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- W3097098032 abstract "<p class="western" lang="en-GB">Peatland biological, physical and chemical properties change over time in response to the long-term water table position. Such changes complicate predicting the response of peatland carbon stocks to sustained drying. Here we use Eddy Covariance measurements of CO<sub>2</sub> exchange to study the effect of sustained water table lowering on peatland carbon dynamics. We compare measurements from a near-pristine peatland with those of a drying remnant, both raised bogs dominated by <em>Empodisma robustum</em> (Restionaceae), across two different time periods separated by a 16-year interval. We found that the remnant bog was initially a source of CO<sub>2 </sub>following water table lowering. However, the CO<sub>2</sub> sink recovered and strengthened after the 16-year interval between measurements. The increase in CO<sub>2 </sub>sink strength in the remnant bog was primarily due to increased photosynthetic uptake of CO<sub>2</sub>, which exceeded that of the near-pristine site in both time periods. Additionally we found the loss of CO<sub>2 </sub>via ecosystem respiration to have declined with time, however, ecosystem respiration remained elevated compared to the near-pristine site. These trends of increasing photosynthesis and declining ecosystem respiration resulted in the CO<sub>2 </sub>sink in the dry bog reaching half the sink strength of the near-pristine bog. We consider two factors to have been key for the recovery of the CO<sub>2</sub> sink in the remnant bog. These were 1) resilience of the peat-forming plant community to water-table change and 2) the expansion of ericoid shrubs. Our results demonstrate that the peatland carbon sink can recover from drying over a multi-decadal timescale, but questions remain as to the long-term trajectory of dry bogs and the stability of carbon fixed after water table lowering.</p>" @default.
- W3097098032 created "2020-11-09" @default.
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- W3097098032 date "2020-03-11" @default.
- W3097098032 modified "2023-09-25" @default.
- W3097098032 title "Long-term feedbacks result in the recovery of the CO2 sink in a remnant peatland following water table lowering" @default.
- W3097098032 doi "https://doi.org/10.5194/egusphere-egu2020-773" @default.
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