CATAS/Danzhou Scientific Observing and Experimental Station of Agro-Environment, Ministry of Agriculture and Rural Afairs, Environment and Plant Protection Institute, Haikou, 571101, Hainan, People's Republic of China.
Hubei Key Laboratory of Soil Environment and Pollution Remediation, College of Resources and Environment, Huazhong Agricultural University, No. 1 Lion Hill Street, Hongshan District, Wuhan, 430070, People's Republic of China.
Environ Sci Pollut Res Int. 2020 Oct;27(28):35802-35813. doi: 10.1007/s11356-020-09840-8. Epub 2020 Jun 29.
The aim of this study is to evaluate the effects of biochar on the plant's growth. A pot experiment was carried out in our study. Rice straw-derived biochar were charred at two heating temperatures (400 °C/800 °C) and two oxygen-limited atmospheres (CO/N), respectively. The FESEM/EDS technique (field emission scanning electron microscopy with X-ray energy-dispersive spectroscopy) was used to study soils, biochar and plant samples. FESEM images indicated that the structure of the biochar was highly heterogeneous with larger macropores, which can enhance soil porosity. Fine soil mineral particles blocked the biochar inner pores and channels after returning biochar to soil. EDS analysis indicated that the Al and Fe contents increased on the surface of biochar after their returning, which reduced the toxicity of Al and Fe in the soil. The returning straw directly inhibited the growth of leaf-used lettuce. Four returning biochar all significantly improved leaf-used lettuce growth, and the effects of biochar prepared under 400 °C and a CO atmosphere were better than those prepared under 800 °C and a N atmosphere. Changes of nitrogen content in the biochar before and after their returning were consistent with the improvement of soil available nitrogen, and plant growth was positively correlated with the nitrogen content of biochar. This study explored the impact of biochar on soil nutrients and revealed the mechanism of biochar returning to the field to promote plant growth. It is of great significance in studying and improving the characteristics of soil nutrients.
本研究旨在评估生物炭对植物生长的影响。我们进行了一项盆栽实验。稻秆衍生的生物炭分别在两种加热温度（400°C/800°C）和两种限氧气氛（CO/N）下进行炭化。FESEM/EDS 技术（场发射扫描电子显微镜与 X 射线能量色散谱）用于研究土壤、生物炭和植物样本。FESEM 图像表明，生物炭的结构高度不均匀，具有较大的大孔，可增强土壤孔隙度。细土矿物质颗粒在将生物炭返回土壤后堵塞了生物炭的内部孔道和通道。EDS 分析表明，生物炭返回土壤后表面的 Al 和 Fe 含量增加，从而降低了土壤中 Al 和 Fe 的毒性。返回的稻秆直接抑制了叶用生菜的生长。四种返回的生物炭均显著促进了叶用生菜的生长，在 CO 气氛下 400°C 制备的生物炭的效果优于在 N 气氛下 800°C 制备的生物炭。生物炭返回前后氮含量的变化与土壤有效氮的提高一致，植物生长与生物炭的氮含量呈正相关。本研究探讨了生物炭对土壤养分的影响，揭示了生物炭返回田间促进植物生长的机制。这对于研究和改善土壤养分特性具有重要意义。
