Zheng S, Wang C, Shen Z, Quan Y, Liu X
a MOE Key Laboratory of Water and Sediment Sciences/State Key Lab of Water Environment Simulation, School of Environment , Beijing Normal University , Beijing , China.
Int J Phytoremediation. 2015;17(1-6):208-14. doi: 10.1080/15226514.2013.876968.
This study presents an efficient heavy metal (HM) control method in HM-contaminated wetlands with varied soil moisture levels through the introduction of extrinsic arbuscular mycorrhizal fungi (AMF) into natural wetland soil containing indigenous AMF species. A pot culture experiment was designed to determine the effect of two soil water contents (5-8% and 25-30%), five extrinsic AMF inoculants (Glomus mosseae, G. clarum, G. claroideum, G. etunicatum, and G. intraradices), and HM contamination on root colonization, plant growth, and element uptake of common reed (Phragmites australis (Cav.) Trin. ex Steudel) plantlets in wetland soils. This study showed the prevalence of mycorrhizae in the roots of all P. australis plantlets, regardless of extrinsic AMF inoculations, varied soil moisture or HM levels. It seems that different extrinsic AMF inoculations effectively lowered HM concentrations in the aboveground tissues of P. australis at two soil moisture levels. However, metal species, metal concentrations, and soil moisture should also be very important factors influencing the elemental uptake performance of plants in wetland ecosystems. Besides, the soil moisture level significantly influenced plant growth (including height, and shoot and root dry weight (DW)), and extrinsic AMF inoculations differently affected shoot DW.
本研究通过向含有本土丛枝菌根真菌（AMF）物种的天然湿地土壤中引入外源丛枝菌根真菌，提出了一种在土壤湿度不同的重金属污染湿地中有效控制重金属（HM）的方法。设计了一个盆栽试验，以确定两种土壤含水量（5%-8%和25%-30%）、五种外源AMF接种剂（摩西管柄囊霉、明球囊霉、透明球囊霉、幼套球囊霉和根内球囊霉）以及重金属污染对湿地土壤中芦苇（Phragmites australis (Cav.) Trin. ex Steudel）幼苗根系定殖、植物生长和元素吸收的影响。本研究表明，无论是否接种外源AMF、土壤湿度或重金属水平如何，所有芦苇幼苗的根系中都普遍存在菌根。似乎不同的外源AMF接种在两种土壤湿度水平下均有效降低了芦苇地上组织中的重金属浓度。然而，金属种类、金属浓度和土壤湿度也应是影响湿地生态系统中植物元素吸收性能的非常重要的因素。此外，土壤湿度水平显著影响植物生长（包括株高、地上部和根部干重（DW）），外源AMF接种对地上部DW的影响不同。
