fold across the temperature gradient. This study demonstrates that higher temperatures along the thermal gradient increased plant carbon inputs through enhanced gross primary production, which counteracted SOC losses through temperature-enhanced soil respiration. These results suggest that temperature sensitivities of both plant carbon inputs and SOC losses must be considered for predicting SOC-climate feedbacks.
dc.description.confidentialfalse
dc.edition.editionDecember 2024
dc.identifier.citationSiregar IH, Camps-Arbestain M, Wang T, Kirschbaum MUF, Kereszturi G, Palmer A. (2024). Higher temperature accelerates carbon cycling in a temperate montane forest without decreasing soil carbon stocks. Geoderma Regional. 39.
dc.identifier.doi10.1016/j.geodrs.2024.e00889
dc.identifier.elements-typejournal-article
dc.identifier.issn2352-0094
dc.identifier.numbere00889
dc.identifier.urihttps://mro.massey.ac.nz/handle/10179/72151
dc.languageEnglish
dc.publisherElsevier B.V.
dc.publisher.urihttps://www.sciencedirect.com/science/article/pii/S2352009424001366
dc.relation.isPartOfGeoderma Regional
dc.rights(c) The author/sen
dc.rights.licenseCC BYen
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en
dc.subjectEcosystem warming
dc.subjectTemperate forest
dc.subjectSoil carbon
dc.subjectNet primary productivity
dc.subjectAndosol
dc.subjectGlobal change
dc.titleHigher temperature accelerates carbon cycling in a temperate montane forest without decreasing soil carbon stocks
dc.typeJournal article
pubs.elements-id492363
pubs.organisational-groupOther
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