Potential of globally distributed topsoil mid-infrared spectral library for organic carbon estimation
文献类型: 外文期刊
作者: Hong, Yongsheng 1 ; Sanderman, Jonathan 3 ; Hengl, Tomislav 4 ; Chen, Songchao 5 ; Wang, Nan 6 ; Xue, Jie 6 ; Zhuo, Zhiqing 7 ; Peng, Jie 8 ; Li, Shuo 9 ; Chen, Yiyun 10 ; Liu, Yaolin 10 ; Mouazen, Abdul Mounem 11 ; Shi, Zhou 6 ;
作者机构: 1.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Woodwell Climate Res Ctr, Falmouth, MA 02540 USA
4.OpenGeoHub Fdn, Agro Business Pk 10, NL-6708 PW Wageningen, Netherlands
5.ZJU Hangzhou Global Sci & Technol Innovat Ctr, Hangzhou 311200, Peoples R China
6.Zhejiang Univ, Inst Agr Remote Sensing & Informat Technol Applica, Coll Environm & Resource Sci, Hangzhou 310058, Peoples R China
7.Zhejiang Acad Agr Sci, Inst Digital Agr, Hangzhou 310021, Peoples R China
8.Tarim Univ, Coll Plant Sci, Alaer 843300, Peoples R China
9.Cent China Normal Univ, Coll Urban & Environm Sci, Wuhan 430079, Peoples R China
10.Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430079, Peoples R China
11.Univ Ghent, Dept Environm, Coupure Links 653, B-9000 Ghent, Belgium
12.Vytautas Magnus Univ, Fac Engn, Dept Agr Engn & Safety, Kaunas, Lithuania
关键词: Soil monitoring; Mid-infrared spectroscopy; Soil spectral library; Fractional-order derivative; Deep learning
期刊名称:CATENA ( 影响因子:6.2; 五年影响因子:6.4 )
ISSN: 0341-8162
年卷期: 2024 年 235 卷
页码:
收录情况: SCI
摘要: Accurate monitoring of soil organic carbon (SOC) is critical for sustainable management of soil for improving its quality, function, and carbon sequestration. As a nondestructive, efficient, and low-cost technique, mid-infrared (MIR) spectroscopy has shown a great potential in rapid estimation of SOC, despite limited studies of the global scale. The objective of this work was to use a globally distributed topsoil MIR spectral library with 33,039 samples to predict SOC using different modeling methods. Effects of nine fractional-order derivatives (FODs) on the predicted accuracy of SOC were evaluated using four regression algorithms (i.e., ratio index-based linear regression, RI-LR; partial least squares regression, PLSR; Cubist; convolutional neural network, CNN). Squareroot transformation to SOC data was performed to minimize the skewness and non-linearity. Results indicated FOD to capture the subtle spectral details related to SOC, leading to improved predictions that may not be possible by the raw absorbance and common integer-order derivatives. Concerning the RI-LR models, the optimal validation result for SOC was obtained by 0.75-order derivative, with the ratio of performance to inter-quartile distance (RPIQ) of 1.85. Regarding the full-spectrum modeling for SOC, the CNN outperformed PLSR and Cubist models, irrespective of raw absorbance or eight FODs; the best-performing CNN model was achieved by 1.25order derivative (validation RPIQ = 6.33). It can be concluded that accurate estimation of SOC using large and diverse MIR spectral library at the global scale combined with deep-learning CNN model is feasible. This global-scale database is extremely valuable for us to deal with the shortage of soil data and to monitor the soils at different geographical scales.
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