1. College of Environmental Engineering, Key Laboratory of Regional Environment and Eco-Remediation (Ministry of Education), Shenyang University, Shenyang 110044, China; 2. Shenyang Jianzhu University, College of Municipal and Environmental Engineering, Shenyang 110068, China
Abstract：In order to identify the behaviors of microplastics, heavy metals and their combined action on the growth characteristics of crop seeds, wheat (Triticum aestivum L) was selected as the experimental subject to conduct the research on the soil enriched microplastics polyethylene (mPE), polypropylene (mPP) (0, 10, 50, 100, 200, 500, 1000, 5000 and 10000mg/kg) and heavy metal cadmium (Cd) (0, 1 and 5mg/kg) single pollution toward seed germination respectively following by their combined effect. From the results derived from single pollution condition of Cd, low concentration of Cd exhibit promoted wheat germination accompanied by inhibition effect on high Cd concentration. Furthermore, both root and bud length displayed the inverse correlation with the Cd concentration. Under the single pollution condition of microplastic, the germination rate of mPE to wheat seeds basically showed a valley type that demonstrated two end are inhibited and medium concentration of mPE can promote the germination rate of wheat seeds. And low concentration of mPP exhibit promoted wheat germination accompanied by inhibition effect on high mPP concentration. In the experiment of microplastic and Cd combined pollution, the experiment result showed that microplastic and Cd compound pollution promoted elongation of wheat root and bud when compared to a single microplastic pollution control group. Under combined pollution, mPP promoted wheat root elongation and bud elongation more than mPE, and the concentration range was wider (0~1000mg/kg). The length of root and bud of wheat seeds contaminated pollute under mPE and Cd pollution (1mg/kg) was longer than that under mPE and Cd pollution (5mg/kg), but under the same conditions, the length of root and bud of wheat seeds contaminated with mPP and Cd pollution (1mg/kg) was shorter than that under mPP and Cd pollution (5mg/kg). The combined effect of microplastics and Cd on the germination, root and bud length of wheat seeds is generally shown as an accelerating effect, which relieves the toxic effect of a single pollutant to a certain extent.
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