Marine Agriculture Research Center, Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao, 266101, China.
Marine Agriculture Research Center, Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao, 266101, China.
Chemosphere. 2022 Jul;298:134191. doi: 10.1016/j.chemosphere.2022.134191. Epub 2022 Mar 3.
Soil acidification has become a major environmental and economic concern worldwide. Char materials (e.g biochar, hydrochar) have attracted considerable attention as soil amendments to restore degraded soil. However, the comparative study of biochar and hydrochar on plant growth in acidified soil is limited. In this study, a microcosmic experiment was used to compare the effect of biochar and hydrochar from cow manure (CBC, CHC) and reed straw (RBC, RHC) on the growth of lettuce in the acidified soil. CBC and RHC significantly increased and decreased the biomass of lettuce by 18.7% and 32.5% in the acidified soil, respectively. The increase of the lettuce growth by CBC primarily attributed to the enhancement of soil properties (SOM and pH) and soil nutrient content (Olsen-P, K, Ca, Mg, Zn, Fe and Mn). Moreover, CBC enhanced the microbial activity and complexity and increased the abundance of beneficial genera like Gemmatimonas, Ramlibacter and Haliangium, which improved soil health and might indirectly benefited the lettuce growth. Our findings highlighted the priority of char materials feedstock and preparation technology for remediating the acidified soil.
土壤酸化已成为全球范围内的主要环境和经济问题。炭材料（如生物炭、水热炭）作为土壤改良剂来修复退化土壤，引起了相当大的关注。然而，关于生物炭和水热炭对酸化土壤中植物生长影响的比较研究有限。在这项研究中，采用微宇宙实验比较了牛粪（CBC、CHC）和芦苇秸秆（RBC、RHC）来源的生物炭和水热炭对酸化土壤中生菜生长的影响。在酸化土壤中，CBC 和 RHC 分别显著增加和降低了生菜的生物量，增幅为 18.7%和降幅为 32.5%。CBC 促进生菜生长主要归因于土壤性质（SOM 和 pH）和土壤养分含量（Olsen-P、K、Ca、Mg、Zn、Fe 和 Mn）的提高。此外，CBC 增强了微生物活性和复杂性，并增加了有益属如 Gemmatimonas、Ramlibacter 和 Haliangium 的丰度，改善了土壤健康，可能间接地有利于生菜生长。我们的研究结果强调了炭材料原料和制备技术在修复酸化土壤方面的优先地位。
