Impacts of Rice–Rape Rotation on Major Soil Quality Indicators of Soil in the Karst Region
Abstract
:1. Introduction
2. Materials and Methods
2.1. The Experiment Material
2.2. Data Source and Sample Analysis
2.3. Evaluation of Heavy Metals in Soils
3. Results
3.1. Changes in the Physiochemical Properties of the Soil during Rice–Rape Rotation
3.1.1. Changes in the Mechanical Composition
3.1.2. Changes in pH
3.1.3. Changes in Redox Potential
3.1.4. Changes in Soil Organic Matter
3.2. Changes in the Heavy Metal Content of the Soil during Rice–Rape Rotation
3.2.1. Changes in the Cr and Cd Content of the Soil
3.2.2. Changes in the Pb and Cu Content of the Soil
3.3. Evaluation of the Soil Pollution by Heavy Metals in Rice–Rape Rotation
4. Discussion
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Soil Depth | Index | Soil Organic Matter | Eh | pH | Pb | Cu | Zn | Cr | Cd |
---|---|---|---|---|---|---|---|---|---|
Mean | 56.19 | 10.2 | 7.8 | 44.54 | 19.54 | 81.72 | 56.19 | 1.41 | |
0–20 cm | Standard deviation | 2.38 | 12.62 | 0.09 | 4.37 | 1.22 | 1.23 | 2.38 | 0.13 |
Coefficient of variation (%) | 4.24 | 123.73 | 1.15 | 9.81 | 6.24 | 1.51 | 4.24 | 9.22 | |
Mean | 41.03 | 29.2 | 8.07 | 38.14 | 18.59 | 69.49 | 80.61 | 1.88 | |
20–40 cm | Standard deviation | 2.64 | 6.72 | 0.1 | 4.63 | 0.69 | 0.57 | 1.58 | 0.06 |
Coefficient of variation (%) | 6.43 | 23.01 | 1.24 | 12.14 | 3.71 | 0.82 | 1.96 | 3.19 |
Particle Size | 0–20 cm | 20–40 cm |
---|---|---|
Clay particles | 18.97 | 23.85 |
Fine silt | 12.43 | 16.76 |
Medium silt | 15.81 | 16.44 |
Coarse silt | 35.21 | 34.06 |
Fine sand | 14.96 | 6.64 |
Coarse and medium sand | 2.64 | 2.26 |
Soil Depth | Particle Size | Growth Period of Rape | Growth Period of Rice | Average Value | Coefficient of Variation | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Pre-Sowing | Seedling | Bolting | Flowering | Harvesting | Pre-Sowing | Seedling | Tillering | Filling | Harvesting | ||||
0–20 | Clay particles | 18.97 | 17.25 | 24.46 | 11.16 | 10.26 | 19.76 | 17.68 | 16.69 | 18.51 | 16.43 | 17.12 | 22.61 |
Fine silt | 12.43 | 14.98 | 18.11 | 16.23 | 16.37 | 13.42 | 16.12 | 21.37 | 17.37 | 19.14 | 16.55 | 15.12 | |
Medium silt | 15.81 | 17.87 | 18.62 | 17.55 | 15.23 | 20.49 | 19.66 | 17.52 | 17.37 | 18.51 | 17.86 | 8.44 | |
Coarse silt | 35.21 | 32.53 | 31.82 | 33.67 | 26.43 | 30.37 | 30.99 | 31.15 | 29.74 | 27.87 | 30.98 | 7.94 | |
Fine sand | 14.96 | 15.25 | 5.47 | 19.28 | 29.59 | 14.44 | 13.67 | 11.81 | 15.13 | 16.49 | 15.61 | 36.96 | |
Coarse and medium sand | 2.64 | 2.13 | 1.51 | 2.11 | 2.11 | 1.53 | 1.88 | 1.46 | 1.88 | 1.56 | 1.88 | 19.03 | |
20–40 | Clay particles | 23.86 | 17.28 | 30.55 | 14.32 | 10.52 | 30.06 | 30.89 | 30.42 | 27.87 | 20.28 | 23.60 | 30.44 |
