Arbuscular Mycorrhiza On Atrazine Contaminated Soil Remediation

Atrazine is a widely used herbicide in our country. Despite its low mammalian toxicity, atrazine has the long residue period and hard to decompose which results in the contamination of environment. The biodegradation of Atrazine contaminated soil has been taken more and more seriously. Co-remediation of AM fungi-plant to contaminated soil has been used for a long period. This technology illustrates a good prospect of application for cleaning up the polluted soil because of the advantages of the low costs, saving soil resources, non-disruption of environment and non secondary pollution.Effects of symbiosis on the metabolism of atrazine in soil were investigated in a series of pot experiments using sorghum as the host plant inoculated with arbuscular mycorrhizal (AM) fungi Glomus intraradices(GI) and Glomus mosseae(GM) respectively while the non-inoculated as the control. The results show that the degradation of Atrazine in soil is higher in the non-inoculation soil than in that of inoculated by two AM fungi, and the degradation effect of GM is stronger than GI especially in the soil that Atrazine concentration is 150mg/kg.The root length, plant height and fresh weight of sorghum plant in condition of inoculation with the two AM fungi is obviously higher than that of the control. The results show that AM fungi could inoculate more than 65% with the root in the Atrazine contaminated soil up to 150mg/kg, while GM inoculation is stronger than that of the GI. The number of Fungi, Bacterial, Actinomycetes in the rhizosphere soil of the host plant inoculated with GM is more than GI, while the control the least. These indicated that AM fungi inoculation could promote the reproduction of rhizospheric microorganism. In addition, the activity of soil urease has significantly increased but catalase activity increase in the high atrazine concentration only.