Effective soil thickness inversion in Xinanjiang River basin based on random forest and empirical Bayesian Kriging regression prediction algorithms

Wang Shangxiao; Zhang Xiaodong; Zhang Ming; Niu Xiaonan; Zhou Mo; Tang Zhimin; Zhang Jie; Zong Leli; Xu Shuai

doi:10.13961/j.cnki.stbctb.2025.01.018

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Effective soil thickness inversion in Xinanjiang River basin based on random forest and empirical Bayesian Kriging regression prediction algorithms

- Effective soil thickness inversion in Xinanjiang River basin based on random forest and empirical Bayesian Kriging regression prediction algorithms
- Bulletin of Soiland Water Conservation Vol. 45, Issue 1, Pages: 168-177(2025)
- 作者机构：
  
  1. 中国地质调查局南京地质调查中心,江苏,南京,210016
  2. 华南师范大学教育科学学院,广东,汕尾,516600
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2025.01.018
  CLC： S159
- Published：2025
- 稿件说明：
移动端阅览
Wang Shangxiao, Zhang Xiaodong, Zhang Ming, et al. Effective soil thickness inversion in Xinanjiang River basin based on random forest and empirical Bayesian Kriging regression prediction algorithms[J]. Bulletin of Soiland Water Conservation, 2025, 45(1): 168-177.
DOI：

Wang Shangxiao, Zhang Xiaodong, Zhang Ming, et al. Effective soil thickness inversion in Xinanjiang River basin based on random forest and empirical Bayesian Kriging regression prediction algorithms[J]. Bulletin of Soiland Water Conservation, 2025, 45(1): 168-177. DOI： 10.13961/j.cnki.stbctb.2025.01.018.

摘要

[目的

]

快速、准确地获取区域有效土壤厚度，分析其空间分布特征和影响因素，为植被生长、土壤保持和粮食安全工作提供理论指导。[方法

]

以新安江流域为研究区，将野外调查数据、地形、岩性和气候等成土因素结合起来，采用经验贝叶斯克里金回归预测(EBKRP)和随机森林(RF)算法，得到有效土壤厚度反演结果，并分析其与环境变量之间的关系。[结果

]

①区域平均有效土壤厚度为0.2～0.3 m，城镇建设集中和人类活动密集的盆地和平原区土壤厚度较高，丘陵山地区则较低。②从MAE(平均绝对误差)、R

(判定系数)和RMSE(均方根误差)3项精度评价指标来看，RF算法的预测结果明显优于EBKRP算法，而且更能显示出土壤厚度空间异质性分布特征，在一定程度上提高了土壤厚度数字制图的效果。③有效土壤厚度的估算受地形和气候变量的影响较大，它们分别占变量重要性的46.77%和18.78%。[结论

]

RF算法能够有效实现对区域有效土壤厚度的反演，克服了土壤厚度空间异质性的特点，相较于有限采样的模型更精确，分辨率也更高。

Abstract

[Objective] The effective soil thickness of a region was rapidly and accurately obtained

and its spatial distribution and influencing factors was analyzed

in order to provide theoretical guidance for vegetation growth

soil conservation

and food security. [Methods] Taking the Xinanjiang River basin as the research area

combining field survey data

topography

lithology

climate

and other soil-forming factors

the empirical Bayesian Kriging regression prediction (EBKRP) and random forest (RF) algorithms were applied to obtain the effective soil thickness inversion results. The relationship between this data and environmental variables was also analyzed. [Results] ① The average effective soil thickness in the region ranged from 0.2 to 0.3 m. Soil thickness was higher in basin and plain areas with concentrated urban development and intensive human activity. Meanwhile

it was lower in hilly and mountainous regions. ② Based on three accuracy evaluation indicators of MAE (mean absolute error)

R2 (coefficient of determination)

and RMSE (root mean square error)

the prediction results of the RF algorithm were significantly better than those of the EBKRP algorithm. It could more effectively show the spatial heterogeneity distribution of soil thickness

improving the effect of soil thickness digital mapping. ③ The effective soil thickness estimation was strongly influenced by topography and climate variables

which accounted for 46.77% and 18.78% of the variable importance

respectively. [Conclusion] The RF algorithm could effectively invert regional effective soil thickness

overcoming the spatial heterogeneity of soil thickness

and is more accurate and has a higher resolution compared to models with limited sampling.

关键词

Keywords

references

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