The variability in CO2 fluxes at different time scales in natural and reclaimed wetlands in the Yangtze River estuary and their key influencing factors

Wang, Lei; Mei, Wenxuan; Yin, Qiuxiao; Guan, Yongjian; Le, Yiquan; Fu, Xiaohua

doi:10.1016/j.scitotenv.2021.149441

Cited by 13 publications

(9 citation statements)

References 48 publications

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“…The area of vegetation extends more than 70 km 2 and is mainly composed of mudflat-dominant plant communities such as Phragmites communis , Spartina alterniflora , and Scirpus mariqueter . 15 The Jiuduansha wetland is affected by marine and continental climate, and has an average annual temperature of 17.3°C, with the lowest temperature in January (average of 4.2°C) and highest temperature in July (average of 27.3°C). 18 A long-term geographical survey revealed that the vegetation type, soil type, flooding time, and salinity of the Yangtze River estuary wetlands have basically remained unchanged, while the water quality has shown improvement in recent years.…”

Section: Methodsmentioning

confidence: 99%

“…The zero point of the CO 2 concentration was calibrated with N 2 gas purified by a desiccant and sodium carbonate, and the range of the CO 2 concentration was calibrated with standard CO 2 gas (450 ppm; ±1%). 15 The maintenance frequency was once every 1–2 weeks on an average, and maintenance was also conducted after extreme weather events. The OPEC raw flux data were collected and stored on an industrial-grade flash memory card in a data collector, with a data recording frequency of 10 Hz.…”

Section: Methodsmentioning

confidence: 99%

“… 13 In particular, owing to its crucial role, the C sink function of the Yangtze River estuary wetlands, has attracted the attention of many scholars. Many studies have focused on the organic C accumulation capability and its influencing factors in the Yangtze River estuary wetlands, and found that the Yangtze River estuary wetland is a C sink, 14 , 15 and that C emissions and accumulation in the Yangtze River estuary wetlands are highly site-specific depending on factors such as salinity, plant type and productivity, and water table. 16 Some external disturbances, such as plant invasion, tidal water quality, siltation promotion, and so forth, can affect the wetland C sink capacity by altering the relative ratio of soil respiration (SR) release and plant growth input.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Preliminary manifestation of the Yangtze River Protection Strategy in improving the carbon sink function of estuary wetlands

Dong,

Hu,

Qian

et al. 2024

iScience

Self Cite

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Preliminary manifestation of the Yangtze River Protection Strategy in improving the carbon sink function of estuary wetlands

Dong,

Hu,

Qian

et al. 2024

iScience

Self Cite

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“…Therefore, plants play an important role in wetlands [19] in terms of both the carbon and nitrogen cycle. Plant carbon inputs increase the sediment organic carbon content [20,21], while nitrogen is the primary nutrient limiting plant growth [22,23], and nitrogen availability affects plant carbon inputs to sediments by limiting net primary production [15,24]. The input of plant litter can stimulate microbial activity, thereby increasing the content of available nitrogen in sediments [21,25,26].…”

Section: Introductionmentioning

confidence: 99%

Microorganisms Directly Affected Sediment Carbon–Nitrogen Coupling in Two Constructed Wetlands

Wang,

Fang,

et al. 2024

Water

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Clarifying the carbon–nitrogen coupling pattern in wetlands is crucial for understanding the driving mechanism of wetland carbon sequestration. However, the impacts of plants and environmental factors on the coupling of carbon–nitrogen in wetland sediments are still unclear. Sediment samples from plant (Typha angustifolia and Phragmites australis)-covered habitats and bare land were collected in two constructed wetlands in northern China. The contents of different forms of carbon and nitrogen in sediments and plants, and the sediment microbial community were detected. It was found that the sediment carbon to nitrogen (C/N) ratios did not differ significantly in the bare sites of different wetlands, but did in the plant-covered sites, which highlighted the different role of plants in shifting the carbon–nitrogen coupling in different constructed wetlands. The effects of plants on the sediment carbon–nitrogen coupling differed in two constructed wetlands, so the structural equation model was used and found that sediment microorganisms directly affected sediment C/N ratios, while water and sediment physicochemical properties indirectly affected sediment C/N ratios by altering sediment microbial functions. Multiple linear regression models showed that water pH, sediment moisture content, water dissolved oxygen, and water depth had a greater influence on the carbon metabolism potential of the sediment microbial community, while sediment moisture content had the greatest impact on the sediment microbial nitrogen metabolism potential. The study indicates that variations in environmental conditions could alter the influence of plants on the carbon and nitrogen cycles of wetland sediments. Water environmental factors mainly affect microbial carbon metabolism functions, while soil physicochemical factors, especially water content, affect microbial carbon and nitrogen metabolism functions.

