Objective] This study was conducted to evaluate the product quality and safety of Peristrophe roxburghiana_ col ected from different places in Hechi City, northwest of Gunagxi, so as to provide basic data for further development and uti-lization of the characteristic plant resource P. roxburghiana. [Method] Contents of 9 kinds of heavy metals including Cd, Mn, Pb, Zn and Cu in the herb were deter-mined by the method of wet digestion-flame atomic absorption spectrophotometry and atomic fluorescence spectrometry, respectively. [Results] Heavy metal contents of Cd, Mn, Pb, Fe, Cu, Zn, As, Hg and Se were 1.62-17.25, 8.93-142.53, 4.37-18.43, 103.7-242.81, 2.55-5.35, 85.40-146.30, 0.07-0.54, 0.00-0.08 and 0.00-0.47 mg/kg, respectively. According to the national food safety standards and Green Trade Standards of lmporting ＆amp; Exporting Medicinal plants ＆amp; Preparations, the heavy metal contents of the P. roxburghiana_samples col ected from different coun-ties in Hechi City exceeded standards or at the critical values. Among which, Cd, Pb and Zn contents of the samples are seriously higher than the standards. [Con-clusion] Therefore, the impact of soil heavy metal pol ution on the safety of edible plants in the northwest of Guangxi should be highly concerned.
为促进石漠化地区绿色发展,利用废弃菌糠为栽培基质,研究了菌糠发酵过程温度的变化,及其在不同压力处理条件下的保水特性,并以任豆种子为试验材料,测定其在纯菌糠基质和菌糠-黏土-尾矿混合基质中的发芽率和发芽势,以及幼苗移栽野外后的成活率和植株高度,探讨石漠化地区植被恢复的技术和方法。结果表明:(1)废弃菌糠经发酵处理4周后即可以作为栽培基质使用;(2)粘土和菌糠以1∶4的质量比混合时,栽培基质的粘结效果较好;(3)冲压成型压力对栽培基质料块的保水性和任豆种子发芽率均有一定的影响,冲压力为50 k N时,任豆种子在纯菌糠基质的发芽率和发芽势较高,冲压力为20 k N时,7∶2∶1质量比的菌糠-粘土-尾矿混合基质中,任豆种子的发芽率和发芽势较高;(4)纯菌糠基质或黏土-菌糠-尾矿混合基质,均可作为任豆幼苗栽培的基质使用,但后者的效果比前者更好;(5)对废弃菌糠进行必要的发酵处理,适当添加黏土、尾矿或其它基质,并对移栽后的幼苗进行有效的护理,不仅可以提高移栽成活率,还可以保证苗木质量。
