Screening Major Properties of Biochar Affecting Acid Soil Amelioration Based on Pot Experiments and Random Forest Model
Screening Major Properties of Biochar Affecting Acid Soil Amelioration Based on Pot Experiments and Random Forest Model
复制标题
基于盆栽试验和随机森林模型筛选生物炭改良酸性土壤的主要性质
DOI：
10.1007/s42729-022-01010-8
复制
发表时间：
2022-09-28
影响因子：
3.9
通讯作者：
Pan, Genxing
中科院分区：
文献类型：
--
作者：
Ke, Xianlin;Wang, Yan;Pan, Genxing
生物炭的特性决定了其缓解土壤酸度和促进植物生长的能力;然而，其关键特性仍不清楚。因此，本研究的目的是筛选生物炭的关键特性，强烈影响土壤酸度和植物生长，以获得一个更好的估计生物炭特性，适合酸性土壤改良。本盆栽试验以小白菜为试验植物。以土壤酸度和小白菜生物量为指标，研究了不同有机废弃物生物质炭对酸性土壤的改良效果。采用皮尔逊相关系数和随机森林模型分析方法，研究了生物炭特性与土壤酸度和植物生长之间的关系。结果表明，生物炭的存在使土壤pH值改变了-0.2至1.7个单位，小白菜生物量产量增加了-6%至314%。Ca、Mg和P含量（重要性= 34.6%）、碱性表面官能团和BET表面积显著影响土壤酸度。生物炭的铁含量、溶解性有机碳（DOC）、电导率（EC）和微孔等特性对小白菜的生长起着关键性的促进作用，随机森林模型分析表明，上述特性的重要性达到53.9%。此外，本研究中使用的所有生物炭都提高了土壤肥力48.26 - 113.04%，小白菜的综合效益提高了34.14 - 180.11%，尤其是羊粪生物炭和骨粉生物炭。生物炭孔隙丰富，富含Ca、Mg、P、Fe，DOC和EC含量高，表面官能团呈碱性，有利于酸性土壤的改良和小白菜的生长。在酸性土壤上施用生物质炭是提高土壤肥力和蔬菜生产综合效益的有效途径。
The properties of biochar determine its ability to alleviate soil acidity and improve plant growth; however, its key properties remain unclear. Therefore, the purpose of this study was to screen the key characteristics of biochar that strongly influence soil acidity and plant growth to obtain a better estimation of biochar characteristics that is suitable for acid soil amelioration. Pak choi was selected as the experimental plant in this pot trial. Soil acidity and pak choi biomass were used to estimate the effect of biochar derived from different organic wastes on acid soil amelioration. Pearson’s correlation combined with a random forest model analysis was applied to investigate the relationship between the characteristics of biochar and soil acidity or plant growth. The results showed that the presence of biochar altered the soil pH by − 0.2 to 1.7 unit and pak choi biomass yield by − 6% to 314%. The Ca, Mg, and P contents (importance = 34.6%), basic surface functional groups, and BET surface area significantly affected the soil acidity. The properties of biochar, including the Fe content, dissolved organic carbon (DOC), electrical conductivity (EC), and micropores, played pivotal roles in promoting pak choi growth, and the importance of the above properties reached to 53.9% according to random forest model analysis. In addition, all biochars used in this study improved soil fertility by 48.26–113.04%, and the comprehensive benefits of pak choi improved by 34.14–180.11%, especially for sheep dung biochar and bone powder biochar. Biochars with rich pores, abundant Ca, Mg, P, and Fe, high DOC and EC, and basic surface functional groups are favorable for acid soil improvement and pak choi growth. Applying biochar to acid soils may be a promising way to improve the comprehensive benefits of soil fertility and vegetable production.