Institute of Resource, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, 1 Weigang, Nanjing, 210095, Jiangsu, China.
Department of Soil Science, Nanjing Agricultural University, 1 Weigang, Nanjing, 210095, Jiangsu, China.
Environ Sci Pollut Res Int. 2021 Jul;28(26):34108-34120. doi: 10.1007/s11356-021-14119-7. Epub 2021 May 8.
As one of the most important nutrients for plant growth, phosphorus was often poorly available in soil. While biochar addition induced improvement of soil structure, nutrient and water retention as well as microbial activity had been well known, and the effect of biochar soil amendment (BSA) on soil phosphorus availability and plant P uptake had been not yet quantitatively assessed. In a review study, data were retrieved from 354 peer-reviewed research articles on soil available P content and P uptake under BSA published by February 2019. Then a database was established of 516 data pairs from 86 studies with and without BSA in agricultural soils. Subsequently, the effect size of biochar application was quantified relative to no application and assessed in terms of biochar conditions, soil conditions, as well as experiment conditions. In grand mean, there was a significant and great effect of BSA on soil available P and plant P uptake by 65% and 55%, respectively. The effects were generally significant under manure biochar, biochar pyrolyzed under 300 °C, soil pH <5 and fine-textured soil, and soils that are very low in available P. Being significantly correlated to soil P availability (R=0.29), plant P uptake was mostly enhanced with vegetable crops of high biomass yield. Overall, biochar amendment at a dosage up to 10 t ha could be a tool to enhance soil availability and plant uptake of phosphorus, particularly in acid, heavy textured P-poor soils.
作为植物生长最重要的营养物质之一,磷在土壤中往往难以被有效利用。生物炭的添加可以改善土壤结构、养分和水分保持以及微生物活性,这些已经得到了广泛的认可,但是生物炭土壤改良(BSA)对土壤磷有效性和植物磷吸收的影响尚未得到定量评估。在一项综述研究中,检索了截至 2019 年 2 月发表的 354 篇关于 BSA 下土壤有效磷含量和植物磷吸收的同行评审研究文章中的数据。然后建立了一个包含 86 项有和无 BSA 的农业土壤数据的数据库,共 516 组数据。随后,根据生物炭条件、土壤条件和实验条件,量化了生物炭应用的效应大小,并进行了评估。总的来说,BSA 对土壤有效磷和植物磷吸收的影响分别为 65%和 55%,具有显著且较大的效应。在有机肥生物炭、300°C 热解生物炭、土壤 pH<5 和质地细的土壤以及有效磷非常低的土壤中,这种效应通常是显著的。与土壤磷有效性显著相关(R=0.29),植物磷吸收主要随着生物量产量高的蔬菜作物而增加。总的来说,在高达 10 t/ha 的剂量下,生物炭改良可以成为提高土壤磷有效性和植物磷吸收的一种工具,特别是在酸性、质地重、磷贫的土壤中。