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| Effects of biochar addition on soil-exchangeable base cations under simulated acid rain |
| Received:June 03, 2020 |
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| KeyWord:biochar;acid rain;leaching;exchangeable base cations |
| Author Name | Affiliation | E-mail | | ZHENG Mei-ying | Tobacco Research Institute of CAAS, Qingdao 266101, China | | | PENG Yu-long | Zunyi Branch of Guizhou Provincial Tobacco Company, Zunyi 563000, China | | | LIU Ming-hong | Zunyi Branch of Guizhou Provincial Tobacco Company, Zunyi 563000, China | | | LI Cai-bin | Bijie Branch of Guizhou Provincial Tobacco Company, Bijie 551700, China | | | HU Ben | Bijie Branch of Guizhou Provincial Tobacco Company, Bijie 551700, China | | | GENG Wei | Ankang Branch of Shaanxi Provincial Tobacco Company, Ankang 725000, China | | | ZHANG Jiu-quan | Tobacco Research Institute of CAAS, Qingdao 266101, China | | | YANG Ji-xin | Tobacco Research Institute of CAAS, Qingdao 266101, China | | | GUO Xian-feng | Tobacco Research Institute of CAAS, Qingdao 266101, China | | | ZHANG Ji-guang | Tobacco Research Institute of CAAS, Qingdao 266101, China | zhangjiguang@caas.cn |
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| Abstract: |
| The effects of biochar addition on soil-exchangeable base cations(Ca2+, Mg2+, K+, and Na+)under simulated acid rain conditions were studied via a soil column simulated experiment. A two-factor comprehensive test of three pH(3.5, 5.6, and 7.0)eluents and four levels of biochar(0, 0.5%, 1%, and 2%)additives were used in this study; a total of 12 soil treatment tests were conducted to determine the four base ions in a leaching solution and soil after leaching. The results showed that:In comparison to the treatment without biochar, higher levels of biochar additives(i.e., 2% and 1%)increased the total amount of base ion leaching under simulated acid rain. It was also observed that, the leaching loss of Ca2+ was the highest and Mg2+ was the least resistant to leaching. Utilizing the same amount of biochar, the total leaching amount of the four base ions decreased with the increase in the pH value of the eluent, and the total leaching amount of each base ion was the highest when the eluent pH value was 3.5. In tests conducted using the same soil sample(pH:3.5), the order of total leaching amounts of Ca2+, Mg2+, and K+ was 2% biochar treatment > 1% biochar treatment > no biochar treatment > 0.5% biochar treatment, whereas that of Na+ was 2% biochar treatment>no biochar treatment>1% biochar treatment>0.5% biochar treatment. Under the influence of acid rain leaching, in comparison to the treatment without biochar, the treatment with biochar could increase the soil pH value and decrease the exchangeable base ion content. When the biochar dosage was 2%, the enhancement effect of soil-exchangeable base ions was the best. After leaching, the content of the four basic ions in soil was Ca2+ > K+ > Mg2+ > Na+. With biochar addition, acid deposition also increased the leaching loss of soil base ions. However, compared to the treatment without biochar, adding biochar increased the pH value and content of base ions under the simulated acid rain condition, and this confirmed that the treatment with 2% biochar was the most effective. |
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