Fine silt | 16.76 | 15.64 | 19.11 | 16.36 | 21.65 | 20.49 | 17.37 | 17.21 | 18.72 | 18.82 | 18.21 | 9.87 | |
Medium silt | 16.44 | 17.68 | 19.21 | 15.65 | 10.52 | 27.87 | 19.45 | 18.15 | 16.22 | 15.91 | 17.71 | 23.40 | |
Coarse silt | 34.06 | 31.59 | 28.72 | 33.14 | 34.83 | 16.43 | 28.70 | 30.63 | 29.12 | 30.37 | 29.76 | 16.47 | |
Fine sand | 6.64 | 14.05 | 0.79 | 18.22 | 20.26 | 2.95 | 1.21 | 1.68 | 5.39 | 12.83 | 8.40 | 82.91 | |
Coarse and medium sand | 2.26 | 3.76 | 1.61 | 2.31 | 2.23 | 2.20 | 2.38 | 1.91 | 2.67 | 1.79 | 2.31 | 24.37 |
Soil Depth | Element | Growth Period of Rape (Pi) | Growth Period of Rice (Pi) | PZ | Class of Pollution | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Pre-Sowing | Seedling | Bolting | Flowering | Harvesting | Pre-sowing | Seedling | Tillering | Filling | Harvesting | ||||
0–20 | Cr | 0.28 | 0.29 | 0.31 | 0.30 | 0.34 | 0.32 | 0.31 | 0.31 | 0.21 | 0.19 | 0.31 | Security |
Cd | 2.35 | 2.78 | 2.88 | 2.86 | 2.59 | 2.26 | 3.01 | 2.88 | 0.95 | 0.79 | 2.70 | Moderate pollution | |
Pb | 0.13 | 0.12 | 0.11 | 0.10 | 0.12 | 0.15 | 0.14 | 0.14 | 0.14 | 0.16 | 0.15 | Security | |
Cu | 0.20 | 0.18 | 0.18 | 0.17 | 0.20 | 0.29 | 0.30 | 0.30 | 0.12 | 0.14 | 0.26 | Security | |
Zn | 0.27 | 0.25 | 0.27 | 0.24 | 0.27 | 0.25 | 0.25 | 0.25 | 0.25 | 0.25 | 0.26 | Security | |
20–40 | Cr | 0.32 | 0.34 | 0.33 | 0.31 | 0.31 | 0.34 | 0.33 | 0.36 | 0.22 | 0.20 | 0.33 | Security |
Cd | 3.14 | 1.76 | 2.09 | 3.22 | 2.81 | 2.62 | 2.64 | 2.66 | 1.01 | 0.88 | 2.79 | Moderate pollution | |
Pb | 0.11 | 0.07 | 0.11 | 0.09 | 0.09 | 0.14 | 0.16 | 0.12 | 0.15 | 0.16 | 0.14 | Security | |
Cu | 0.19 | 0.21 | 0.20 | 0.19 | 0.19 | 0.27 | 0.28 | 0.27 | 0.14 | 0.13 | 0.24 | Security | |
Zn | 0.23 | 0.26 | 0.25 | 0.24 | 0.23 | 0.23 | 0.23 | 0.25 | 0.24 | 0.26 | 0.25 | Security |
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Fang, H.; Yan, Q.; Zhang, Z.; Wang, D.; Huang, X. Impacts of Rice–Rape Rotation on Major Soil Quality Indicators of Soil in the Karst Region. Int. J. Environ. Res. Public Health 2022, 19, 11987. https://doi.org/10.3390/ijerph191911987
Fang H, Yan Q, Zhang Z, Wang D, Huang X. Impacts of Rice–Rape Rotation on Major Soil Quality Indicators of Soil in the Karst Region. International Journal of Environmental Research and Public Health. 2022; 19(19):11987. https://doi.org/10.3390/ijerph191911987
Chicago/Turabian StyleFang, Hui, Qiuxiao Yan, Zhenming Zhang, Daoping Wang, and Xianfei Huang. 2022. "Impacts of Rice–Rape Rotation on Major Soil Quality Indicators of Soil in the Karst Region" International Journal of Environmental Research and Public Health 19, no. 19: 11987. https://doi.org/10.3390/ijerph191911987