Xiao-bin Zhang

Nanjing Agricultural University, Nanjing, Jiangsu Sheng, China

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Publications (2)0 Total impact

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    ABSTRACT: Soil physicochemical properties play an important role in the efficiency of phytoremediation and soil arability after phytoremediation. Soil pot experiments were conducted to investigate the dynamic changes of physicochemical properties in phenanthrene (a representative of polycyclic aromatic hydrocarbons)-contaminated soil under wheat and clover intercropping. The results showed that plants improved the pH values of phenanthrene-polluted soil with a maximum variation pH of 0.61. The difference in pH between wheat/clover intercropping and wheat/clover single cropping was not significant. Soil organic matter, total nitrogen, available nitrogen, total phosphorus, available phosphorus, cation exchange capacity and available potassium decreased over the experiment period due to biodecomposition and plant root absorption. The intercropping of wheat and alfalfa accelerated the consumption of the above-mentioned nutrients. And the decrease percentages ranged from 5.24% to 57.85%, more than those of wheat or alfalfa only planted with decrease percentages between 6.29% and 39.09%. In particular, soil available nitrogen and availiable phosphorus decreased more than the other nutrients with a maximum reduction percentage of 57.85%. Therefore, the application of nitrogen and phosphorus must be paid more attention during phytoremediation of polycyclic aromatic hydrocarbon-contaminated soil in the wheat and alfalfa intercropping system.
    Huan jing ke xue= Huanjing kexue / [bian ji, Zhongguo ke xue yuan huan jing ke xue wei yuan hui "Huan jing ke xue" bian ji wei yuan hui.] 05/2011; 32(5):1462-70.
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    ABSTRACT: The dynamic changes of soil enzymatic activities during remediation of phenanthrene contaminated soil with clover or clover and wheat were investigated with pot experiments. Clover and wheat increased the activities of soil sucrase, polyphenol oxidase, urease and phosphatase with an increase rate in the range of 14.72%-46.52%, but inhibited the catalase activity with an inhibition rate in the range of 36.13%-94.79%. Sucrase and polyphenol oxidase reached the maximum activity values at the 14th day, and urease and phosphatase at the 21th day. Catalase got to the minimum activity value at the 7th day. In the light of these, catalase was relatively more sensitive to phenanthrene than the other enzymes, and could be employed as a key indicator to evaluate the risk of polycyclic aromatic hydrocarbon contaminated soil during remedying. Sucrase and polyphenol oxidase activities in wheat and clover intercropping system were significantly higher than in wheat or clover single-cropping system. Furthermore, there was a good negative correlation between catalase and sucrase (r = - 0.482), and polyphenol oxidase (r = -0.599), and urease (r = -0.329), and phosphatase (r = -0.297). Nonetheless, a good positive correlation existed among sucrase, polyphenol oxidase, urease and phosphatase. It is concluded that in the process of phytoremediation, soil enzymes can be employed as indicators for soil quality, it is not necessary to monitor each enzymatic activity, but to the activity of a key enzyme.
    Huan jing ke xue= Huanjing kexue / [bian ji, Zhongguo ke xue yuan huan jing ke xue wei yuan hui "Huan jing ke xue" bian ji wei yuan hui.] 12/2009; 30(12):3684-90.