Institute of Agrophysics, Polish Academy of Sciences, Doświadczalna 4, 20-290, Lublin, Poland.
Sci Rep. 2021 Mar 11;11(1):5698. doi: 10.1038/s41598-021-85239-w.
There is limited information regarding the effect of biochar (BioC) on the fertility of fallow and grassland soils, as well as on the properties of their humic acids (HAs). The objective of this study was to evaluate with a 3-year field experiment the influence of BioC on the organic matter (OM) in Haplic Luvisol. BioC (obtained via wood waste pyrolysis at 650 °C) was applied to the soil of subplots under fallow and grassland at doses of 0, 1, 2 and 3 kg m. The soil samples were collected eight times. The physicochemical properties were determined for the soil and BioC by analysing the density, pH, surface charge, ash, and organic carbon content. Based on the changes in the structure of the HAs and their quantity in the soils, the chemical properties of the HAs were determined. The maximum BioC dose caused an increase in the content of C and HAs. BioC did not influence the humification degree coefficients of the HAs originated from fallow, whereas in the grassland, there were significant changes observed in these coefficient values, indicating that BioC may stimulate and accelerate the humification process of soil HAs. Increasing the BioC doses caused an increase in the soil's HA content, suggesting an increase in soil sorption capacity. The fluorescence data showed BioC addition to the soil caused an increase in the number of structures characterised by low molecular weight and a low degree of humification.
关于生物炭（BioC）对休耕和草地土壤肥力以及腐殖酸（HAs）特性的影响，相关信息有限。本研究的目的是通过为期 3 年的田间试验评估 BioC 对单粒片层淡棕钙土中有机质（OM）的影响。BioC（通过在 650°C 下对木质废料进行热解获得）以 0、1、2 和 3 kg m 的剂量应用于休耕和草地分样下的土壤中。共采集了 8 次土壤样本。通过分析密度、pH 值、表面电荷、灰分和有机碳含量，对土壤和 BioC 的物理化学性质进行了测定。根据土壤中 HA 结构的变化及其数量，确定了 HA 的化学性质。最大 BioC 剂量导致 C 和 HAs 含量增加。BioC 对休耕土壤的腐殖化度系数没有影响，但在草地中，这些系数值发生了显著变化，表明 BioC 可能刺激和加速土壤 HAs 的腐殖化过程。随着 BioC 剂量的增加，土壤 HA 含量增加，表明土壤吸附能力增强。荧光数据显示，向土壤中添加 BioC 会增加具有低分子量和低腐殖化程度特征的结构数量。
