Global patterns of geo-ecological controls on the response of soil respiration to warming

Haaf, David; Six, Johan; Doetterl, Sebastian

doi:10.1038/s41558-021-01068-9

Cited by 76 publications

(50 citation statements)

References 94 publications

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“…In contrast to studies on soils in temperate climate zones (Franzluebbers and Arshad, 1997;Hassink, 1997;Schleuß et al, 2014), in our study aggregation and soil texture played only a secondary role in explaining variability in SPR and 14 C and their influence decreased with soil depth (Table 3). We explain this observation with the fact that clay minerals at advanced weathering stages, such as kaolinite, dominating in tropical soils, generally show lower activity and reactive surfaces than clay minerals dominating earlier weathering stages (e.g.…”

Section: The Role Of Tropical Weathering and Mineral Relatedcontrasting

confidence: 99%

“…Bukombe et al: Soil respiration and carbon cycling in tropical forests (OM) input to soil (Fontaine et al, 2007) and the availability of water and energy to drive microbial processes. However, recent studies show that SOC dynamics are controlled by a much more complex interplay of geochemistry, topography, climate and biology (Doetterl et al, 2015b(Doetterl et al, , 2018Haaf et al, 2021;Luo et al, 2017Luo et al, , 2019, much like pedogenesis in general. For example, on average 72 % of SOC in humid forest biomes is stabilized by interaction with the mineral phase in soil organo-mineral interactions and occlusion by aggregation (Kramer and Chadwick, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Heterotrophic soil respiration and carbon cycling in geochemically distinct African tropical forest soils

Bukombe

Fiener

Hoyt

et al. 2021

SOIL

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Abstract. Heterotrophic soil respiration is an important component of the global terrestrial carbon (C) cycle, driven by environmental factors acting from local to continental scales. For tropical Africa, these factors and their interactions remain largely unknown. Here, using samples collected along topographic and geochemical gradients in the East African Rift Valley, we study how soil chemistry and fertility drive soil respiration of soils developed from different parent materials even after many millennia of weathering. To address the drivers of soil respiration, we incubated soils from three regions with contrasting geochemistry (mafic, felsic and mixed sediment) sampled along slope gradients. For three soil depths, we measured the potential maximum heterotrophic respiration under stable environmental conditions and the radiocarbon content (Δ14C) of the bulk soil and respired CO2. Our study shows that soil fertility conditions are the main determinant of C stability in tropical forest soils. We found that soil microorganisms were able to mineralize soil C from a variety of sources and with variable C quality under laboratory conditions representative of tropical topsoil. However, in the presence of organic carbon sources of poor quality or the presence of strong mineral-related C stabilization, microorganisms tend to discriminate against these energy sources in favour of more accessible forms of soil organic matter, resulting in a slower rate of C cycling. Furthermore, despite similarities in climate and vegetation, soil respiration showed distinct patterns with soil depth and parent material geochemistry. The topographic origin of our samples was not a main determinant of the observed respiration rates and Δ14C. In situ, however, soil hydrological conditions likely influence soil C stability by inhibiting decomposition in valley subsoils. Our results demonstrate that, even in deeply weathered tropical soils, parent material has a long-lasting effect on soil chemistry that can influence and control microbial activity, the size of subsoil C stocks and the turnover of C in soil. Soil parent material and its control on soil chemistry need to be taken into account to understand and predict C stabilization and rates of C cycling in tropical forest soils.

