Concentration and biodegradability of dissolved organic carbon derived from soils: A global perspective

Liu, Futing; Wang, Dong; Zhang, Beibei; Huang, Jin

doi:10.1016/j.scitotenv.2020.142378

Cited by 44 publications

(16 citation statements)

References 58 publications

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“…The distributions of topsoil [DOC] values were best approximated as lognormal. The mean log [DOC] values for combined forest and grass-shrub topsoils increased significantly (t-tests, p < 0.001) in the order zone A < zone C < zone D, which follows other findings in the literature (Langeveld et al, 2020;Camino-Serrano et al, 2014;Liu et al, 2021). There were insufficient topsoil pasture or wetland [DOC] values to distinguish between climate zones, and so the data were combined.…”

Section: Soils and Groundwatersupporting

confidence: 79%

Relationships between riverine and terrestrial dissolved organic carbon: Concentration, radiocarbon signature, specific UV absorbance

Tipping

Elias

Keenan

et al. 2022

Science of The Total Environment

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Section: Soils and Groundwatersupporting

confidence: 79%

Relationships between riverine and terrestrial dissolved organic carbon: Concentration, radiocarbon signature, specific UV absorbance

Tipping

Elias

Keenan

et al. 2022

Science of The Total Environment

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“…The OP showed the lowest soil DOC concentration and the highest CDOM concentration, all absorbance values, SUAV 254 , SUVA 260 , and C:C ratio compared to other two land uses. The extraneous fertilization and vegetation species were collectively responsible for the more coloured, aromatic, and hydrophobic compounds in DOC in the OP (Chantigny, 2003; Liu et al, 2021). The extraneous fertilizers in the OP supplied substantial nutrients for aboveground vegetation and microorganism, ensuring abundant and continuous inputs of DOC to soil (Liu et al, 2020), but the organic mineralization and microbial consumption of non‐colour simple compounds were more active due to the lower C:N ratio and higher C:C ratio, leading to the relatively higher accumulation of these compounds (Tian et al, 2010; Wallage et al, 2006).…”

Section: Discussionmentioning

confidence: 99%

“…Dissolved organic carbon (DOC) is generally defined as a mixture of water‐soluble organic compounds with different molecule sizes and structures, and is widely distributed in terrestrial and aquatic ecosystems (Chantigny, 2003; Zsolnay, 2003). Although DOC only accounts for a very small part of soil organic matter (i.e., <0.25%), it is the most active and easily mobile fraction of soil organic carbon, and plays a key role in soil formation (Liu et al, 2021), microbial activity (Tada et al, 2017), nutrients mobility, and availability (e.g., N, P, and S) (Kalbitz et al, 2000). Previous studies have reported the spatiotemporal characteristics of DOC quantity and quality in aquatic ecosystems (Wallage et al, 2006; Zhang et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…For instance, Jiang et al (2018) investigated the dynamics of CDOM concentration in the water level fluctuation zone of the Three Gorges Reservoir Area, China by using Abs 355 . In addition, some indicators calculated by specific absorbance values can help interpret DOC quality in various ecosystems (Hansen et al, 2016; Liu et al, 2021). For example, SUVA 254 , SUVA 260 , and C:C ratio denotes the abundance of aromatic, hydrophobic, and coloured humic compounds in DOC, respectively (Liu et al, 2019; Wallage et al, 2006; Weishaar et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

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Changes in quantity and quality of dissolved organic carbon in purple soil: Roles of land use and soil depth

