The effects of hummock-hollow microtopography on soil organic carbon stocks and soil labile organic carbon fractions in a sedge peatland in Changbai Mountain, China

Wang, Ming; Wang, Shengzhong; Cao, Yingyue; Jiang, Ming; Wang, Guodong; Dong, Yanmin

doi:10.1016/j.catena.2021.105204

Cited by 32 publications

(25 citation statements)

References 71 publications

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“…The ratios of LOC fractions to OC can reflect the quality and turnover of soil OC (Huo et al 2013). According to Wang et al (2021a), an increase in the LOC/OC ratios was accompanied by a decrease in the OC availability in forest soil. In this study, soil LOC/OC ratios (including ROC/OC, POC/OC, MBC/ OC, WOC/OC, and MOC/OC ratios) first decreased and then increased over time, with the lowest levels observed in the 17-year-old fir plantations (Table 9), suggesting that the soil OC in the 17-year-old fir plantations experienced greater degradation.…”

Section: Soil Carbon Concentration As Affected By Stand Agementioning

confidence: 99%

Distribution of organic carbon fractions in soil aggregates in Chinese fir plantations with different stand ages

Huang

Zhang

et al. 2021

Ecol Process

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Background Revealing the variations in soil aggregate-related organic carbon (OC) and labile organic carbon (LOC) fractions in a chronosequence of Chinese fir plantations plays an important role in better understanding the impact of soil carbon sink or source on the Chinese fir plantation ecosystem. In this study, soil samples in a depth of 0–20 cm were collected from Chinese fir plantations at different stand ages (0, 9, 17, and 26 years old) in Guangxi, China. With the optimal moisture sieving method adopted, the soil aggregates of 4 different sizes were obtained, including > 2-mm, 2–1-mm, 1–0.25-mm, and < 0.25-mm aggregates. Soil OC and LOC fractions were measured in the aggregates of different sizes. The LOC fractions included readily oxidizable carbon (ROC), particulate organic carbon (POC), microbial biomass carbon (MBC), water-soluble organic carbon (WOC), and mineralized organic carbon (MOC). Results Soil aggregate stability, as indicated by the mean weight diameter (MWD), was the highest in the 17-year-old Chinese fir plantations and was significantly positively related (p < 0.05) to the concentrations of OC and LOC fractions (except for the ROC and MOC), with the POC in particular. As for all stand ages of Chinese fir plantations, the concentrations of soil OC and LOC fractions were significantly increased as the aggregate size decreased. Consequently, there were more OC and LOC fractions distributed in the < 0.25-mm aggregates. During the stand development, the concentrations of soil OC and LOC fractions first increased and then decreased, with the highest levels detected in the 17-year-old Chinese fir plantations, indicating that the 17-year-old Chinese fir plantations were conducive to the accumulation of soil OC and LOC fractions. Conclusion After 17 years of planting, promoted soil carbon (especially for the POC) accumulation contributes significantly to enhancing soil aggregate stability for the Chinese fir plantations in Guangxi, China.

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Section: Soil Carbon Concentration As Affected By Stand Agementioning

confidence: 99%

Distribution of organic carbon fractions in soil aggregates in Chinese fir plantations with different stand ages

Huang

Zhang

et al. 2021

Ecol Process

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“…Two out of five EEAs (NAG and SUL) showed significant difference in activities between hummock and lawns. Previous research has reported that drier hummocks had higher activity of NAG compared to wet lawns (Wang et al 2021). In addition, Xu et al (2021) reported that NAG activity was significantly higher in oxic zone of drained peat.…”

Section: Effects On Extracellular Enzyme Activitymentioning

confidence: 87%

Peatland plant functional type effects on decomposition factors are non-pervasive, but microhabitat dependent

