Changes in soil organic carbon and total nitrogen stocks after conversion of meadow to cropland in Northeast China

Ding, Fan; Hu, Ya-Lin; Li, Lujun; Li, Ang; Shi, Shengwei; Lian, Pei-Yong; Zeng, De‐Hui

doi:10.1007/s11104-013-1827-5

Cited by 46 publications

(25 citation statements)

References 41 publications

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“…Our results showed that the C:N ratios of the whole soil profiles for the three land uses were similar, although some other researchers have reported that C:N ratios of cultivated soils were lower than those of forest soil due to lower C:N ratios of crop residue inputs and microbial decomposers in the subsoils [14]. A few studies found that land-use changes from natural grassland to cropland did not alter soil C:N ratios [70,71]. In the current study, we found trends of C:N ratio decreasing with soil depth in all land uses.…”

Section: Chemical Composition Of Carbon In Topsoils and Subsoilssupporting

confidence: 63%

Land–Use Changes Influencing C Sequestration and Quality in Topsoil and Subsoil

2019

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Soil capacity as a major carbon (C) sink is influenced by land use. Estimates of soil organic carbon (SOC) sequestration have mostly focused on topsoils [0–30 cm official Intergovernmental Panel on Climate Change (IPCC) soil depth]. We investigated SOC stocks and their quality as influenced by land-use changes. Soil samples were collected from five soil depths down to 100 cm of three adjacent fields each representing a different land use—forest, cassava, and rice paddy—in Northeast Thailand. Sequestration of SOC in topsoils under all land uses was higher, as indicated by SOC stocks (59.0–82.0 Mg ha−1) than subsoils (30–100 cm) (27.0–33.0 Mg ha−1). The soil profile (0–100 cm) of the forest had higher stocks of SOC and humic acid (115.0 and 6.8 Mg ha−1, respectively) than those of cultivated land uses [paddy (100.0 and 4.8 Mg ha−1, respectively) and cassava (87.0 and 2.3 Mg ha−1, respectively)], which accounted for an average 30% increase in SOC sequestration over those with only topsoil. Topsoils of the forest had higher humic acid content but narrower E4:E6 ratio [the ratio of absorbances at 465 nm (E4) and at 665 nm (E6)] of humic acids (2.8), indicating a higher degree of humification and stabilization than the cultivated soils (3.2–3.6). Subsoil C was higher quality, as indicated by the lower E4:E6 ratio of humic acids than topsoils in all land uses.

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Section: Chemical Composition Of Carbon In Topsoils and Subsoilssupporting

confidence: 63%

Land–Use Changes Influencing C Sequestration and Quality in Topsoil and Subsoil

2019

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“…Numerous studies based on local and plot or site scales have found that tillage may destroy the soil aggregate and intensify the mobilization and mineralization of soil organic matter, which can result in greater SOC export to aquatic systems (e.g., Chantigny, ; Ding et al, ; Don, Scholten, & Schulze, ; Liu et al, ; Xu et al, ). However, this conclusion may not be applicable at the basin scale in cases where irrigation significantly reduces the total discharge, as observed in this study.…”

Section: Discussionmentioning

confidence: 99%

Organic carbon transport in the Songhua River, NE China: Influence of land use

Sun

Han

et al. 2017

Hydrological Processes

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Carbon transported by rivers is an important component of the global carbon cycle. Here, we report on organic carbon transport along the third largest river in China, the Songhua River, and its major tributaries. Water samples were collected seasonally or more frequently to determine dissolved organic carbon (DOC) and particulate organic carbon (POC) concentrations and C/N and stable carbon isotopic ratios. Principal component analysis and multiple regression analysis of these data, in combination with hydrological records for the past 50 years, were used to determine the major factors influencing the riverine carbon fluxes. Results indicate that the organic carbon in the Songhua River basin is derived mainly from terrestrial sources. In the 2008-2009 hydrological year, the mean concentrations of DOC and POC were 5.87 and 2.36 mg/L, and the estimated fluxes of the DOC and POC were 0.30 and 0.14 t·km −2 ·year −1 , respectively. The riverine POC and DOC concentrations were higher in subcatchments with more cropland, but the area-specific fluxes were lower, owing to decreased discharge. We found that hydrological characteristics and land-use type (whether forest or cropland) were the most important factors influencing carbon transport in this system. Agricultural activity, particularly irrigation, is the principal cause of changes in water discharge and carbon export. Over the last 50 years, the conversion of forest to cropland has reduced riverine carbon exports mainly through an associated decrease in discharge following increased extraction of water for irrigation. KEYWORDS agricultural activity, land use, riverine organic carbon, stable carbon isotope, the Songhua River

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“…The establishment of either grassland or lands with perennial vegetation on degraded cropland has been proposed as an effective method for climate change mitigation since these land use types could increase SOC content and stock Heikkinen et al 2014). In contrast, soil loses its organic carbon into the atmosphere following the cultivation of the land that was previously covered by perennial vegetation (Karhu et al 2011;Ding et al 2013). In our study area, the land use and landscape were dramatically changed after the implementation of the GFG project.…”

Section: Dynamics Of Soc Stockmentioning

confidence: 99%

Dynamics of soil organic carbon stock in a typical catchment of the Loess Plateau: comparison of model simulations with measurements

Akujärvi

Lü

et al. 2014

Landscape Ecol

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Land use changes are known to significantly affect the soil C balance by altering both C inputs and losses. Since the late 1990s, a large area of the Loess Plateau has undergone intensive land use changes during several ecological restoration projects to control soil erosion and combat land degradation, especially in the Grain for Green project. By using remote sensing techniques and the Yasso07 model, we simulated the dynamics of soil organic carbon ( -2 yr -1 , which was comparable to other studies in the Loess Plateau. Forest and grassland showed a more effective accumulation of SOC than the other land use types in our study area. The Yasso07 model performed reasonably well in predicting the overall dynamics of SOC stock for different land use change types at both the site and catchment scales. The assessment of the model performance indicated that the combination of Yasso07 model and remote sensing data could be used for simulating the effect of land use changes on SOC stock at catchment scale in the Loess Plateau.

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Changes in soil organic carbon and total nitrogen stocks after conversion of meadow to cropland in Northeast China

Cited by 46 publications

References 41 publications

Land–Use Changes Influencing C Sequestration and Quality in Topsoil and Subsoil

Land–Use Changes Influencing C Sequestration and Quality in Topsoil and Subsoil

Organic carbon transport in the Songhua River, NE China: Influence of land use

Dynamics of soil organic carbon stock in a typical catchment of the Loess Plateau: comparison of model simulations with measurements

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