Liang

et al. 2022

Land Degrad Dev

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Dissolved organic carbon (DOC) is the substrate for microbial activities and regulates the biogeochemical cycle of carbon. Considerable areas of croplands have been converted to secondary forest and economic plantation following the implementation of Grain-for-Green Program projects in China, markedly altering the quantity and quality of topsoil DOC. However, the extent and magnitude of these land use changes affecting soil DOC remain largely unclear. This study aimed to elucidate the effects of different land uses and soil depths on topsoil DOC quantity and quality. Soil samples were collected from secondary forest (SF), orchards/plantations (OP), and cropland (CL) at 0-5, 5-10, 10-15, and 15-20 cm soil depths, respectively, from a representative purple soil hillslope, Southwest China. Soil DOC concentration and related UV-visible absorbance characteristics were determined to assesss respectively the quantity and quality of DOC. Results showed that DOC concentration was 44% lower in the OP than in the SF and CL. Higher ratios of UV absorbance value at 254, 260, and 400 nm to DOC concentration (i.e., SUAV 254 , SUVA 260 , and C:C ratio), electronic conductivity (EC), cation exchange capacity (CEC), soil organic carbon (SOC), and total nitrogen (TN) concentration were found in the OP rather than in the SF and CL. The SUAV 254 , SUVA 260 , SOC, and TN concentration were the highest at 0-5 cm soil depth. DOC concentration showed negative relationships with most UV absorbance values, SUAV 254 , SUVA 260 , and C:C ratio. Soil EC, CEC, and pH were closely correlated with the DOC concentration and its UV-visible variables. Our results indicated that DOC was relatively richer in aromatic and humic substances in the OP, providing valuable information for sustainable ecological restoration and land use management.

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“…MBC plays an important role in soil organic carbon dynamics and is an important indicator in detecting the soil carbon stability and nutrient dynamics after soil management practices (Liu et al 2016). Although DOC only accounts for https://doi.org/10.17221/29/2022-SWR < 0.25% of the total organic carbon, the water-soluble characteristics of DOC makes it readily available to microorganisms and, thus, has an important impact on organic carbon cycling in terrestrial ecosystems (Liu et al 2021). POC is an important carbon pool in soils, mainly composed of structural plant (i.e., lignin) and fungal matter (Rocci et al 2021;Witzgall et al 2021).…”

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confidence: 99%

Changes in soil organic carbon and its fractions under grassland reclamation in alpine-cold soils, China

Wu¹,

Yufu²,

Zhang³

et al. 2022

Soil & Water Res.

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Grasslands are the main land use types in China, but their reclamation into croplands can influence the terrestrial carbon and, consequently, impact the global carbon balance. The long-term reclamation of alpine-cold grasslands to croplands are expected to decrease the soil organic carbon (SOC) and its fractions. Here, we conducted an in situ systematic study to measure the SOC and its fraction in soils sampled in an alpine-cold grassland with a gradient of cultivation history from 0 to 40 years. The SOC and its fractions significantly decreased after reclamation (P < 0.05), and the changes in the 0–20 cm soil layer were the greatest among the three sampling depths. After 40 years of reclamation, the SOC content and storage at 0–20 cm decreased by 74 and 60%, respectively. The decreases in the soil labile carbon fractions were more rapid and apparent than the SOC, especially the particular organic carbon (POC), which decreased by 82%. The soil humus carbon fractions also decreased, particularly the humic acid carbon (HAC), which decreased by 81%. The reduction rates of SOC and its fractions gradually decreased with an increase in the cultivation history. Besides, the ratios of the optical densities or absorbances of humic acid (HA) and fulvic acid (FA) solutions at 465 and 665 nm (E<sub>4</sub>/E<sub>6</sub> ratios) and the hue coefficient (Δlog K values), which is the logarithm disparity between the 400 and 600 nm absorbance of the HA (FA) substance, in the solution gradually decreased, indicating that the quality of the soil humus decreased. The reclamation significantly decreased the SOC and its fractions in the alpine-cold soils, which should not be underestimated in the impact on the terrestrial carbon cycles and balance in the long run.

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Concentration and biodegradability of dissolved organic carbon derived from soils: A global perspective

Cited by 44 publications

References 58 publications

Relationships between riverine and terrestrial dissolved organic carbon: Concentration, radiocarbon signature, specific UV absorbance

Relationships between riverine and terrestrial dissolved organic carbon: Concentration, radiocarbon signature, specific UV absorbance

Changes in quantity and quality of dissolved organic carbon in purple soil: Roles of land use and soil depth

Changes in soil organic carbon and its fractions under grassland reclamation in alpine-cold soils, China

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