生物炭对花岗岩砖红壤团聚体稳定性及其总碳分布特征的影响

通过不同浓度生物炭处理进行海南花岗岩砖红壤的小区试验,研究生物炭对花岗岩砖红壤水稳性团聚体以及土壤总碳的影响。结果表明:18个月后,与对照相比,0.5%或1.0%生物炭处理的水稳性团聚体几何平均直径(GMD)分别提高15.64%和10.80%;大于5 mm水稳性团聚体含量分别增加98.75%和88.37%。1.0%生物炭处理下的3~5 mm,2~3 mm和0.5~1 mm粒级水稳性团聚体总碳含量比对照分别增加32.24%,39.31%和306.36%;1.0%生物炭处理下>5 mm粒级的水稳性团聚体的总碳分配比例比对照增加90.44%。综合分析认为,生物炭对改善花岗岩砖红壤团聚结构、增加土壤总碳含量有积极意义。

Effects of Biochar on Stability and Total Carbon Distribution of Aggregates in Granitic Laterite

Effects of biochar on soil water-stable aggregates and total carbon were investigated with three biochar treatments in Granitic Laterite. Eighteen months later, results showed that, compared with the control, the biochar treatments of 0.5% and 1.0% significantly increased geometric mean diameter (GMD) of water-stable aggregates by 15.64% and 10.80%. Both treatments increased the contents of >5 mm water-stable aggregates by 98.75% and 88.37%, respectively. The biochar treatment of 1.0% increased the total carbon of 3~5 mm, 2~3 mm and 0.5~1 mm water-stable aggregates by 32.24%, 39.31% and 306.36%, respectively, and increased the distribution proportion of total carbon in >5 mm water-stable aggregates by 90.44% compared with the control. Therefore, biochar was beneficial for latosol to improve soil structure and increase soil total carbon.