中药废渣生物炭对磷石膏理化性质及柳枝稷生长的影响

Effects of Biochar Derived from Chinese Medicine Waste on Physical and Chemical Properties of Phosphogypsum and Growth of Switchgrass

摘要: 磷石膏和中药废渣资源化利用迫在眉睫，然而迄今还未见关于使用中药废渣生物炭改良磷石膏种草的研究。为了找出中药废渣生物炭与磷石膏的合理配比，本研究开展盆栽试验，在磷石膏基质中分别添加0、1%、2.5%、5%、10%、20%中药废渣生物炭配制复合基质(每盆基质重量为2500 g)，以不添加生物炭的磷石膏为对照，待基质稳定后播种柳枝稷，于柳枝稷生长90天后分析基质理化特性、收集柳枝稷生长指标。结果表明：与对照相比，生物碳的加入明显提高了复合基质湿度、pH、有机质、速效氮、有效磷和有效钾的含量，增加了柳枝稷的高度、鲜重、干重、根冠比。总的来说，生物炭添加浓度为2.5%对磷石膏理化特性和柳枝稷生长有明显的促进作用。

Abstract: The resource utilization of phosphogypsum and traditional Chinese medicine waste is imminent. However, there is no research on the addition of biochar derived from traditional Chinese medicine waste to improve phosphogypsum grass planting. In order to find out the reasonable ratio of biochar derived from traditional Chinese medicine waste and phosphogypsum, a pot experiment was carried out in this study. Biochar derived from traditional Chinese medicine waste with the proportion of 0, 1%, 2.5%, 5%, 10% and 20%were added to the phosphogypsum matrix to prepare a composite matrix (the matrix weight per pot was 2500 g), and the phosphogypsum without biochar was used as a control. After the matrix was stable, switchgrass was sown. After 90 days of switchgrass growth, the physical and chemical properties of the matrix were analyzed and the growth indexes of switchgrass were collected. The results showed that compared with the control, the biochar addition significantly increased the humidity, pH, organic matter, available nitrogen, available phosphorus and available potassium content of the composite matrix, and increased the height, fresh weight, dry weight and root-shoot ratio of switchgrass. In general, the addition of 2.5% biochar derived from traditional Chinese medicine waste significantly promoted the physi-cochemical properties of phosphogypsum and the growth of switchgrass.