Water level regulates the rhizosphere priming effect on SOM decomposition of peatland soil

Yan, Wenchao; Wang, Yuanyun; Ju, Peijun; Huang, Xinya; Chen, Huai

doi:10.1016/j.rhisph.2021.100455

Cited by 10 publications

(15 citation statements)

References 53 publications

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“…In our experiment, the WT difference of 20 cm was high enough to affect the CO 2 production as was also found by Yan et al. (2022). Some other studies have reported minimal or no change in CO 2 production following WT lowering, appointing this to lack of easily oxidizable OM (Ellis et al., 2009; Updegraff et al., 2001).…”

Section: Discussionsupporting

confidence: 85%

“…(2022). It must also be noted that the priming effect is a complex phenomenon (Fontaine et al., 2003) and results still vary on to what extent it exists (e.g., Linkosalmi et al., 2015; Walker et al., 2016; Yan et al., 2022).…”

Section: Discussionmentioning

confidence: 99%

“…In peatlands, WT level has been shown to affect rhizosphere priming: positive priming appeared at −40 cm WT level and negative at −20 cm (Yan et al, 2022). Given that a previous study determined that peatland fertility classes did not seem to affect the possibility of priming (Linkosalmi et al, 2015) and that WT depths in our study were −30 and −10 cm, it could be speculated that lack of positive priming was caused by relatively higher WT levels in our study compared with Yan et al (2022). It must also be noted that the priming effect is a complex phenomenon (Fontaine et al, 2003) and results still vary on to what extent it exists (e.g., Linkosalmi et al, 2015;Walker et al, 2016;Yan et al, 2022).…”

Section: Discussionmentioning

confidence: 99%

“…For example, Yan et al. (2022) and Gavazov et al. (2018) studied root‐induced priming on pristine peatlands, showing a positive priming effect on peat decomposition.…”

Section: Introductionmentioning

confidence: 99%

“…The majority of priming experiments so far have been conducted in mineral soils and not much is known about the priming effect on peatlands (Basiliko et al, 2012), though recent years have shown an increase in these studies (Basiliko et al, 2012;Gavazov et al, 2018;Linkosalmi et al, 2015;Waldo et al, 2021). For example, Yan et al (2022) and Gavazov et al (2018) studied rootinduced priming on pristine peatlands, showing a positive priming effect on peat decomposition. Further, Waldo et al (2021) reported selective positive priming of C compounds in the peat of a bog.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

The effects of glucose addition and water table manipulation on peat quality of drained peatland forests with different management practices

Aaltonen

Zhu

Khatun

et al. 2022

Soil Science Soc of Amer J

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Section: Discussionsupporting

confidence: 85%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…For example, Yan et al. (2022) and Gavazov et al. (2018) studied root‐induced priming on pristine peatlands, showing a positive priming effect on peat decomposition.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The effects of glucose addition and water table manipulation on peat quality of drained peatland forests with different management practices

Aaltonen

Zhu

Khatun

et al. 2022

Soil Science Soc of Amer J

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Stronger negative priming effect and lower basal respiration rates in nutrient‐poor as compared to nutrient‐rich forestry‐drained peatland

Linkosalmi

Lohila

Biasi

2023

Rapid Comm Mass Spectrometry

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Rationale Land‐use changes, e.g., forestry drainage, modify the characteristics of peatland soil and affect the peatland carbon (C) balance. Peat soil nutrient status, related mainly to the original peatland type, also has an impact on the C balance after drainage, as observed earlier at the ecosystem scale for two forestry‐drained sites in Southern Finland. Here the aim was to compare the soil CO2 fluxes from the two sites, nutrient‐poor and nutirent‐rich forestry‐drained peatlands, and study the effect of plant photosynthates on the decomposition of peat C. Therefore, the respiration rates and priming effect (PE) of peat soils with variable nutrient status were examined in the laboratory. Methods Half of the samples were labelled with 13C‐glucose to study the effect of fresh C addition on the soil decomposition. The 13CO2‐samples were analysed with isotope ratio mass spectrometry. A two‐pool mixing model was applied to separate the soil‐ and sugar‐derived respirations and to determine the PE. Results The nutrient‐rich peat soil respired generally more than the nutrient‐poor peat. A negative PE was observed in both peat soils, suggesting that the addition of fresh C did not increase the soil decomposition, but on the contrary decreased it. The negative PE was significantly more pronounced in nutrient‐poor peat soil than in the nutrient‐rich peat treatments, suggesting that the higher nutrient availability suppresses the negative PE. Conclusions These results imply that microbes prefer utilizing fresh C instead of old C in the short term and that the peat decomposition is suppressed in the presence of fresh C inputs from vegetation at forestry‐drained peatlands. These effects are even stronger in peat soils with less nutrients available. Ecosystem scale and soil process models could be improved with the help of these results.

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The impacts of land‐use and climate change on the Zoige peatland carbon cycle: A review

Gaffney,

Tang,

et al. 2023

WIREs Climate Change

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The Zoige peatlands are the largest peatland area in China, and the largest high‐altitude peatland in the world. As with many peatlands worldwide, degradation from land management and climate change mean that the intact Zoige peatland area has decreased, potentially reducing the carbon (C) sink function and ecosystem services. This review summarizes current knowledge of the impacts of land‐use and climate change on the Zoige peatland C cycle in a global perspective and identifies future research and management directions. The existing literature suggests that artificial drainage carried out to lower water tables and improve grazing has a significant impact on the peatland C cycle. Drained and degraded areas may act as a net C source, through increased CO2 emissions, although the overall C balance of the Zoige peatlands is likely still a net C sink. Future climate change may also impact upon the peatland C cycle. Warming of 2°C may significantly reduce the strength of the C sink of intact peatland areas, which may shift the overall Zoige peatland C cycle balance to a net C source. The effect of warming on degraded Zoige peatlands is a major uncertainty, although the global literature suggests warming effects may be greater in degraded peatlands. Restoration of degraded peatlands (by blocking drains) may help reverse some of the impacts of degradation and gradually recover C sink function. However, there are fewer studies in Zoige peatlands than elsewhere. We conclude with several specific suggestions for future research on the peatland C cycle.This article is categorized under: Paleoclimates and Current Trends > Modern Climate Change Assessing Impacts of Climate Change > Observed Impacts of Climate Change Climate, Ecology, and Conservation > Observed Ecological Changes

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Water level regulates the rhizosphere priming effect on SOM decomposition of peatland soil

Cited by 10 publications

References 53 publications

The effects of glucose addition and water table manipulation on peat quality of drained peatland forests with different management practices

The effects of glucose addition and water table manipulation on peat quality of drained peatland forests with different management practices

Stronger negative priming effect and lower basal respiration rates in nutrient‐poor as compared to nutrient‐rich forestry‐drained peatland

The impacts of land‐use and climate change on the Zoige peatland carbon cycle: A review

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