Abstract

With pig manure and crop straw as the main components for its compost material, the study simulated five levels of heavy metal pollution by adding zinc to the compost material to make it separately have five zinc contents to research on the effects of zinc on the metabolisms and oxidation-reduction enzyme activities of microbe communities of the compost material at the different zinc contents under the aerobic and high-temperature condition. It showed that where the zinc contents of the compost material were separately 0, 300, 600 and 900 mg kg^-1, the carbon sources that differentiate the microbes of the material were polymers and carbohydrates; where the zinc contents of the compost material were separately 300, 600 and 900 mg kg^-1, the dehydrogenase activities of the material appeared unstable to some extent, possibly because the heavy metal had inhibitory effect to the dehydrogenase activity and the phenomenon of the “resisting enzyme activity” took place at the same time; where the zinc content of the compost material were separately 600 and 900 mg kg^-1, the material is conducive to humus condensation and aromatization and the carbon source uses of its microbes at the two zinc contents did not significantly differ; and the average polyphenol oxidase and dehydrogenase activities of the compost material at the zinc content of 600 mg kg^-1 were the highest, helpful to lignin degradation and its product transformation of the material as well as its microbe multiplication.

Key words: Pig manure, zinc, microbe community, oxidative, reductive enzyme.