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Section: The Role Of Tropical Weathering and Mineral Relatedcontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Heterotrophic soil respiration and carbon cycling in geochemically distinct African tropical forest soils

Bukombe

Fiener

Hoyt

et al. 2021

SOIL

Self Cite

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“…In addition, the sum of aboveground plant respiration and belowground soil respiration is ecosystem respiration. Thus, these processes of C cycling together play a key role in regulating the SOC pool in response to warming (Carey et al, 2016; Haaf et al, 2021; Wang, Liu, et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Warming has a minor effect on surface soil organic carbon in alpine meadow ecosystems on the Qinghai–Tibetan Plateau

Chen

Han

Yuan

et al. 2021

Global Change Biology

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The alpine meadow ecosystem on the Qinghai–Tibetan Plateau (QTP) is very sensitive to warming and plays a key role in regulating global carbon (C) cycling. However, how warming affects the soil organic carbon (SOC) pool and related C inputs and outputs in alpine meadow ecosystems on the QTP remains unclear. Here, we combined two field experiments and a meta‐analysis on field experiments to synthesize the responses of the SOC pool and related C cycling processes to warming in alpine meadow ecosystems on the QTP. We found that the SOC content of surface soil (0–10 cm) showed a minor response to warming, but plant respiration was accelerated by warming. In addition, the warming effect on SOC was not correlated with experimental and environmental variables, such as the method, magnitude and duration of warming, initial SOC content, mean annual temperature, and mean annual precipitation. We conclude that the surface SOC content is resistant to climate warming in alpine meadow ecosystems on the QTP.

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“…Rotated PCA (details see supplementary text) was used to reduce dimension of the independent variables and further improve the interpretation of larger groups of controls [26]. According to the variable loadings of rotated PCA and correlations among the meteorological variables (supplementary figure S2, tables S2-S5), we found temperature related 11 bioclimatic factors and precipitation related eight bioclimatic factors were always classified into different components.…”

Section: Principal Component Analysis (Pca) and Reclassify The Covari...mentioning

confidence: 99%

Shift in controlling factors of carbon stocks across biomes on the Qinghai-Tibetan Plateau

Han

Wang

et al. 2022

Environ. Res. Lett.

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The Qinghai-Tibetan Plateau (TP) accumulated a large amount of organic carbon, while its size and responses to environmental factors for the whole area remain uncertain. Here, we synthesized a dataset to date with the largest data volume and broadest geographic coverage over the TP, composing of 7196 observations from multiple field campaigns since the 1980s, and provided a comprehensive assessment of the size and spatial distribution of carbon pools for both plant and soils with depth intervals on the TP using machine learning algorithms. The estimated soil organic carbon (SOC) pool to 1m depth was 32.0147.9 19.69Pg (11.7217.53 7.2 kg m-2 on average), accounting for 37.255.6 22.9% of China’s soil C storage on its <30% land area. There was 15.5223.52 9.91 Pg C stored in grassland soils (1 m), which played as the largest C pool on the TP, followed by shrubland (7.5211.6 4.8 Pg) and forest (3.725.36 2.5 Pg). The estimated plant C storage was 2.45.16 0.95 Pg ( 1.032.7 0.2 Pg in aboveground biomass (AGB) and 1.372.45 0.75 Pg in belowground biomass (BGB)). Soil and biomass C density presented a similar spatial pattern, which generally decreased from the east and southeast parts to the central and western parts. Main driving factors of the carbon pools varied among vegetation types and depth intervals. AGB played as an important role in SOC variation for both topsoil (0-30 cm) and subsoil (30-100 cm), though the strength of the correlation weakened with depth and was gradually attenuated from grassland to shrubland, and forest. The outcomes of this study provided an updated geospatial estimate of SOC stocks for the entire TP and their relationships with environmental factors, which are essential to carbon model benchmarking and better understanding the feedbacks of C stocks to global change.

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Global patterns of geo-ecological controls on the response of soil respiration to warming

Cited by 76 publications

References 94 publications

Heterotrophic soil respiration and carbon cycling in geochemically distinct African tropical forest soils

Heterotrophic soil respiration and carbon cycling in geochemically distinct African tropical forest soils

Warming has a minor effect on surface soil organic carbon in alpine meadow ecosystems on the Qinghai–Tibetan Plateau

Shift in controlling factors of carbon stocks across biomes on the Qinghai-Tibetan Plateau

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