Three-dimensional modelling of soil organic carbon density and carbon sequestration potential estimation in a dryland farming region of China

Abstract

Soil organic carbon density (SOCD) and soil organic carbon sequestration potential (SOCP) play an important role in carbon cycle and mitigation of greenhouse gas emissions. However, the majority of studies focused on a two-dimensional scale, especially lacking of field measured data. We employed the interpolation method with gradient plane nodal function (GPNF) and Shepard (SPD) across a range of parameters to simulate SOCD with a 40 cm soil layer depth in a dryland farming region (DFR) of China. The SOCP was estimated using a carbon saturation model. Results demonstrated the GPNF method was proved to be more effective in simulating the spatial distribution of SOCD at the vertical magnification multiple and search point values of 3.0×10 6 and 25, respectively. The soil organic carbon storage (SOCS) of 40 cm and 20 cm soil layers were estimated as 22.28×10 11 kg and 13.12×10 11 kg simulated by GPNF method in DFR. The SOCP was estimated as 0.95×10 11 kg considered as a carbon sink at the 20-40 cm soil layer. Furthermore, the SOCP was estimated as -2.49×10 11 kg considered as a carbon source at the 0-20 cm soil layer. This research has important values for the scientific use of soil resources and the mitigation of greenhouse gas emissions.

Carbon Stock Assessment in Gypsum-Bearing Soils: The Role of Subsurface Soil Horizons

“…Thus, the calculation of SOC stocks based exclusively on surface horizons implies leaving as much as three quarters of the total SOC out of the SOC models, and somewhat less than 60% if the calculation is based on information from the top 30 cm. In this regard, Sun et al [53] indicate currently existing inaccuracies, as the SOC stock models are essentially based on two dimensions; that is, they take only one value of the surface layer as representative of the soil as a whole without considering the vertical effect, and they lack the SOC estimation based on data measured at different depths.…”

“…This leads to the main hypothesis of this work, according to which, sampling focused on the topsoil excludes most of the total SOC stock. This may lead to significant underestimations of current stocks of SOC, which may affect models of the future evolution of SOC [50][51][52] or soil carbon sequestration potential [53], since the mineralization of the C stocks will be slower than other dryland soils in similar conditions. These constraints determine insufficient knowledge of C stocks in critical regions, such as agricultural drylands, regarding the effects of climate change on these regions [54].…”

Viticultural Suitability Analysis Based on Multi-Source Data Highlights Climate-Change-Induced Decrease in Potential Suitable Areas: A Case Analysis in Ningxia, China

“…In addition, we quantified the threshold value of SOC ranging from 0.07 g/kg to 11 g/kg in potential suitable areas as well. Soil organic carbon (SOC) reflects the ability of sequestration of carbon, directly affecting the maintenance and improvement of soil fertility and, thus, is often recognized as an important index to evaluate soil fertility [65]. Cheng et al [66] demonstrated differences in grape composition associated with soil water and organic carbon.…”