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- W2372419796 abstract "The purpose of this paper is to examine the effects of earthworms on the microorganisms and enzyme activities in the Zn-treated soils which planted with the ryegrass.The Zn treated soils were prepared as follow process:each pot contained 1.0 kg air-dried soil,and ZnSO4 solution was added to each pot to provide levels of 0,100,200,300,and 400 mg Zn kg?1 soil.After thor-ough mixing,the soil,having a 70% water holding capacity,was incubated at 25°C in a greenhouse for 2 months to allow the Zn to redistribute among the various zinc fractions and to be stabilized.Each pot received 0.173 8 g KH2PO4 and 0.166 6 g urea as macro-nutrients.Two days later,the appropriated pots were inoculated with Zn-tolerant earthworms(3.6 g/pot),and the other pots without earthworms were set as the control.To avoid the escape of earthworms,overhanging adhesive tape was attached to the rim of each pot.Two days after the earthworm inoculating,10 seeds of ryegrass were planted into the soils.The plants were harvested after a growth period of 30 days,the soil was collected and stored at 4 ℃ for microbes and enzymes studies.Results show that the sucrase and urease activity were restricted by Zn contaminated,while phosphatase activity was not affected.Microbial biomass carbon in-creased in soil with low Zn(Zn ≤ 300 mg·kg-1)but decreased in soils with higher Zn levels.After introducing earthworms,the popu-lation of microbe and antinomyces,and the activities of sucrase,urease and phosphatase all enhanced significantly(p0.05*).As Zn polluted degree increased,the increment of enzymes activity by earthworm was not in the same order for different enzymes.It was found that polluted soil contented more soil NH4+-N、NO3--N than unpolluted soil and the amount of NO3--N was increased by earthworm significantly(p0.01**).We also found there were significant correlations between NO3--N and shoot biomass,shoot Zn contents and shoot Zn uptake(r =0.517*,r =0.532*,r =0.607*).This may be one of the reasons that earthworm could elevate the phytoremediation efficiency of plants in Zn polluted soil." @default.
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- W2372419796 date "2006-01-01" @default.
- W2372419796 modified "2023-09-23" @default.
- W2372419796 title "Effects of the earthworms on the microorganisms and enzyme activities in the Zn polluted soil" @default.
- W2372419796 hasPublicationYear "2006" @default.
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