Biouptake Responses of Trace Metals to Long-Term Irrigation with Diverse Wastewater in the Wheat Rhizosphere Microenvironment.
Wastewater irrigation is widely practiced and may cause serious environmental problems. However, current knowledge on the effects of long-term irrigation with wastewater from different sources on the biouptake of trace metals (TMs) in the rhizosphere zone by plants in farmlands is limited. Here, we analyzed wheat rhizosphere soil and wheat roots collected from a typical wastewater irrigation area in North China to evaluate the influence of wastewater irrigation from different sources on the bioavailability of trace metals in soils. Results showed that irrigation with tanning and domestic wastewater helped enhance the bioavailability of trace metals in rhizosphere soil by increasing the active organic carbon content, soil redox potential, and catalase activity, thus enhancing the proportion of the potentially bioavailable part of trace metal speciation. Conversely, irrigation with pharmaceutical wastewater can reduce the bioavailability of trace metals in rhizosphere soil by increasing total soil antibiotics and thus decreasing the proportions of bioavailable and potentially bioavailable parts of trace metal speciation. These findings can provide insights into the migration and transformation of trace metal speciation in soil rhizosphere microenvironments under the context of wastewater irrigation.
['Li|Renfei|R|', 'Zhang|Yuan|Y|', 'Yu|Hong|H|', 'Dang|Qiuling|Q|', 'Yu|Hanxia|H|', 'Xi|Beidou|B|0000-0002-1055-1581', 'Tan|Wenbing|W|']
D057914:Agricultural Irrigation D001682:Biological Availability D002681:China D004345:Drug Industry D007220:Industrial Waste D008670:Metals D018517:Plant Roots D058441:Rhizosphere D012987:Soil D012989:Soil Pollutants D013633:Tanning D014908:Triticum D062065:Waste Water
wastewater irrigation bioavailability trace metal speciation soil rhizosphere microenvironment soil physicochemical properties