磷石膏基质中添加辣椒秸秆生物炭对柳枝稷生长的影响

Effects of Biochar Produced from Chili Straw on Physicochemical Properties of Phosphogypsum and Switchgrass Growth

生物炭调节磷石膏作为能源植物生长基质,既可有效利用磷石膏,又可提供可再生能源。本文以磷石膏、辣椒秸秆生物炭、柳枝稷为供试材料,按0,1%,2.5%,5%,10%,20%质量比配置生物炭–磷石膏混合基质种植柳枝稷,研究生物炭对磷石膏栽培基质理化特性及柳枝稷生长的影响。结果表明:磷石膏栽培基质的含水量、pH、速效磷和速效钾随辣椒秸秆生物炭用量的增加而增加,碱解氮含量随生物炭用量增加呈先增加后降低趋势;辣椒秸秆生物炭用量介于2.5%~5%对柳枝稷生长有较好的促进作用。这说明适量的生物炭可以改良磷石膏,从而促进柳枝稷的生长。本实验结果为磷石膏及辣椒秸秆的资源化利用提供了一种有效途径。

Biochar regulating phosphogypsum as an energy plant growth substrate, not only can effectively utilize phosphogypsum, but also provide renewable energy. In this study, phosphogypsum, chili straw biochar and switchgrass were used as test materials. Switchgrass was planted with biochar-phosphogypsum mixed substrate at 0, 1%, 2.5%, 5%, 10% and 20% mass ratio. The effects of biochar on the physicochemical properties of phosphogypsum substitute and the growth of switchgrass were investigated. The results showed that the moisture, pH, available phosphorus and available potassium of the phosphogypsum substrate increased with the increasing the amount of chili straw biochar, and the alkali-hydrolyzable nitrogen content increased first and then decreased with the increase of the amount of biochar. The loads of chili straw biochar between 2.5%~5% have a good promoting effect on switchgrass growth. The results of our study showed that an appropriate amount of biochar can improve physicochemical properties of phosphogypsum substitute, and thereby promoting the growth of switchgrass. Therefore, in conclusion, our study provides an effective way for the resource utilization of phosphogypsum and chili straw.