Global estimates of forest soil methane flux identify a temperate and tropical forest methane sink

Feng, Huili; Guo, Jiahuan; Peng, Changhui; Ma, Xuehong; Kneeshaw, Daniel; Chen, Huai; Liu, Qiuyu; Liu, Mengyao; Cheng, Hui‐Ming; Wang, Weifeng

doi:10.1016/j.geoderma.2022.116239

Cited by 6 publications

(7 citation statements)

References 75 publications

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“…(2019), from studies of reversing human land use to natural ecosystems. However, contrary results were reported from soils under afforestation worldwide (Feng et al., 2023; Gatica et al., 2020; Yu et al., 2017). The effects of C on CH 4 oxidation rates seem to depend on the type of ecosystem involved (humid and arid).…”

Section: Discussionmentioning

confidence: 77%

“…The negative correlation coefficients observed between OM and f CH 4 hint that CH 4 uptake increases when OM increases in these soils, coinciding with previous results reported in McDaniel et al (2019), from studies of reversing human land use to natural ecosystems. However, contrary results were reported from soils under afforestation worldwide (Feng et al, 2023;Gatica et al, 2020;Yu et al, 2017). The effects of C on CH 4 oxidation rates seem to depend on the type of ecosystem involved (humid and arid).…”

Section: Ch 4 Fluxes and Related Parametersmentioning

confidence: 72%

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Natural grassland conversion to agriculture or pine plantations: Effects on soil methane uptake

De Bernardi,

Priano,

Fernández

et al. 2024

Soil Use and Management

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Upland soils are the only known biological sink for methane (CH4) by methanotrophic bacteria consumption. This process is mainly limited by the diffusion processes related to the soil's physical characteristics, which can be modified because of changes in land use depending on the soil type, the original system and the new land use converted. Our study focused on determining the differences in soil CH4 uptake because of changes in land use (from natural grassland to agricultural land and two Pinus radiata afforestation, differing in thinning management) and on determining which are the main drivers that control CH4 uptake in the studied soil type (Hapludoll), with focus on the diffusion process. CH4 fluxes were measured 12 times with the static chamber technique between October 2015 and April 2019. Also, CH4 gradient concentration in the soil profile and physical and chemical variables were measured on the same dates. All land uses studied acted as net CH4 sinks. Land‐use change from grassland to agriculture decreased soil CH4 uptake (~37% ± 19), whereas afforestation increased (~85% ± 73) this environmental service related to natural grassland. We found that the main drivers that control CH4 uptake in this soil are water and air‐filled pore space, variables that govern soil CH4 diffusion; they are mostly related to differences in bulk density (compaction) among land uses. Organic matter was also an important driver, mainly related to soil structure. Land‐use change affected all of these drivers. CH4 concentration presented differences at deeper soil layers only in the two afforestations, which differed in management (pruning and thinning vs. no management). However, CH4 uptake did not present significant differences between them, suggesting that there is no need for a high tree cover to increase the CH4 sink of the soil. This mixed tree and herbaceous cover may result in a similar environmental service output, increasing the options of land uses.

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Section: Discussionmentioning

confidence: 77%

Section: Ch 4 Fluxes and Related Parametersmentioning

confidence: 72%

Natural grassland conversion to agriculture or pine plantations: Effects on soil methane uptake

De Bernardi,

Priano,

Fernández

et al. 2024

Soil Use and Management

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“…Forests occupy approximately 30% of the global land surface and play a crucial role in regulating the global carbon (C) cycle and reducing global warming 7 – 9 . A recent estimation reported that global forests maintained a net C sink of −7.6 Gt CO 2 e yr −1 , reflecting a balance between gross C removals (−15.6 Gt CO 2 e yr −1 ) and gross emissions (8.1 Gt CO 2 e yr −1 ) from deforestation and other disturbances, e.g., clear-cut, fire, windthrows, insects, etc 10 .…”

Section: Introductionmentioning

confidence: 99%

“…A recent estimation reported that global forests maintained a net C sink of −7.6 Gt CO 2 e yr −1 , reflecting a balance between gross C removals (−15.6 Gt CO 2 e yr −1 ) and gross emissions (8.1 Gt CO 2 e yr −1 ) from deforestation and other disturbances, e.g., clear-cut, fire, windthrows, insects, etc 10 . Afforestation and reforestation could change biomass accumulation and alter soil biogeochemical, physical and hydrological properties, thereby affecting the GHG fluxes 9 , 11 – 13 . Previous work found that converting croplands to forests increased CH 4 uptake due to the decreased soil bulk density, and afforestation decreased N 2 O emissions due to the reduced nitrogen (N) substrate availability 11 .…”

Section: Introductionmentioning

confidence: 99%

“…Despite numerous studies investigating the effects of ecological restoration on the emission of individual or a few GHGs at the plot or regional level 38 , the general pattern of the impacts of ecological restoration on the three major GHGs at a global scale has not yet been analyzed. Furthermore, there is currently a lack of comprehensive global assessments for the three major ecosystems (i.e., forests, grasslands, and wetlands) which are crucial for the global GHG budget and the ‘UN Decade on Ecosystem Restoration’ 6 – 9 . In addition, detailed data on the responses of GHG to ecological restoration are lacking in the IPCC reports, the IPCC Guidelines for National Greenhouse Gas Inventories, and the Good Practice Guidance for Land Use, Land-Use Change and Forestry.…”

Section: Introductionmentioning

confidence: 99%

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Meta-analysis shows the impacts of ecological restoration on greenhouse gas emissions

He,

Ding,

Cheng

et al. 2024

Nat Commun

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International initiatives set ambitious targets for ecological restoration, which is considered a promising greenhouse gas mitigation strategy. Here, we conduct a meta-analysis to quantify the impacts of ecological restoration on greenhouse gas emissions using a dataset compiled from 253 articles. Our findings reveal that forest and grassland restoration increase CH4 uptake by 90.0% and 30.8%, respectively, mainly due to changes in soil properties. Conversely, wetland restoration increases CH4 emissions by 544.4%, primarily attributable to elevated water table depth. Forest and grassland restoration have no significant effect on N2O emissions, while wetland restoration reduces N2O emissions by 68.6%. Wetland restoration enhances net CO2 uptake, and the transition from net CO2 sources to net sinks takes approximately 4 years following restoration. The net ecosystem CO2 exchange of the restored forests decreases with restoration age, and the transition from net CO2 sources to net sinks takes about 3-5 years for afforestation and reforestation sites, and 6-13 years for clear-cutting and post-fire sites. Overall, forest, grassland and wetland restoration decrease the global warming potentials by 327.7%, 157.7% and 62.0% compared with their paired control ecosystems, respectively. Our findings suggest that afforestation, reforestation, rewetting drained wetlands, and restoring degraded grasslands through grazing exclusion, reducing grazing intensity, or converting croplands to grasslands can effectively mitigate greenhouse gas emissions.

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Drivers of intra-individual spatial variability in methane emissions from tree trunks in upland forest

Mochidome,

Epron

2024

Trees

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Global estimates of forest soil methane flux identify a temperate and tropical forest methane sink

Cited by 6 publications

References 75 publications

Natural grassland conversion to agriculture or pine plantations: Effects on soil methane uptake

Natural grassland conversion to agriculture or pine plantations: Effects on soil methane uptake

Meta-analysis shows the impacts of ecological restoration on greenhouse gas emissions

Drivers of intra-individual spatial variability in methane emissions from tree trunks in upland forest

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