【摘要】 为探究施加枣核粉末生物炭及其磷酸改性生物炭对盐碱土的改良效果，采用傅里叶变换红外光谱仪(FTIR)与扫描电子显微镜(SEM)分析生物炭结构及形貌，并布设小白菜盆栽试验，设置对照、施加过2 mm筛的枣核粉末、枣核生物炭及质量浓度0.1、0.3、0.5 g/L磷酸改性枣核生物炭，共6组处理，施加量均为土重的5%。施加生物炭3 d后，种植小白菜，28 d后收获，测定土壤理化性质及小白菜生物量。结果表明，与对照比较，枣核粉末处理显著降低土壤pH值2.20%(P<0.05),电导率显著增加23.16%(P<0.05),有机质、速效钾分别显著提高34.37%、19.64%(P<0.05);与对照比较，枣核生物炭处理速效钾、有机质分别显著提高18.90%、31.51%(P<0.05);与对照比较，0.5 g/L磷酸改性枣核生物炭处理土壤有机质、速效磷含量分别显著提高了45.15%、85.78%(P<0.05),0.5 g/L磷酸改性枣核生物炭处理小白菜生物量显著增加58.33%(P<0.05),枣核粉末处理次之，添加枣核生物炭处理显著降低小白菜生物量，降低了50.00%(P<0.05)。施加枣核粉末、枣核生物炭及磷酸改性枣核生物炭改善了盐碱土的理化性质及结构。更多还原

【Abstract】 To explore the improvement effects of applying jujube-pit powder biochar and its phosphoric acid modification on saline-alkali soil, Fourier Transform Infrared Spectroscopy(FTIR) and Scanning Electron Microscopy(SEM) were employed to analyze the structure and morphology of the biochar. A pot experiment with Chinese cabbage was conducted, featuring six treatment groups: a control group, groups treated with jujube-pit powder that had passed through a 2 mm sieve, jujube-pit biochar, and phosphoric acid-modified jujube-pit biochar at mass concentrations of 0.1 g/L,0.3 g/L,and 0.5 g/L. The application rate for all treatments was set at 5% of the soil weight. Three days after biochar application, Chinese cabbage was planted,and harvested 28days later.Subsequently,soil physicochemical properties and the biomass of Chinese cabbage were measured.The results showed that compared with the control group,the jujube-pit powder treatment significantly decreased the soil pH value by 2.20%(P <0.05),significantly increased the electrical conductivity by 23.16%(P <0.05),and significantly improved the organic matter and available potassium contents by 34.37% and 19.64%,respectively(P <0.05).Compared with the control group,jujube-pit biochar significantly increased the available potassium and organic matter contents by 18.90%and 31.51%,respectively(P <0.05).Compared with the control group,the application of 0.5g/L phosphoric acidmodified jujube-pit biochar significantly increased the soil organic matter and available phosphorus contents by 45.15% and 85.78%,respectively(P <0.05).Additionally,0.5g/L phosphoric acid-modified jujubepit biochar significantly increased the biomass of pak-choi by 58.33%(P <0.05),followed by jujube-pit powder.In contrast,the separate addition of jujube-pit biochar significantly decreased the biomass of pakchoi by 50.00%(P <0.05).Overall,the application of jujube-pit powder,jujube-pit biochar,and phosphoric acid-modified jujube-pit biochar improved the physicochemical properties and structure of saline-alkali soil.更多还原