Organic and inorganic carbon storage in soils along an arid to dry sub-humid climosequence in northwest of Iran

Raheb, Alireza; Heidari, Ahmad; Mahmoodi, Shahla

doi:10.1016/j.catena.2017.01.035

Cited by 54 publications

(29 citation statements)

References 40 publications

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“…The variable response of SIC to land‐use change and its dependence on soil texture and climate observed in this study should be applied with care and should be incorporated into models to decrease the uncertainty when predicting soil C dynamics and sequestration potentials. Moreover, the increase in SIC after afforestation in arid and semiarid coarse soils indicated that sequestered C in these soils was more stable than that in relatively wet sites with fine soils given the small exchange with the atmosphere and the long turnover time of SIC (Lal & Kimble, ; Raheb et al, ). Therefore, increasing SIC and SOC through afforestation in arid and semiarid climate could be an effective option to mitigate increasing atmospheric CO 2 .…”

Section: Discussionmentioning

confidence: 99%

“…The SIC stock on China's Loess Plateau is 10.2 Pg C, which is 2.1‐times more than SOC stock in this region (Tan et al, ). Given the large reservoir but small exchange flux with the atmosphere (0.023 Pg yr −1 ) and long turnover time (85,000 yrs; Lal & Kimble, ; Raheb, Heidari, & Mahmoodi, ), knowledge about SIC dynamics is essential for evaluating the C budget and C cycle in arid and semiarid climates.…”

Section: Introductionmentioning

confidence: 99%

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Variable response of inorganic carbon and consistent increase of organic carbon as a consequence of afforestation in areas with semiarid soils

et al. 2019

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Soil inorganic carbon (SIC) is the most common form of carbon in arid and semiarid regions, where afforestation is used to combat soil degradation. However, response of SIC to afforestation has been studied rarely, which hinders any prediction about soil carbon dynamics. To determine the response of SIC and soil organic carbon (SOC) to afforestation in semiarid soils and whether such responses vary with soil aggregates, soil texture, and climatic conditions, we measured SIC and SOC in bulk soils and aggregate fractions under paired afforested lands and farmlands at five sites across the Loess Plateau. The relationship of these responses to soils and climatic variables was analyzed. Afforestation increased SOC at all sites, with accumulation rates of 0.21, 0.23, 0.34, and 0.09 g kg −1 yr −1 in bulk soils, macroaggregates (>0.25 mm), microaggregates (0.25-0.053 mm), and silt + clay fraction, respectively, when averaged across sites and soil depths. However, the response of SIC to afforestation varied with site, with increased SIC in drier sites and decreased SIC in wetter sites. Change in SIC was negatively correlated with change in SOC either across or within bulk soils and aggregate fractions. The SIC decreased and SOC increased with increasing soil clay content, precipitation, temperature, and site aridity index. These results indicated consistent increase in SOC but variable response of SIC to afforestation among sites in the Loess Plateau. Such variable response of SIC should be incorporated into carbon cycle models to reduce uncertainties when predicting sequestration dynamics of soil carbon.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Variable response of inorganic carbon and consistent increase of organic carbon as a consequence of afforestation in areas with semiarid soils

et al. 2019

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“…En nuestro caso, como se mencionó anteriormente, la actividad humana a través del manejo del suelo, diferente en cada sitio, es otra fuente de incertidumbre, ya que influye principalmente en la variabilidad espacial del COS, mientras que en el CIS depende de los factores formadores del suelo (material parental, clima, vegetación y relieve) y sus relaciones, entendiendo éstas como los procesos formadores del suelo o procesos pedogenéticos como la carbonatación. Éste es la acumulación pedogenética de carbonatos en el suelo, que dependen del clima y el estado de desarrollo de los suelos (Raheb et al, 2017). En suelos de regiones áridas acumula carbonatos pedogenéticos de sedimentos no calcáreos, donde se combinan iones alcalinotérreos (Ca 2+ y Mg 2+ , principalmente), que provinieron de la disolución de minerales primarios, con agua de lluvia y CO 2 de la respiración de las plantas (Drees et al, 2001) y se acumulan en las capas superficiales y subsuperficiales del suelo por la alta evaporación que existe en esas regiones (Cox, 2012), mientras que, a su vez, el relieve o fisiografía puede influir en su distribución.…”

Section: Discussionunclassified

Variabilidad espacial del carbono orgánico e inorgánico del suelo en la Comarca Lagunera, México

