The Study of Gaining More Detailed Variability Information of Soil Organic Carbon in Surface Soils and Its Significance to Enriching the Existing Soil Database
Abstract
:1. Introduction
2. Materials and Methods
2.1. Study Area
2.2. Soil Sampling and Laboratory Analysis
2.3. Calculation of the SOC Contents and Stocks
2.4. Calculation of the SOC Contents and Stocks in the Sub-Layers of Topsoil Using the Equal-Area Spline Model
2.5. Spatial Interpolation and Evaluation of its Accuracy
2.6. Statistical Analysis Software
3. Results
3.1. Mean SOC Contents and Stocks in Every 5-cm-Thick Sub-Layer of Topsoil
3.2. SOC Contents and Stocks in the 0–5, 5–10, and 10–15 cm Sub-Layers
3.3. Geostatistics Analysis of the SOC Contents and Stocks in the Various Sub-Layers
3.4. Interpolation Maps and Accuracy Evaluation of the Various Sub-Layers
4. Discussion
4.1. Differences in SOC Contents and Stocks among the Sub-Layers within the Topsoil
4.2. Ecological Significance of Revealing the Differences in the SOC of Each Sub-Layer
4.3. Significance for Enriching the Existing Soil Database
5. Conclusions
Author Contributions
Acknowledgments
Conflicts of Interest
References
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Soil Series | Sampling Layer | Texture (USDA) | pH | Organic Matter g·kg−1 | CaCO3 % | CEC § Cmol(+)/kg |
---|---|---|---|---|---|---|
Shiushui Homei | Tillage layer | Silty clay loam | 7.7 | 20.2 b † | 1.20 | 16.7 |
Tillage layer | Silt loam | 7.1 | 39.5 a | 0.40 | 17.6 |
Parameters | Sub-Layers a | N b | Min. | Max. | Mean c | Std. d | CV e | Skewness | Kurtosis |
---|---|---|---|---|---|---|---|---|---|
SOC content | ---------------g·kg−1---------------- | ||||||||
Lm | 646 | 3.02 | 51.7 | 20.5 b | 7.15 | 0.35 | 0.27 | 0.85 | |
L1 | 646 | 1.03 | 56.6 | 22.1 a | 8.07 | 0.36 | 0.29 | 0.96 | |
L2 | 646 | 2.74 | 53.4 | 21.0 b | 7.46 | 0.35 | 0.28 | 0.89 | |
L3 | 646 | 2.99 | 46.7 | 18.7 c | 6.31 | 0.34 | 0.26 | 0.73 | |
Bulk density | ---------------g·cm−3---------------- | ||||||||
Lm | 646 | 1.05 | 1.42 | 1.22 a | 0.06 | 0.047 | 0.67 | 0.90 | |
L1 | 646 | 1.01 | 1.43 | 1.19 ab | 0.06 | 0.054 | 0.71 | 1.10 | |
L2 | 646 | 1.04 | 1.42 | 1.21 c | 0.06 | 0.049 | 0.68 | 0.97 | |
L3 | 646 | 1.09 | 1.44 | 1.26 b | 0.05 | 0.042 | 0.59 | 0.67 | |
SOC stock | --------------kg·m−2-------------- | ||||||||
Lm | 646 | 0.21 | 2.72 | 1.23 b | 0.38 | 0.31 | 0.00 | 0.58 | |
L1 | 646 | 0.073 | 2.86 | 1.29 a | 0.41 | 0.32 | −0.04 | 0.68 | |
L2 | 646 | 0.194 | 2.77 | 1.25 ab | 0.39 | 0.31 | −0.01 | 0.61 | |
L3 | 646 | 0.215 | 2.55 | 1.16 c | 0.35 | 0.30 | 0.03 | 0.48 |
Parameters | Sub-Layers a | Model | C0 | Sill | C0/Sill | Range (m) | R2 |
---|---|---|---|---|---|---|---|
SOC contents | Lm | Spherical | 24.0 | 57.1 | 42.0 | 6920 | 0.995 |
L1 | Spherical | 33.4 | 72.9 | 45.8 | 6890 | 0.964 | |
L2 | Spherical | 26.8 | 62.3 | 43.0 | 6950 | 0.906 | |
L3 | Spherical | 17.8 | 44.9 | 39.6 | 7190 | 0.962 | |
SOC stocks | Lm | Spherical | 0.066 | 0.17 | 38.8 | 7240 | 0.922 |
L1 | Spherical | 0.084 | 0.20 | 42.0 | 7130 | 0.962 | |
L2 | Spherical | 0.072 | 0.18 | 40.0 | 7180 | 0.912 | |
L3 | Spherical | 0.052 | 0.14 | 37.1 | 7250 | 0.995 |
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Zhang, Z.; Li, J.; Tsui, C.-C.; Chen, Z.-S. The Study of Gaining More Detailed Variability Information of Soil Organic Carbon in Surface Soils and Its Significance to Enriching the Existing Soil Database. Sustainability 2020, 12, 4866. https://doi.org/10.3390/su12124866
Zhang Z, Li J, Tsui C-C, Chen Z-S. The Study of Gaining More Detailed Variability Information of Soil Organic Carbon in Surface Soils and Its Significance to Enriching the Existing Soil Database. Sustainability. 2020; 12(12):4866. https://doi.org/10.3390/su12124866
Chicago/Turabian StyleZhang, Zhongqi, Jingzhang Li, Chun-Chih Tsui, and Zueng-Sang Chen. 2020. "The Study of Gaining More Detailed Variability Information of Soil Organic Carbon in Surface Soils and Its Significance to Enriching the Existing Soil Database" Sustainability 12, no. 12: 4866. https://doi.org/10.3390/su12124866