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| Straw removal has a limited effect on decreasing cadmium concentration in soil |
| Received:March 09, 2021 |
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| KeyWord:straw removal;cadmium;field-based data;removal rate evaluation |
| Author Name | Affiliation | | ZHAO Fang-jie | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | ZHAO Xing-yu | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | TAO Yi-min | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | WANG Han-qing | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | WANG Peng | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China |
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| Abstract: |
| Straw removal is a widely used practice in low-moderately contaminated agricultural soils with the aim to remove heavy metals from the soils. However, there are few reports on the effectiveness of this practice. Here, we used field-based data reported in the literature to evaluate the potential of rice straw removal for reducing cadmium(Cd) concentration in soil. Straw Cd concentration correlated linearly and significantly with soil Cd concentration. The regression equation obtained and average straw biomass were used to estimate the amounts of Cd removal in straw from soils with 0.5~5 mg Cd·kg-1. Straw Cd removal represents 0.23%~0.37%(mean 0.27%) of the total Cd in the plow layer. Including Cd removal in rice grain increases the removal rate to approximately 0.30%. The results suggest that rice straw removal has a limited effect on decreasing cadmium concentration in soil. |
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