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| Regulation of phosphorus fractions and release risk upon biochar application in saline paddy soil |
| Received:June 18, 2019 |
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| KeyWord:biochar;paddy soil;P fractions;P sorption index;degree of P sorption saturation;environmental risk |
| Author Name | Affiliation | E-mail | | CAO Dian-yun | Agronomy College, Shenyang Agricultural University, Shenyang 110866, China
Liaoning Biochar Engineering&Technology Research Center, Shenyang 110866, China | | | LAN Yu | Agronomy College, Shenyang Agricultural University, Shenyang 110866, China
Liaoning Biochar Engineering&Technology Research Center, Shenyang 110866, China | lanyu312228@syau.edu.cn | | YANG Xu | Agronomy College, Shenyang Agricultural University, Shenyang 110866, China
Liaoning Biochar Engineering&Technology Research Center, Shenyang 110866, China | | | HE Tian-yi | Agronomy College, Shenyang Agricultural University, Shenyang 110866, China
Liaoning Biochar Engineering&Technology Research Center, Shenyang 110866, China | | | LIU Zun-qi | Agronomy College, Shenyang Agricultural University, Shenyang 110866, China
Liaoning Biochar Engineering&Technology Research Center, Shenyang 110866, China | | | CHEN Wen-fu | Agronomy College, Shenyang Agricultural University, Shenyang 110866, China
Liaoning Biochar Engineering&Technology Research Center, Shenyang 110866, China | | | CAI Dan-dan | Liaoning Branch of Fertilizer Chinese Company, Shenyang 110866, China | | | WEN Qiu-xiang | Huanren County Agricultural Development Service Center, Huanren 117200, China | 18904032450@163.com |
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| Abstract: |
| In order to investigate the effect of biochar application on phosphorus fractions and release risk of coastal meadow saline paddy soils, a field experiment was conducted to investigate soil P content, characteristics of P fractions, and P release risk under different biochar application rates(CK:0 t·hm-2;B1:20 t·hm-2;B2:40 t·hm-2). The results showed that biochar could increase the content of total P, Olsen-P, total organic P, and total inorganic P in soil by 11.40%~35.70%, 28.96%~46.63%, 11.30%~29.19%, and 10.54%~25.98%, respectively. Biochar increased the content of NaHCO3 soluble P(Ca2-P), NH4AC soluble P(Ca8-P), and NH4F soluble P(Al-P) in soil, and there was a significant positive correlation with biochar dosage. When biochar application was 20 t·hm-2, the content of NaOH-Na2CO3 soluble P(Fe-P) and occluded P(O-P) in soil reached the highest values. The application of biochar had no significant effect on H2SO4 soluble P(Ca10-P). Biochar significantly increased the content of soil labile organic P(LOP) and moderately labile organic P(MLOP), but significantly reduced the content of moderately resistant soil organic P(MROP). When the amount of biochar was 40 t·hm-2, the content of highly resistant soil organic phosphorus(HROP) reached the lowest value. In this experiment, soil Al(ox) and Fe(ox) were at a high level and the application of biochar significantly increased soil P sorption index(PSI) and increased the fixation capacity of soil P. Soil P adsorption saturation(DPSS) was only 6.81%~8.34%, and soil environmental risk index(ERI) was 54.55%~61.67%. In conclusion, the application of biochar can improve the P availability of salinized paddy soil, but do not increase the risk of soil P release under the conditions of this study. |
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