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| Relationship between Cu and Zn speciations and key enzyme activity in the process of vermicomposting pig manure |
| Received:October 08, 2018 |
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| KeyWord:vermicomposting;pig manure;heavy metal;speciation;enzyme activity |
| Author Name | Affiliation | | ZHOU Dong-xing | College of Resources and Environmental Science, Northeast Agricultural University, Harbin 150030, China | | LI Jing | College of Resources and Environmental Science, Northeast Agricultural University, Harbin 150030, China | | NING Yu-cui | College of Resources and Environmental Science, Northeast Agricultural University, Harbin 150030, China | | JIN Cong-min | College of Resources and Environmental Science, Northeast Agricultural University, Harbin 150030, China | | WANG En-ze | College of Resources and Environmental Science, Northeast Agricultural University, Harbin 150030, China | | LI Xin | College of Resources and Environmental Science, Northeast Agricultural University, Harbin 150030, China | | LIU Duo | College of Resources and Environmental Science, Northeast Agricultural University, Harbin 150030, China |
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| Abstract: |
| In this research, semi-decomposed pig manure was used to study the relationship between heavy metal speciations and key enzyme activity during vermicomposting. The MBCR method was used to determine the speciations of cooper (Cu) and zinc (Zn). The key enzymes included urease, alkaline phosphatase, catalase, and invertase. The experiment involved four treatments with different earthworm densities for vermicomposting 2 kg of semi-decomposed pig manure. The treatment of the control (CK) only had 2 kg of substrate without earthworms. The earthworm substrate ratio for treatments T1, T2, and T3 was 1:40, 1:20, and 1:10, respectively. The results showed that, compared with CK, the contents of Cu in treatments T1, T2, and T3 decreased by 19.66%, 24.81%, and 26.41%, respectively, whereas the corresponding Zn contents in the treatments decreased by 10.82%, 14.34%, and 19.58%. The enzyme activity of invertase increased by 55.47%, 46.87%, and 34.83%, respectively; urease decreased by 42.02%, 26.73%, and 10.08%, respectively; alkaline phosphatase increased by 116.38%, 100.48%, and 94.65%, respectively; and dehydrogenase increased by 32.79%, 58.97%, and 53.87%, respectively, for T1, T2, and T3 treatments. The content of Cu and Zn in the vermicompost decreased, and the speciations of Cu and Zn tended to be stable in residual form. Furthermore, vermicomposting could significantly increase enzyme activity, which was inhibited by the oxidizable and reducible specifications of Cu and Zn, followed by the residual and acid-soluble specifications. Additionally, the water-soluble specifications of heavy metals had little effect on enzyme activity. |
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