Effects of Decabromodiphenyl Ether on Enzyme Activities of Two Type Soils

Using different concentrations(1, 10, 50, 100, 500 mg/kg) of decabromodiphenyl ether(BDE-209) as the extra pollution source, the activity of hydrolase(urease, sucrase, phosphatase) of paddy soil and vegetable soil from 1 to 115 days was investigated. The results showed that the three soil enzyme activities were influenced differently in paddy soil and vegetable soil. The sucrase and urease activities of paddy soil were significantly enhanced at the first day, but the inhibitory effect occurred on acid phosphatase; the same phenomenon delay to 14 d for vegetable soil. Basically, in 1 to 50 mg/kg BDE-209 treatments, the promoting/inhibiting effect on enzyme activity enhanced with BDE-209 concentration increasing, but which in the 200 and 500 mg/kg BDE-209 treatments were not obvious. The dynamic change of urease activity in paddy soil had a significant correlation with the acid phosphatase activity, while the sucrase activity in vegetable soil had a significant correlation with the acid phosphatase activity. It suggested that the effect of BDE-209 on soil enzyme was related to soil media and the proper soil enzyme should be selected as pollution index of soil BDE-209 according to soil type and property.