Abstract：
Most hyperaccumulators cannot maintain vigorous growth throughout the year, which may result in a low phytoextraction efficiency for a few months. In the present study, rotation of two hyperaccumulators is proposed to address this issue. An 18-month field experiment was conducted to evaluate the phytoextraction efficiency of Cd by the monoculture and rotation of Celosia argentea and Sedum plumbizincicola. The results showed that rotation increased amount of extracted Cd increased by 2.3 and 1.6 times compared with monoculture of C. argentea and S. plumbizincicola. In rotation system, the biomass of S. plumbizincicola and Cd accumulation in C. argentea increased by 54.4% and 40.7%, respectively. Rotation reduced fallow time and increased harvesting frequency, thereby enhancing Cd phytoextraction. Planting C. argentea significantly decreased soil pathogenic microbes and increased the abundances of plant growth-promoting rhizobacteria (PGPR) and 1-aminocyclopropane-1-carboxylate (ACC) deaminase genes, which may be beneficial for the growth of S. plumbizincicola. Planting S. plumbizincicola increased the abundance of sulfur oxidization (SOX) system genes and decreased soil pH (p < 0.05), thereby increasing the Cd uptake by C. argentea. These findings indicated that rotation of C. argentea and S. plumbizincicola is a promising method for promoting Cd phytoextraction.
摘要：
大多数超蓄积者不能全年保持旺盛的增长,这可能导致几个月的植物提取效率低。在本研究中,提出了两个超累加器的旋转来解决这个问题。进行了为期18个月的田间试验，以评估通过单一栽培和旋转的celosiaargentea和景天plumbizincicola对Cd的植物提取效率。结果表明，与C.argentea和S.plumbizincicola的单一培养相比，旋转增加的Cd提取量分别增加了2.3和1.6倍。在旋转系统中，S.plumbizinicola的生物量和C.argentea中Cd的积累分别增加了54.4％和40.7％，分别。旋转减少了休耕时间，增加了收获频率，从而提高Cd的植物提取率。种植C.argentea显着降低了土壤病原微生物，并增加了植物生长促进根际细菌（PGPR）和1-氨基环丙烷-1-羧酸盐（ACC）脱氨酶基因的丰度，这可能对S.plumbizincicola的生长有益。种植S.plumbizinicola增加了硫氧化（SOX）系统基因的丰度，降低了土壤pH值（p<0.05），从而增加了C.argentea对Cd的吸收。这些发现表明，旋转C.argentea和S.plumbizinicola是一种有前途的促进Cd植物提取的方法。