Yescas-Coronado

Álvarez-Reyna

Segura-Castruita³

et al. 2018

BSGM

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Organic, inorganic and total soil carbon stocks are partially controlled by exposure to environmental conditions, vegetation cover and land use. Geostatistics has helped to understand the distribution of carbon stocks (organic, inorganic and total) in the soils. However, there is little explanation of factors that determine it, specifically arid regions, and their spatial variability. The objectives of this work were to determine the organic and inorganic carbon reserves in agricultural soils of the Comarca Lagunera in Mexico, to establish their distribution and spatial variability using ordinary kriging and to validate the thematic maps whit real data. The correlation spatial of organic, inorganic and total soil carbon stocks of georeferenced samples were examined by an analysis of semivariance; the data were interpolated to obtain thematic maps of prediction of the different carbon stocks. Subsequently, the maps were validated with field data. The organic, inorganic and total soil carbon stocks showed spatial correlation, which was weak for the soil organic carbon storage (82.4%), and moderate for the inorganic and total carbon (26.6 and 35.0%, respectively). The thematic maps of organic and inorganic carbon stores differed, with the inorganic carbon map having an error of 2.01 Mg ha-1 , which was lower than that of organic carbon (4.69 Mg ha-1). The use and management of soils in this area influenced the spatial distribution of carbon stocks, while physiography, parent material and climate intervened in the spatial distribution of inorganic carbon.

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“…Soil erosion and re-deposition/redistribution is profound in the Loess Plateau (Zheng et al 2005), which would move topsoil from highland to lowland, leading to enhanced SOC storage (but with lower SIC stock) in upper 100 cm (Table 3). In addition, elevated SOC level in the soil pro le of LFB could also result in more CO 2 production thus lower pH (Table 1), which causes dissolution of soil carbonate (Chang et al 2012, Raheb et al 2017).…”

Section: The Relationship Between Sic and Soc In Loessmentioning

confidence: 99%

“…The non-signi cantly SIC-SOC relationship in YCB may re ect the complex in uences of multi drivers. There is evidence that precipitation has large impacts on both SOC and SIC in arid/semi-arid lands (Li et al 2007, Raheb et al 2017, Wu et al 2009, particularly in the Loess Plateau (Han et al 2018). The YCB has a large spatial variation in both precipitation (500-750 mm) and elevation (380-820 m a.s.l.…”

Section: The Relationship Between Sic and Soc In Loessmentioning

confidence: 99%

Fractions of soil organic and inorganic carbon and their relationships in typical loess cropland of Fenggu Basin

Wang

Zhang

2020

Preprint

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There is evidence of connections between soil organic carbon (SOC) and inorganic carbon (SIC) in dryland of north China. However, fractions of SOC and SIC and the relationship are not well understood in the Loess Plateau that undergoes profound erosion and redeposition. A study was conducted in low-elevation cropland of Loess Plateau across two distinctive basins: Lingfeng basin (LFB) with lower soil pH (< 8.4) and subject to erosion-redeposition, and Yuncheng basin (YCB) with higher soil pH (> 8.6) and under the influence of the Yellow River. Soil samples were collected from 30 sites over 100 cm. We determined SOC, SIC, dissolved organic carbon (DOC) and other properties. Above 100 cm, SOC stock is significantly higher in LFB (10.0 ± 2.6 kg C m− 2) than in YCB (6.9 ± 1.5 kg C m− 2), but SIC lower in LFB (14.0 ± 2.5 kg C m− 2) than in YCB (17.0 ± 5.7 kg C m− 2). We find a significantly negative correlation between SOC and SIC stocks in LFB, but no clear relationship in YCB. On average, DOC:SOC ratio is significantly higher below 40 cm in YCB (1.9%) than LFB (1.2%), indicating stronger DOC desorption in YCB that has stronger hydrological process due to the influence of the Yellow River. Overall, SOC has a negative correlation with SIC and soil pH, and DOC:SOC ratio has a significantly positive correlation with soil pH. Our analyses suggest that erosion/re-deposition of topsoil is partly responsible for the negative SIC-SOC relationship in LFB, and high soil pH and stronger hydrological processes are attributable to relatively lower levels of SOC in YCB. This study highlights that soil carbon fractions in the lowland of Loess Plateau are influenced by many drivers, which leads to complex relationships between major soil carbon pools.

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Organic and inorganic carbon storage in soils along an arid to dry sub-humid climosequence in northwest of Iran

Cited by 54 publications

References 40 publications

Variable response of inorganic carbon and consistent increase of organic carbon as a consequence of afforestation in areas with semiarid soils

Variable response of inorganic carbon and consistent increase of organic carbon as a consequence of afforestation in areas with semiarid soils

Variabilidad espacial del carbono orgánico e inorgánico del suelo en la Comarca Lagunera, México

Fractions of soil organic and inorganic carbon and their relationships in typical loess cropland of Fenggu Basin

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