College of Resources, Environment and Materials, Guangxi University, Nanning 530004, China.
College of Forestry, Guangxi University, Nanning 530004, China.
Molecules. 2024 Jul 10;29(14):3268. doi: 10.3390/molecules29143268.
Soil biochar is a kind of organic matter rich in carbon, which is of great significance in soil fertility improvement, fertilizer type innovation and greenhouse gas emission reduction. In this paper, Mg-modified biochar was prepared by thermal cracking using rice straw and corn straw as raw materials. The Mg-modified biochar and unmodified biochar were fully mixed with prepared soil samples at the addition amounts of 0.5% (/), 1% (/) and 2% (/), respectively, and then simulated indoor soil cultivation experiments were carried out. The effects of magnesium ion-modified biochar and non-modified biochar on soil chemical properties and the effects of different amounts of biochar on soil properties were studied. The results showed that the yield of Mg-modified biochar from rice straw and corn straw, prepared by pyrolysis, was 65%, and the ash content was large. The pH of MG-modified corn stalk biochar (MCBC) is weakly basic (8.55), while the pH of MG-modified rice stalk biochar (MRBC) is basic (10.1), and their internal structures are slightly different. After the application of biochar prepared from rice straw and maize stover, soil indicators were determined. Compared to the control, the chemical properties of the treated soil samples were significantly improved, with an increase in soil pH, an increase in the content of effective nutrients, such as fast-acting potassium, fast-acting phosphorus and alkaline dissolved nitrogen, and an increase in the content of the total phosphorus and total nitrogen, as well as an increase in the content of organic matter. The Mg-modified biochar was generally superior to the unmodified biochar in improving soil fertility, at the same addition level. It was also found that the rice-straw biochar performed better than the corn-stover biochar and had a more obvious effect on soil improvement in terms of fast-acting potassium, ammonium nitrogen, nitrate nitrogen, total phosphorus and total nitrogen contents.
土壤生物炭是一种富含碳的有机物质，在提高土壤肥力、创新肥料类型和减少温室气体排放方面具有重要意义。本文以水稻秸秆和玉米秸秆为原料，采用热裂解法制备了 Mg 改性生物炭。将 Mg 改性生物炭和未改性生物炭分别以 0.5%（/）、1%（/）和 2%（/）的添加量与制备的土壤样品充分混合，然后进行室内模拟土壤培养实验。研究了镁离子改性生物炭和未改性生物炭对土壤化学性质的影响，以及不同添加量的生物炭对土壤性质的影响。结果表明，热解制备的水稻秸秆和玉米秸秆 Mg 改性生物炭的产率为 65%，灰分含量较大。Mg 改性玉米秸秆生物炭（MCBC）的 pH 值呈弱碱性（8.55），而 Mg 改性水稻秸秆生物炭（MRBC）的 pH 值呈碱性（10.1），其内部结构略有不同。施用水稻秸秆和玉米秸秆制备的生物炭后，测定土壤指标。与对照相比，处理土壤样品的化学性质得到了显著改善，土壤 pH 值升高，速效钾、速效磷和堿解氮等有效养分含量增加，总磷和总氮含量增加，有机质含量增加。在相同添加水平下，Mg 改性生物炭一般优于未改性生物炭，提高土壤肥力。还发现，水稻秸秆生物炭在速效钾、铵态氮、硝态氮、总磷和总氮含量方面对土壤改良的效果优于玉米秸秆生物炭，效果更为明显。
