Digging deeper: the value of deep soil carbon for potential REDD+ projects in tropical forest communities in Amazonia

Strey, Simone; Boy, Jens; Strey, Robert; Welpelo, Anna; Schönenberg, Regine; Schumann, Charlotte; Guggenberger, Georg

doi:10.3112/erdkunde.2017.03.05

Cited by 10 publications

(5 citation statements)

References 5 publications

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“…However, subsoil C represented an average of 30% of the total C sequestered in the soil profiles (29, 32, and 27% of total SOC under forest, cassava, and paddy, respectively) ( Figure 3b). This finding that subsoil is an important storage site for SOC is supported by a recent study of C sequestration in an Oxisol in an Amazonian forest [51], which found that only 22% of C in the whole soil profile was in the topsoil, 52% was in the top meter, and 84% was down to 3 m. Based on this finding, the researchers recommended evaluating subsoil C sequestration even down to 3 m [51]. Our findings provide additional empirical support for the need to take subsoil into account as an important C sink that may make a major contribution to global C sequestration and thus exert an impact on climate change.…”

Section: Carbon Sequestration In Topsoil and Subsoilsupporting

confidence: 68%

Land–Use Changes Influencing C Sequestration and Quality in Topsoil and Subsoil

2019

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Soil capacity as a major carbon (C) sink is influenced by land use. Estimates of soil organic carbon (SOC) sequestration have mostly focused on topsoils [0–30 cm official Intergovernmental Panel on Climate Change (IPCC) soil depth]. We investigated SOC stocks and their quality as influenced by land-use changes. Soil samples were collected from five soil depths down to 100 cm of three adjacent fields each representing a different land use—forest, cassava, and rice paddy—in Northeast Thailand. Sequestration of SOC in topsoils under all land uses was higher, as indicated by SOC stocks (59.0–82.0 Mg ha−1) than subsoils (30–100 cm) (27.0–33.0 Mg ha−1). The soil profile (0–100 cm) of the forest had higher stocks of SOC and humic acid (115.0 and 6.8 Mg ha−1, respectively) than those of cultivated land uses [paddy (100.0 and 4.8 Mg ha−1, respectively) and cassava (87.0 and 2.3 Mg ha−1, respectively)], which accounted for an average 30% increase in SOC sequestration over those with only topsoil. Topsoils of the forest had higher humic acid content but narrower E4:E6 ratio [the ratio of absorbances at 465 nm (E4) and at 665 nm (E6)] of humic acids (2.8), indicating a higher degree of humification and stabilization than the cultivated soils (3.2–3.6). Subsoil C was higher quality, as indicated by the lower E4:E6 ratio of humic acids than topsoils in all land uses.

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Section: Carbon Sequestration In Topsoil and Subsoilsupporting

confidence: 68%

Land–Use Changes Influencing C Sequestration and Quality in Topsoil and Subsoil

2019

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“…Deep roots have been found to be important for many vegetation types and ecosystems (Canadell et al, 1996;Germon et al, 2020;Pierret et al, 2016): for multiple tree species in tropical forests (e.g. (Nepstad et al, 1994;Jipp et al, 1998;Strey et al, 2017), for Acacias in semi-arid savannahs such as SD-Dem (Ardö et al, 2008), and for fast-growing Eucalypt and Acacia mangium plantations in Brazil (Christina et al, 2011;Laclau et al, 2013;Germon et al, 2018), to name a few examples. These examples contrast with the shallow soils (3 meters) in the default JULES simulations.…”

Section: Discussionmentioning

confidence: 99%

Improvement of modelling plant responses to low soil moisture in JULESvn4.9 and evaluation against flux tower measurements

Harper¹,

Williams²,

McGuire³

et al. 2020

Preprint

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Abstract. Drought is predicted to increase in the future due to climate change, bringing with it a myriad of impacts on ecosystems. Plants respond to drier soils by reducing stomatal conductance, in order to conserve water and avoid hydraulic damage. Despite the importance of plant drought responses for the global carbon cycle and local/regional climate feedbacks, land surface models are unable to capture observed plant responses to soil moisture stress. We assessed the impact of soil moisture stress on simulated gross primary productivity (GPP) and latent energy flux (LE) in the Joint UK Land Environment Simulator (JULES) vn4.9 on seasonal and annual timescales, and evaluated ten different representations of stress in the model. For the default configuration, GPP was more realistic in temperate biome sites than in the tropics or high latitudes/cold region sites, while LE was best simulated in temperate and high latitude/cold sites. Errors not due to soil moisture stress, possibly linked to phenology, contributed to model biases for GPP in tropical savannah and deciduous forest sites. We found that three alternative approaches to calculating soil moisture stress produced more realistic results than the default parameterization for most biomes and climates. All of these involved increasing the number of soil layers from 4 to 14, and the soil depth from 3m to 10.8m. In addition, we found improvements when soil matric potential replaced volumetric water content in the stress equation, when the onset of stress was delayed, and when roots extended deeper into the soil. For LE, the biases were highest in the default configuration in temperate mixed forests, with overestimation occurring during most of the year. At these sites, reducing soil moisture stress (with the new parameterizations mentioned above) increased LE and made the simulation worse. Further evaluation into the reason for the high bias in LE at many of the sites would enable improvements in both carbon and energy fluxes with new parameterizations for soil moisture stress.

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“…How much should be spent led to the question that seemed to be far more interesting than the theory: how much carbon was in the indigenous territory? We explained that the numbers presented were projections based on the samples, and also tried to explain how these results were reached (debating calculations via satellite images versus soil analysis), and even tried to make the argument that current calculations were considering way too short a layer of the soil -50% of the soil carbon had been found in the layers below the 1 m layer that is taken as the basis for the common carbon stock calculation schemes [45].…”

Section: Ucl Open Environmentmentioning

confidence: 99%

Communicating climate change and biodiversity loss with local populations: Exploring communicative utopias in eight transdisciplinary case studies

Ansari

Schönenberg

Abud

et al. 2023

Preprint

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Climate change and biodiversity loss trigger policies targeting and impacting local communities worldwide. However, research and policy implementation often fail to sufficiently consider community responses and involve them. We present the results of a collective self-assessment exercise for eight case studies of communications regarding climate change or biodiversity loss between project teams and local communities. We develop eight indicators of good stakeholder communication, reflecting the scope of Verran (2002)'s concept of postcolonial moments as a communicative utopia. We demonstrate that applying our indicators can enhance communication and enable community responses. However, we discover a divergence between timing, complexity, and (introspective) effort. Three cases qualify for postcolonial moments, but scrutinizing power relations and genuine knowledge co-production remain rare. While we verify the potency of various instruments for deconstructing science, their sophistication cannot substitute trust building and epistemic/transdisciplinary awareness. Lastly, we consider that reforming inadequate funding policies helps improving the work in and with local communities.

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Digging deeper: the value of deep soil carbon for potential REDD+ projects in tropical forest communities in Amazonia

Cited by 10 publications

References 5 publications

Land–Use Changes Influencing C Sequestration and Quality in Topsoil and Subsoil

Land–Use Changes Influencing C Sequestration and Quality in Topsoil and Subsoil

Improvement of modelling plant responses to low soil moisture in JULESvn4.9 and evaluation against flux tower measurements

Communicating climate change and biodiversity loss with local populations: Exploring communicative utopias in eight transdisciplinary case studies

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