Dissolved organic carbon and its carbon isotope compositions in hill slope soils of the karst area of southwest China: Implications for carbon dynamics in limestone soil

Liu, Tao-Ze; Liu, Cong‐Qiang; Lang, Yunchao; Ding, Hu

doi:10.2343/geochemj.2.0304

Cited by 12 publications

(7 citation statements)

References 34 publications

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“…A more reasonable assumption, that 13 C-enriched DOC was translocated from its original site into underground water, was proposed in this paper. Liu et al [58] reported that DOC/SOC ratios increased from 0.2% to 1.1% with depth, and δ 13 C DOC increased by 3-6‰ with depth in some soil profiles of karst soils. Anyhow, the 13 C fractionation of SOC at depth should be further researched in karst soils.…”

Section: Fractionation Of C and N Isotopic In Decomposition Transformentioning

confidence: 99%

Variations and Indications of δ13CSOC and δ15NSON in Soil Profiles in Karst Critical Zone Observatory (CZO), Southwest China

et al. 2019

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Soil carbon and nitrogen storage and stabilization are the key to solving the problems of mitigation of global warming and maintaining of crop productivity. In this study, the contents of soil organic carbon (SOC) and soil organic nitrogen (SON) and their stable isotope compositions (δ13CSOC and δ15NSON) in soil profiles were determined in two agricultural lands (including a farmland and an abandoned farmland) and four non-agricultural lands (including two shrub-grass lands and two shrub lands) in the karst critical zone observatory (CZO), Southwest China. The contents of SOC and SON were used for research on the effects of land use on SOC and SON storage, and the change of δ13CSOC and δ15NSON values in soil profiles were used to indicate SOC and SON stabilization. The results showed that agricultural activities reduced SOC and SON storage in the whole soil layers of farmland compared to non-agricultural lands, and farmland abandonment slightly increased SOC and SON storage. Crop rotation between peanut (C3) and corn (C4) affected the δ13CSOC in surface soils of agricultural lands (−21.6‰), which were intermediate between shrub lands (−22.7‰) and shrub-grass lands (−19.6‰). 15N-depleted SON in surface soils in farmland compared to those soil in other lands possibly associated with synthetic N fertilizer application. In soil layers below 30 cm depth the δ13CSOC deceased with depth, while the δ15NSON displayed irregular fluctuation. The change in δ13CSOC and δ15NSON through soil profiles in karst soils were more intensive than those in semiarid grassland soils indicating the less stabilization of SOC and SON in karst soils.

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Section: Fractionation Of C and N Isotopic In Decomposition Transformentioning

confidence: 99%

Variations and Indications of δ13CSOC and δ15NSON in Soil Profiles in Karst Critical Zone Observatory (CZO), Southwest China

et al. 2019

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“…Often, calculation accuracy is greatly reduced since the spatial heterogeneity of regional SOCD is ignored owing to limitations on sampling density at a global [7] or national [8] scale. At present, in terms of the spatial heterogeneity of SOCD, there are studies of specific regions [9], basins [10], a province, or several provinces [11]. However, the density of SOCD's spatial heterogeneity is correlated with a change in scale, and the research is based on the above three scales, ranging from small-to medium-scale spatial distribution characteristics of soil organic carbon on a continuous spatial scale, which has rarely been reported.…”

mentioning

confidence: 99%

Soil Organic Carbon Density Spatial Distribution and Influencing Factors in a Karst Mountainous Basin

Zhang

Wang²,

Huang

2017

Pol. J. Environ. Stud.

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“…These methods are used to estimate the organic carbon stock of large non-karst areas from various perspectives and based on various considerations [18]. However, to estimate soil organic carbon storage in small drainage basins in karst areas, it is necessary to consider the local scale and spatial heterogeneity [19]. Thus, the choice of an estimation method is critical.…”

Section: Impacts Of Using Different Methods To Estimate Soil Organic mentioning

confidence: 99%

Comparing Estimation Methods for Soil Organic Carbon Storage in Small Karst Watersheds

Zhang¹,

Zhou²,

Wang³

et al. 2018

Pol. J. Environ. Stud.

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In order to accurately estimate soil organic carbon storage (SOCS), 2,755 soil profiles and 23,536 soil samples were acquired by grid method, followed by a study on the SOCS, soil bulk density (SBD), gravel content (GC), and distribution characteristics of rock coverage (RC) in a small karst watershed (SKC). Then on the basis of soil profile summation, an investigation was done on the applicability of RC/GC-based soil type method, land utilization type method, and aspect method to the estimation of SOCS in SKC at different depths. As shown by the results, the average soil organic carbon content (SOC) in the soil samples ranged from 5.25 to 24.87 g.kg-1 , and decreased with the soil depth increasing; the average SBD ranged from 1.17 to 1.41 g.cm-3 , which first increased with the soil depth increasing and then tended to be steady; the average GC ranged from 0 to 20.15%, which decreased gradually with the soil depth increasing and finally to zero; the RC ranged from 0 to 86.32% at different sample points. RC and GC greatly affected the estimation of SOCS, so after correction based on RC and GC, the soil type method was adopted for estimation, concluding that SOCS at depths of 0-20 cm, 0-30 cm, and 0-100 cm was 341.82×10 6 kg, 449.29×10 6 kg, and 738.351×0 6 kg, respectively; RC and GC affected white sandy soil the most, as shown by the following SOCS estimated by the land utilization type method: 319.56×10 6 kg, 416.04×10 6 kg, and 607.02×10 6 kg, respectively, at depths of 0-20 cm, 0-30 cm, and 0-100 cm; RC and GC affected wasteland the most, as shown by the following SOCS estimated by the aspect method: 318.64×10 6 kg, 411.63×10 6 kg, and 628.46×10 6 kg, respectively, at depths of 0-20 cm, 0-30 cm, and 0-100 cm; RC and GC affected the SOCS in the south slope the most; in terms of catchment scale, the "vertical stratification + horizontal classification" pattern was expanded to the "land utilization type method" and "aspect method." For estimating the SOCS in topsoil, the aspect method achieved the best result, while the land utilization type method achieved the best result at a depth of 100 cm.

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Dissolved organic carbon and its carbon isotope compositions in hill slope soils of the karst area of southwest China: Implications for carbon dynamics in limestone soil

Cited by 12 publications

References 34 publications

Variations and Indications of δ13CSOC and δ15NSON in Soil Profiles in Karst Critical Zone Observatory (CZO), Southwest China

Variations and Indications of δ13CSOC and δ15NSON in Soil Profiles in Karst Critical Zone Observatory (CZO), Southwest China

Soil Organic Carbon Density Spatial Distribution and Influencing Factors in a Karst Mountainous Basin

Comparing Estimation Methods for Soil Organic Carbon Storage in Small Karst Watersheds

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