Sahar

Robroek

Mills

et al. 2022

Preprint

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Despite their low primary production, ombrotrophic peatlands are important long-term sinks for atmospheric carbon due to even lower rates of litter decomposition. Litter decomposition can be affected by plant functional types (PFTs; Graminoids, Ericoids) and microhabitat (hummock, lawn), but the microhabitat context-dependency of PFT effects on decomposition processes remains poorly understood. We used a long-term (> 10 yr) plant removal experiment, in conjunction with the Tea Bag Index (TBI), to explore how PFT removal in both hummock and lawn microhabitats influence decomposition. In parallel, we assessed potential activity of five extracellular hydrolytic enzymes as proxies for microbial activity. Our results indicate that PFT removal had no effect on the TBI decomposition constant ( k ), nor on the stabilisation factor (S). Yet, k increased slightly when both PFTs were absent. In the lawns, we observed higher values of S as compared to hummocks. A similar trend was observed for the decomposition rate constant ( k ). PFT compostion influenced the potential hyrolytic EEAs underlying decomposition process, however this influence was non-pervasive and depended on microhabitat. Our results suggest an important role for vegetation change – through their influence on enzyme activity – along the lawn-hummock gradient in regulating decomposition processes in northern peatlands. Our results highlight it is important to monitor the interplay between plant functional type composition and microhabitat in order to understand decomposition processes in peatlands.

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“…Changbai Mountain is located in the northeast of China and is adjacent to the border between China and North Korea. Changbai Mountain is the highest mountain on the eastern edge of Eurasia, and it is vulnerable to climate change ( Wang et al, 2021 ; Zhao et al, 2021 ). The peatlands are widely distributed in the Changbai Mountains with an altitude of about 300 to 1,500 m. The total area of peatlands in this region is about 23,100 ha, of which 70% are sedge peatlands dominated by Carex species ( Bao et al, 2010 ; Wang et al, 2017 ).…”

Section: Methodsmentioning

confidence: 99%

“…The altitude gradient was supposed to be an ideal natural laboratory for studying climate change ( Siles et al, 2017 ). The peatlands along the altitude gradient are important ecosystems in the Changbai Mountain regain of China, and they are extremely sensitive to climate change ( Wang et al, 2021 ; Zhao et al, 2021 ). Therefore, we selected eight sedge-dominated peatlands along an altitude gradient in the Changbai Mountain to reveal the influence of the environmental changes along an altitude gradient on the concentrations and metabolic characteristics of methanotrophs in peatlands.…”

Section: Introductionmentioning

confidence: 99%

Variations in Concentration and Carbon Isotope Composition of Methanotroph Biomarkers in Sedge Peatlands Along the Altitude Gradient in the Changbai Mountain, China

et al. 2022

Self Cite

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Northern peatlands are one of the largest natural sources of atmospheric methane globally. As the only biological sink of methane, different groups of methanotrophs use different carbon sources. However, the variations in microbial biomass and metabolism of different methanotrophic groups in peatlands along the altitude gradient are uncertain. We measured the concentrations and metabolic characteristics of type I (16:1ω7c and 16:1ω5c) and type II (18:1ω7c) methanotroph biomarkers using biomarkers and stable isotopes in eight Carex peatlands along an altitude gradient from 300 to 1,500 m in the Changbai Mountain, China. We found that the trends with altitude in concentrations of the type I and type II methanotroph biomarkers were different. The dominating microbial group changed from type I to type II methanotroph with increasing altitude. The concentrations of type I and type II methanotroph biomarkers were significantly affected by the total phosphorus, total nitrogen, and dissolved organic carbon, respectively. The δ13C values of type II methanotroph biomarkers changed significantly along the altitude gradient, and they were more depleted than type II methanotroph biomarkers, which indicates the difference in carbon source preference between type I and type II methanotrophs. This study highlights the difference in the concentration and carbon source utilization of type I and type II methanotrophic groups along the altitude gradient, and enhances our understanding of the metabolic process of methane mediated by methanotrophs and its impact on carbon-sink function in northern peatlands.

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The effects of hummock-hollow microtopography on soil organic carbon stocks and soil labile organic carbon fractions in a sedge peatland in Changbai Mountain, China

Cited by 32 publications

References 71 publications

Distribution of organic carbon fractions in soil aggregates in Chinese fir plantations with different stand ages

Distribution of organic carbon fractions in soil aggregates in Chinese fir plantations with different stand ages

Peatland plant functional type effects on decomposition factors are non-pervasive, but microhabitat dependent

Variations in Concentration and Carbon Isotope Composition of Methanotroph Biomarkers in Sedge Peatlands Along the Altitude Gradient in the Changbai Mountain, China

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