Predicting forested wetland soil carbon using quantitative color sensor measurements in the region of northern Virginia, USA

The long-term use of wetlands stresses wetland ecosystems and leads to degradation and C loss. This study explored an optimal remote sensing-multivariate linear regression model (RS-MLRM) for estimating wetland soil organic carbon (SOC) by using a combination of the measured SOC and above ground biomass (AGB) from 273 samples, textural features, spectral information, and a vegetation index calculated from Landsat-8 images using the Ningxia Basin of the Yellow River as the study area. To derive the optimal predictor model for SOC, these variables were regressed against the measured SOC. These were used to predict SOC and evaluate the contribution of wetland restoration and conservation projects to soil carbon sequestration and sinks on the Ningxia Basin of the Yellow River in early (2000 and 2005), intermediate (2010), and recent (2015) years. The results show that from 2000 to 2015, the project-induced contribution to C sequestration was 20.49 TC, with an annual sink of 1.37 TC. This accounted for 54.06% of the total wetland ecosystem C sequestration on the Ningxia Basin of the Yellow River. Moreover, there was a significant success of restoration and conservation projects regarding C sequestration. These restoration and conservation projects have substantially contributed to CO2 mitigation in the arid area.

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Exploring the oxygen sensitivity of wetland soil carbon mineralization

Biology Letters ◽

10.1098/rsbl.2018.0407 ◽

2019 ◽

Vol 15 (1) ◽

pp. 20180407 ◽

Cited By ~ 5

Author(s):

Samantha K. Chapman ◽

Matthew A. Hayes ◽

Brendan Kelly ◽

J. Adam Langley

Keyword(s):

Soil Carbon ◽

Coastal Wetlands ◽

Carbon Mineralization ◽

Oxygen Availability ◽

Blue Carbon ◽

Oxygen Sensitivity ◽

Wetland Soil ◽

Soil Oxygen ◽

Precise Understanding ◽

Wide Range

Soil oxygen availability may influence blue carbon, which is carbon stored in coastal wetlands, by controlling the decomposition of soil organic matter. We are beginning to quantify soil oxygen availability in wetlands, but we lack a precise understanding of how oxygen controls soil carbon dynamics. In this paper, we synthesize existing data from oxic and anoxic wetland soil incubations to determine how oxygen controls carbon mineralization. We define the oxygen sensitivity of carbon mineralization as the ratio of carbon mineralization rate in oxic soil to this rate in anoxic soil, such that higher values of this ratio indicate greater sensitivity of carbon mineralization to oxygen. The estimates of oxygen sensitivity we derived from existing literature show a wide range of ratios, from 0.8 to 33, across wetlands. We then report oxygen sensitivities from an experimental mesocosm we developed to manipulate soil oxygen status in realistic soils. The variation in oxygen sensitivity we uncover from this systematic review and experiment indicates that Earth system models may misrepresent the oxygen sensitivity of carbon mineralization, and how it varies with context, in wetland soils. We suggest that altered soil oxygen availability could be an important driver of future blue carbon storage in coastal wetlands.

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Responses of wetland soil carbon and nutrient pools and microbial activities after 7 years of experimental warming in the Yangtze Estuary

Ecological Engineering ◽

10.1016/j.ecoleng.2019.06.010 ◽

2019 ◽

Vol 136 ◽

pp. 68-78 ◽

Cited By ~ 2

Author(s):

Qicheng Zhong ◽

Kaiyun Wang ◽

Ming Nie ◽

Guilian Zhang ◽

Weiwei Zhang ◽

...

Keyword(s):

Soil Carbon ◽

Yangtze Estuary ◽

Wetland Soil ◽

Experimental Warming ◽

Microbial Activities ◽

The Yangtze Estuary ◽

Nutrient Pools

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Vulnerability of wetland soil carbon stocks to climate warming in the perhumid coastal temperate rainforest

Biogeochemistry ◽

10.1007/s10533-017-0324-y ◽

2017 ◽

Vol 133 (2) ◽

pp. 165-179 ◽

Cited By ~ 7

Author(s):

Jason B. Fellman ◽

David V. D’Amore ◽

Eran Hood ◽

Pat Cunningham

Keyword(s):

Soil Carbon ◽

Climate Warming ◽

Carbon Stocks ◽

Wetland Soil ◽

Temperate Rainforest ◽

Soil Carbon Stocks

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Carbon Fluxes and Stocks by Mexican Tropical Forested Wetland Soils: A Critical Review of Its Role for Climate Change Mitigation

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph17207372 ◽

2020 ◽

Vol 17 (20) ◽

pp. 7372

Author(s):

Sergio Zamora ◽

Luis Carlos Sandoval-Herazo ◽

Gastón Ballut-Dajud ◽

Oscar Andrés Del Ángel-Coronel ◽

Erick Arturo Betanzo-Torres ◽

...

Keyword(s):

Climate Change ◽

Soil Carbon ◽

Carbon Sink ◽

Carbon Stocks ◽

Response Strategy ◽

Forested Wetland ◽

Wetland Soils ◽

Carbon Sinks ◽

Tropical Regions ◽

Global Carbon

Wetland soils are important stores of soil carbon (C) in the biosphere, and play an important role in global carbon cycles in the response strategy to climate change. However, there areknowledge gaps in our understanding of the quantity and distribution in tropical regions. Specifically, Mexican wetlands have not been considered in global carbon budgets or carbon balances for a number of reasons, such as: (1) the lack of data, (2) Spanish publications have not been selected, or (3) because such balances are mainly made in the English language. This study analyzes the literature regarding carbon stocks, sequestration and fluxes in Mexican forested wetlands (Forest-W). Soil carbon stocks of 8, 24.5 and 40.1 kg cm−2 were detected for flooded palms, mangroves, and freshwater or swamps (FW) wetland soils, respectively, indicating that FW soils are the Forest-W with more potential for carbon sinks (p = 0.023), compared to mangroves and flooded palm soils. While these assessments of carbon sequestration were ranged from 36 to 920 g-C m−2 year−1, C emitted as methane was also tabulated (0.6–196 g-C m−2 year−1). Subtracting the C emitted of the C sequestered, 318.2 g-C m−2 year−1 were obtained. Such data revealed that Forest-W function is mainly as carbon sink, and not C source. This review can help to inform practitioners in future decisions regarding sustainable projects, restoration, conservation or creation of wetlands. Finally, it is concluded that Forest-W could be key ecosystems in strategies addressing the mitigation of climate change through carbon storage. However, new studies in this research line and public policies that protect these essential carbon sinks are necessary in order to, hopefully, elaborate global models to make more accurate predictions about future climate.

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