Contrasting responses of soil exoenzymatic interactions and the dissociated carbon transformation to short- and long-term drainage in a minerotrophic peatland

Li, Tong; Ge, Leming; Huang, Jingjing; Yuan, Xin; Peng, Changhui; Wang, Shengzhong; Bu, Zhao‐Jun; Zhu, Qiuan; Wang, Zucheng; Liu, Weiguo; Wang, Meng

doi:10.1016/j.geoderma.2020.114585

Cited by 11 publications

(5 citation statements)

References 42 publications

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“…In contrast, extreme drought did not affect C-acquisition hydrolase (AG, BG, BX, and CB) or N-acquisition hydrolase (NAG and LAP) activities. The significant increase in soil oxidoreductase activity typically involved in recalcitrant C turnover under late drought in this study is in line with many studies (Li et al, 2020 ; Su et al, 2020 ) that have found that drought accelerated the degradation and C loss of peatlands (Zeng et al, 2021 ).…”

Section: Discussionsupporting

confidence: 92%

Plant and Soil Enzyme Activities Regulate CO2 Efflux in Alpine Peatlands After 5 Years of Simulated Extreme Drought

et al. 2021

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Increasing attention has been given to the impact of extreme drought stress on ecosystem ecological processes. Ecosystem respiration (Re) and soil respiration (Rs) play a significant role in the regulation of the carbon (C) balance because they are two of the largest terrestrial C fluxes in the atmosphere. However, the responses of Re and Rs to extreme drought in alpine regions are still unclear, particularly with respect to the driver mechanism in plant and soil extracellular enzyme activities. In this study, we imposed three periods of extreme drought events based on field experiments on an alpine peatland: (1) early drought, in which the early stage of plant growth occurred from June 18 to July 20; (2) midterm drought, in which the peak growth period occurred from July 20 to August 23; and (3) late drought, in which the wilting period of plants occurred from August 23 to September 25. After 5 years of continuous extreme drought events, Re exhibited a consistent decreasing trend under the three periods of extreme drought, while Rs exhibited a non-significant decreasing trend in the early and midterm drought but increased significantly by 58.48% (p < 0.05) during the late drought compared with the ambient control. Plant coverage significantly increased by 79.3% (p < 0.05) in the early drought, and standing biomass significantly decreased by 18.33% (p < 0.05) in the midterm drought. Alkaline phosphatase, polyphenol oxidase, and peroxidase increased significantly by 76.46, 77.66, and 109.60% (p < 0.05), respectively, under late drought. Structural equation models demonstrated that soil water content (SWC), pH, plant coverage, plant standing biomass, soil β-D-cellobiosidase, and β-1,4-N-acetyl-glucosaminidase were crucial impact factors that eventually led to a decreasing trend in Re, and SWC, pH, β-1,4-glucosidase (BG), β-1,4-xylosidase (BX), polyphenol oxidase, soil organic carbon, microbial biomass carbon, and dissolved organic carbon were crucial impact factors that resulted in changes in Rs. Our results emphasize the key roles of plant and soil extracellular enzyme activities in regulating the different responses of Re and Rs under extreme drought events occurring at different plant growth stages.

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Section: Discussionsupporting

confidence: 92%

Plant and Soil Enzyme Activities Regulate CO2 Efflux in Alpine Peatlands After 5 Years of Simulated Extreme Drought

et al. 2021

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“…In a parallel study of the BJH peatland, the phenol oxidase activity did increase in the drained area, but the hydrolytic activity of organic C decreased, not totally confirming the idea of ‘enzyme latch’ (Xu, Wang, et al, 2021). In another study, Li et al (2020) conducted microcosm experiments on peat cores extracted from the BJH peatland to investigate the effects of drainage. They observed enhanced enzyme activities after drainage; however, organic C levels did not change significantly in the porewater, nor did enzyme activities correlate to organic C transformation (Li et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

“…In another study, Li et al (2020) conducted microcosm experiments on peat cores extracted from the BJH peatland to investigate the effects of drainage. They observed enhanced enzyme activities after drainage; however, organic C levels did not change significantly in the porewater, nor did enzyme activities correlate to organic C transformation (Li et al, 2020). Together, these results suggest that enzyme activities alone were not adequate to explain the effects of drainage on DOC in the BJH peatland, and other mechanisms must be at play.…”

