Biochar is a carbon-rich material produced mainly from plant- and animal-based biomass through thermochemical conversion. It is often amended to soil for methane oxidation in landfill cover soil and for improving crop growth and yield by enhancing soil fertility. The application of biochar for removing organic and inorganic pollutants from soil and water is also well established. Biochar could be of potential use as an engineering material for enhancing the stability and performance of bioengineered structures that mainly consist of soil and vegetation. Bioengineered structures are commonly adopted in many parts of the world due to their multiple beneficial features. The stability and performance of these structures depend on the soil engineering properties and vegetation performance. However, the performance of vegetation is interrelated with the soil engineering properties. Therefore, the effects of biochar on soil engineering properties and vegetation performance, i.e., the soil-biochar-plant interaction, need to be studied and summarized. In the present study, the effect of biochar on the soil engineering properties and vegetation performance was reviewed. The review of the literature revealed that the amendment of biochar affects the soil engineering properties and vegetation performance by altering mainly soil pore system and fertility. However, this depends on many factors, such as soil type, biochar type, pyrolysis temperature, particle size of biochar, biochar amendment rate, aging of biochar, and the type of vegetation grown. Furthermore, the reviewed or existing literatures are mostly for agricultural soil, which is different from the soil state in bioengineered structures in terms of compaction density, suction range, and design life or duration. In addition, the properties of biochar are highly variable with its production process. Hence, the factors of soil state in bioengineered structures and the optimized production process of biochar need to be considered for maximizing the long-term performance of bioengineered structures.

生物炭是一种富含碳的材料，主要是通过基于热化学转化的动植物类生物质生产的。通常将其修改为土壤，以掩埋掩埋土壤中的甲烷氧化，并通过增强土壤肥力改善作物生长和产量。生物炭在土壤和水中去除有机和无机污染物的应用也已建立。生物炭可以潜在地用作工程材料，以增强主要由土壤和植被组成的生物工程结构的稳定性和性能。由于生物工程结构具有多种有益特性，因此在世界许多地方都普遍采用。这些结构的稳定性和性能取决于土壤工程特性和植被性能。然而，植被的性能与土壤工程特性有关。因此，需要研究和总结生物炭对土壤工程特性和植被性能的影响，即土壤－生物炭－植物的相互作用。在本研究中，综述了生物炭对土壤工程特性和植被性能的影响。文献综述表明，生物炭的改良主要通过改变土壤孔隙系统和肥力来影响土壤工程特性和植被性能。但是，这取决于许多因素，例如土壤类型，生物炭类型，热解温度，生物炭的粒径，生物炭的改良率，生物炭的老化以及生长的植被的类型。此外，评论或现有的文献大多是针对农业土壤的，在压实密度，吸力范围以及设计寿命或持续时间方面，这与生物工程结构中的土壤状态不同。另外，生物炭的特性随其生产过程而变化很大。因此，为了最大化生物工程结构的长期性能，需要考虑生物工程结构中土壤状态的因素和生物炭的优化生产工艺。