Jankong P, Visoottiviseth P, Khokiattiwong S
Department of Biology, Mahidol University, Rama VI Road, Rachataewee, Bangkok 10400, Thailand.
Chemosphere. 2007 Aug;68(10):1906-12. doi: 10.1016/j.chemosphere.2007.02.061. Epub 2007 Apr 9.
In an attempt to clean up arsenic (As) contaminated soil, the effects of phosphorus (P) fertilizer and rhizosphere microbes on arsenic accumulation by the silverback fern, Pityrogramma calomelanos, were investigated in both greenhouse and field experiments. Field experiments were conducted in Ron Phibun District, an As-contaminated area in Thailand. Soil (136-269 microg As g(-1)) was collected there and used in the greenhouse experiment. Rhizosphere microbes (bacteria and fungi) were isolated from roots of P. calomelanos growing in Ron Phibun District. The results showed that P-fertilizer significantly increased plant biomass and As accumulation of the experimental P. calomelanos. Rhizobacteria increased significantly the biomass and As content of the test plants. Thus, P-fertilizer and rhizosphere bacteria enhanced As-phytoextraction. In contrast, rhizofungi reduced significantly As concentration in plants but increased plant biomass. Therefore, rhizosphere fungi exerted their effects on phytostabilization.
为了清理受砷污染的土壤，在温室和田间试验中研究了磷肥和根际微生物对银背蕨（Pityrogramma calomelanos）积累砷的影响。田间试验在泰国受砷污染地区农披汶县进行。在那里采集了土壤（含砷量为136 - 269微克/克）并用于温室试验。根际微生物（细菌和真菌）从生长在农披汶县的银背蕨根部分离得到。结果表明，磷肥显著增加了试验银背蕨的植物生物量和砷积累量。根际细菌显著增加了受试植物的生物量和砷含量。因此，磷肥和根际细菌促进了砷的植物提取。相比之下，根际真菌显著降低了植物中的砷浓度，但增加了植物生物量。因此，根际真菌对植物稳定化发挥了作用。
