黄土丘陵沟壑区坡面土壤水碳分布与状态空间模拟

Spatial Distribution of Soil Water and Carbon on the Slopes of the Hilly and Gully Loess Plateau and Its Simulation with State-Space Modeling

  • 摘要:
    目的 黄土高原是中国重要的生态功能区,也是水土流失严重的地区,土壤水分和土壤有机碳对生态建设具有重要意义。本研究聚焦于黄土丘陵沟壑区桥沟流域坡面,探究该区域土壤水分含量和土壤有机碳含量的分布情况及其模拟结果。
    方法 研究采用了线性回归模型和状态空间方程两种方法,量化了土壤水碳与相关环境因素之间的相互关系,并对比了两种方法的性能。
    结果 结果表明,土壤水分含量与有机碳含量、电导率和海拔之间存在显著相关性,且这些变量在空间分布上表现出自相关性。状态空间方程在模拟土壤水碳空间分布方面相较于传统线性回归模型具有明显优势,能够更准确地捕捉变量间的空间关系和交互效应。状态空间方程的决定系数(土壤水分含量R2最高为0.904,土壤有机碳含量R2最高为0.992)普遍高于线性回归模型的决定系数(土壤水分含量R2最高为0.548,土壤有机碳含量R2最高为0.312),同时均方根误差(RMSE)低于线性回归模型。
    结论 状态空间方程在模拟土壤水分含量和土壤有机碳含量的空间分布上具有更高的准确性和可靠性,这一研究结果为黄土高原坡面尺度的土壤水分含量和有机碳含量分布与模拟研究提供了精确和可靠的方法。

     

    Abstract:
    Objective The Loess Plateau is an important ecological functional area in China and also a region with severe soil erosion. Soil water content and soil organic carbon are of great significance for ecological restoration. This study focused on the slope of the Qiaogou watershed in the hilly and gully region, aiming to explore the distribution and simulation of soil water content and soil organic carbon (SOC) in the area.
    Method The study employed two methods, linear regression model and state-space equation, to quantify the relationship between soil water content / SOC and related environmental factors, and compared the performance of the two methods.
    Result Results indicated that there was a significant correlation between soil water content, SOC, electrical conductivity, and altitude, and these variables exhibited autocorrelation in the spatial distribution. The state-space equation was found to outperform over traditional linear regression models in simulating soil water content and SOC, as it more accurately captured the spatial relationships and interaction effects between variables. The determination coefficients of the state-space model (the highest R2 for soil water content was 0.904, the highest R2 for SOC was 0.992) were generally higher than those of the linear regression model (the highest R2 for soil water content at 0.548, the highest R2 for SOC was 0.312), while the root mean square error (RMSE) was lower than that of the linear regression model, indicating that the state-space model had a higher accuracy and reliability in simulating the spatial distribution of soil water content and SOC.
    Conclusion The research results provided accurate and reliable methods for studies into the distribution and simulation of soil water content and organic carbon at the slope scale of the Loess Plateau.

     

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