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“…The changes in soil respiration and its 2 of 12 influencing factors must be determined for prediction of global climate change. Most studies have focused on undisturbed ecosystems, such as forests [10], grasslands [11], wetlands [12], deserts [13], and tundra [14], while ignoring the changes in the carbon cycle in these ecosystems in response to factors such as fire control [15], litter removal [16], clear-cutting [17], and nitrogen addition [18]. In particular, the carbon cycle of an ecosystem under disturbance is more complex and has practical significance, which needs much more attention.…”

Section: Introductionmentioning

confidence: 99%

Effects of Prescribed Burning on Soil CO2 Emissions from Pinus yunnanensis Forestland in Central Yunnan, China

et al. 2022

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The effects of low-intensity and high-frequency prescribed burning on the soil CO2 emissions from Pinus yunnanensis forestland should be explored to achieve sustainable operation and management under fire disturbance. A Li-6400XT portable photosynthesis meter (equipped with a Li-6400-09 soil respiration chamber) and a TRIME®-PICO 64/32 soil temperature and moisture meter were used to measure the soil CO2 flux, soil temperature, and soil moisture at fixed observation sites in two treatments (i.e., unburned (UB) and after prescribed burning (AB)) in a Pinus yunnanensis forest of Zhaobi Mountain, Xinping County, Yunnan, China from March 2019 to February 2021. We also determined the relationships between the soil CO2 flux and soil hydrothermal factors. The results showed that (1) the soil CO2 flux in both UB and AB plots exhibited a significant unimodal trend of seasonal variations. In 2020, the highest soil CO2 fluxes occurred in September; they were 7.08 μmol CO2·m−2·s−1 in the morning and 7.63 μmol CO2·m−2·s−1 in the afternoon in the AB treatment, which was significantly lower than those in the UB treatment (p < 0.05). The AB and the UB treatment showed no significant differences in annual soil carbon flux (p > 0.05). (2) The relationship between the soil CO2 flux and moisture in the AB and UB plots was best fitted by a quadratic function, with a degree of fitting between 0.435 and 0.753. The soil CO2 flux and soil moisture showed an inverted U-shaped correlation in the UB plot (p < 0.05) but a positive correlation in the AB plot (p < 0.05). Soil moisture was the key factor affecting the soil CO2 flux (p < 0.05), while soil temperature showed no significant effect on soil CO2 flux in this area (p > 0.05). Therefore, the application of low-intensity prescribed burning for fire hazard reduction in this region achieved the objective without causing a persistent and drastic increase in the soil CO2 emissions. The results could provide important theoretical support for scientific implementation of prescribed burning, as well as scientific evaluation of ecological and environmental effects after prescribed burning.

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The variability in CO2 fluxes at different time scales in natural and reclaimed wetlands in the Yangtze River estuary and their key influencing factors

Cited by 13 publications

References 48 publications

Preliminary manifestation of the Yangtze River Protection Strategy in improving the carbon sink function of estuary wetlands

Preliminary manifestation of the Yangtze River Protection Strategy in improving the carbon sink function of estuary wetlands

Microorganisms Directly Affected Sediment Carbon–Nitrogen Coupling in Two Constructed Wetlands

Effects of Prescribed Burning on Soil CO2 Emissions from Pinus yunnanensis Forestland in Central Yunnan, China

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