Increased uncertainty in soil carbon stock measurement with spatial scale and sampling profile depth in world grasslands: A systematic analysis

Maillard, Émilie; McConkey, B.G.; Angers, Denis A.

doi:10.1016/j.agee.2016.11.024

Cited by 38 publications

(23 citation statements)

References 69 publications

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“…Moreover, the SOCD of the ESET region at 0–30 cm was similar to that of the Australian temperate grassland (4.9 kg/m 2 ) [ 6 ], New Zealand grassland (6.83 kg/m 2 ) [ 50 ], Iranian grassland (6.33 kg/m 2 )[ 51 ] and American temperate grassland (5.5 kg/m 2 ) [ 52 ]. These values are consistent with the global grassland soil organic carbon storage patterns derived from model simulations [ 53 , 54 ], which show that the soil organic carbon storage of tropical savannah is lower than that of temperate grasslands and that colder grasslands exhibit higher soil organic carbon storage ( Table 3 ).…”

Section: Discussionsupporting

confidence: 87%

Effects of temperature and grazing on soil organic carbon storage in grasslands along the Eurasian steppe eastern transect

et al. 2017

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Soil represents the largest terrestrial organic carbon pool. To address global climate change, it is essential to explore the soil organic carbon storage patterns and their controlling factors. We investigated the soil organic carbon density (SOCD) in 48 grassland sites along the Eurasian steppe eastern transect (ESET) region, which covers the Inner Mongolia grassland subregion and Mongolia grasslands subregion. Specifically, we analyzed the SOCD in the top 30 cm soil layer and its relationships with climatic variables, soil texture, grazing intensity and community biomass productivity. The results showed that the average SOCD of the ESET was 4.74 kg/m2, and the SOCD of the Inner Mongolia grassland subregion (4.11 kg/m2) was significantly lower than that of the Mongolia grassland subregion (5.79 kg/m2). Significant negative relationships were found between the SOCD and the mean annual temperature (MAT), mean annual precipitation (MAP) and grazing intensity in the ESET region. The MAT and grazing intensity were identified as the major factors influencing the SOCD in the ESET region; the MAP and MAT were the major factors influencing the SOCD in the Inner Mongolia grassland subregion; and the MAT and soil pH were the major factors influencing the SOCD in the Mongolia grassland subregion.

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Section: Discussionsupporting

confidence: 87%

Effects of temperature and grazing on soil organic carbon storage in grasslands along the Eurasian steppe eastern transect

et al. 2017

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“…At present, there is a lack of large‐scale predictions (Maillard, McConkey, & Angers, ) Although the application of RS and multivariate methods for large‐scale predictions has improved data utilization efficiency, large‐scale predictions display a lower predictive accuracy than small‐scale predictions (Croft, Kuhn, & Anderson, ; de Araujo Barbosa, Atkinson, & Dearing, ; Grinand et al, ). It is not easy to map SOC contents at a very high resolution (<1 m) at a large scale for either data acquisition or model robustness.…”

Section: Discussionmentioning

confidence: 99%

“…At present, there is a lack of large-scale predictions (Maillard, McConkey, & Angers, 2017) Although the application of RS and multivariate methods for large-scale predictions has improved data utilization efficiency, large-scale predictions display a lower predictive Note. RMSE referred to as root mean square error of observed and predicted SOC/biomass.…”

Section: Challenges In Assessing Land Degradation At a Large Scalementioning

confidence: 99%

Large‐scale soil organic carbon mapping based on multivariate modelling: The case of grasslands on the Loess Plateau

Wang

Deng

et al. 2017

Land Degrad Dev

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The Loess Plateau is considered one of the world's regions with severe soil erosion. Grasslands are widely distributed on the Loess Plateau, accounting for approximately 40% of the total area.Soil organic carbon (SOC) plays an important role in the terrestrial carbon cycle in this region.We compiled more than 1,000 measurements of plant biomass and SOC content derived from 223 field studies of grasslands on the Loess Plateau. Combined with meteorological factors (precipitation and air temperature) and the photosynthetically active radiation factor, the topsoil SOC contents of grasslands were predicted using the random forest (RF) regression algorithm. biomass and temperature should receive more attention due to increasing C sequestration.

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“…Furthermore, the cost and precision of measuring changes in soil C stocks and fluxes must be assessed at different scales(M€ akip€ a€ a, Hakkinen, Muukkonen, & Peltoniemi, 2008). The uncertainty involved in measuring SOC stocks, especially in relation to spatial scale(Maillard, McConkey, & Angers, 2017), must be minimized by developing appropriate sampling strategies.…”

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confidence: 99%

Digging deeper: A holistic perspective of factors affecting soil organic carbon sequestration in agroecosystems

Lal

2018

Global Change Biology

555

239

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The global magnitude (Pg) of soil organic carbon (SOC) is 677 to 0.3-m, 993 to 0.5-m, and 1,505 to 1-m depth. Thus, ~55% of SOC to 1-m lies below 0.3-m depth. Soils of agroecosystems are depleted of their SOC stock and have a low use efficiency of inputs of agronomic yield. This review is a collation and synthesis of articles published in peer-reviewed journals. The rates of SOC sequestration are scaled up to the global level by linear extrapolation. Soil C sink capacity depends on depth, clay content and mineralogy, plant available water holding capacity, nutrient reserves, landscape position, and the antecedent SOC stock. Estimates of the historic depletion of SOC in world soils, 115-154 (average of 135) Pg C and equivalent to the technical potential or the maximum soil C sink capacity, need to be improved. A positive soil C budget is created by increasing the input of biomass-C to exceed the SOC losses by erosion and mineralization. The global hotspots of SOC sequestration, soils which are farther from C saturation, include eroded, degraded, desertified, and depleted soils. Ecosystems where SOC sequestration is feasible include 4,900 Mha of agricultural land including 332 Mha equipped for irrigation, 400 Mha of urban lands, and ~2,000 Mha of degraded lands. The rate of SOC sequestration (Mg C ha year ) is 0.25-1.0 in croplands, 0.10-0.175 in pastures, 0.5-1.0 in permanent crops and urban lands, 0.3-0.7 in salt-affected and chemically degraded soils, 0.2-0.5 in physically degraded and prone to water erosion, and 0.05-0.2 for those susceptible to wind erosion. Global technical potential of SOC sequestration is 1.45-3.44 Pg C/year (2.45 Pg C/year).

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Increased uncertainty in soil carbon stock measurement with spatial scale and sampling profile depth in world grasslands: A systematic analysis

Cited by 38 publications

References 69 publications

Effects of temperature and grazing on soil organic carbon storage in grasslands along the Eurasian steppe eastern transect

Effects of temperature and grazing on soil organic carbon storage in grasslands along the Eurasian steppe eastern transect

Large‐scale soil organic carbon mapping based on multivariate modelling: The case of grasslands on the Loess Plateau

Digging deeper: A holistic perspective of factors affecting soil organic carbon sequestration in agroecosystems

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