Section: Discussionmentioning

confidence: 99%

“…The coefficients of the spearman correlation between dissolved organic C (DOC) concentration, DOC quality, and physiochemical parameters. Only significant (p < 0.05) correlations were recorded and blanks represent insignificant correlations activities correlate to organic C transformation (Li et al, 2020).…”

Section: Relationship Between Environmental Conditions and Doc Concen...mentioning

confidence: 99%

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The effects of long‐term drainage and short‐term restoration on dissolved organic C concentrations and optical properties in the Baijianghe Peatland

Wei

Wang

et al. 2022

Hydrological Processes

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Peatlands are important reservoirs of terrestrial carbon (C), whose fate can have implications for the global C cycle and climate change. Many peatlands around the world have been drained for agriculture and forestry and restored later on hoping to reduce C emissions and improve water quality. However, the actual effects of these management practices remain unclear. To address this, we investigated the concentration and quality of dissolved organic C (DOC) and water chemistry (nutrient and Fe concentrations) in the surface water (creeks and ditches) of the natural, drained, and restored areas along an elevation gradient of the Baijianghe (BJH) peatland in northeast China from 2017 to 2020. We found significantly higher DOC concentrations in the natural than the drained area, with a heavier, more fulvic, and less aromatic DOC composition upslope, but the difference in DOC quality became smaller downslope. Restoration, on the other hand, did not bring DOC concentrations or quality back to the natural conditions within 2 years. These variations in DOC concentration and quality were closely associated with dissolved Fe concentration, highlighting the role of the Fe redox cycle, as Fe(II) can catalyse phenol oxidation activities and promote DOC production. Vegetation also affected DOC characteristics, as the drained and restored areas were dominated by shrubs with woodier tissues, which probably released less in amount but more recalcitrant DOC. Our study features rare side‐by‐side comparisons between pristine, drained, and restored areas of the same peatland, and sheds light on factors affecting peatland DOC under different management practices.

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“…Mori's meta-analysis found that the addition of P to a P limited ecosystem will meet the microbial demand for P, leading to a boom of microorganisms [22]. Li's study showed that P addition can stimulate soil enzyme activities, which will promote peat decomposition and accelerate the cycling of C and N, thereby providing energy and substrates for nitrifying and denitrifying microorganisms, and promoting N 2 O emissions in boreal peatlands [7,23].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Warming-Amplified Phosphorus Addition on a Peatland’s N2O Emissions

Yi,

Lu,

Chen

et al. 2023

Agronomy

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Natural montane peatlands are generally not a significant source of nitrous oxide (N2O) due to environment limitations, including phosphorus (P) scarcity and temperature lowness. Phosphorus enrichment and warming caused by global change are altering these limitations, and are likely to increase the source function of N2O. However, the combined effects of P addition and warming on N2O fluxes and biotic/abiotic factors in peatlands are still uncertain. To address this, we investigated the long-term (12 yrs) effects of P addition (5 and 10 kg ha−1 yr−1) and its interaction with warming on N2O fluxes in a peatland. The results showed that although long-term P addition did not significantly affect the source/sink function of N2O in the peatland, it stimulated enzyme activities and promoted peat decomposition. However, warming amplified the effect of P addition to increase N2O emissions by stimulating enzyme activities and changing soil stoichiometry, so even turned the peatland into a significant source of N2O with an emission of approximate 100 g m−2 during the growing season. Our study suggests that P enrichment against the current background of global warming will enhance the possibility of strong N2O emissions in montane peatlands, which may increase the risk that global warming will be further aggravated.

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Contrasting responses of soil exoenzymatic interactions and the dissociated carbon transformation to short- and long-term drainage in a minerotrophic peatland

Cited by 11 publications

References 42 publications

Plant and Soil Enzyme Activities Regulate CO2 Efflux in Alpine Peatlands After 5 Years of Simulated Extreme Drought

Plant and Soil Enzyme Activities Regulate CO2 Efflux in Alpine Peatlands After 5 Years of Simulated Extreme Drought

The effects of long‐term drainage and short‐term restoration on dissolved organic C concentrations and optical properties in the Baijianghe Peatland

The Effect of Warming-Amplified Phosphorus Addition on a Peatland’s N2O Emissions

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