The earthworm gastrointestinal effect on the release of organic bound residues in soils

3rd International Conference on Energy Equipment Science and Engineering

Du, J.H.^1

State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai

200092, China^1

关键词: Chemical effect;    Desorption process;    Digestive activities;    Digestive enzymes;    Earthworm activities;    Organic contaminant;    Organic residues;    Physical effects;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/128/1/012039/pdf
DOI  :  10.1088/1755-1315/128/1/012039

来源: IOP

【 摘 要 】

Earthworm activities promote the release of bound residues and the digestive activities of earthworms contribute to the process. Earthworm digestive effects on bound residues can be divided into physical and chemical effects. Physical effects include gastrointestinal abrasion and mixing. The abrasion of soil and litter residues in earthworm gizzards and intestine can grind the food into fine particles, which increase the contact surface with microbial and promote the desorption of bound residues. Chemical effects are attributed to the secreted surfactant substances and digestive enzymes. The surfactants, especially at levels that lead to micellization, can enhance the desorption process of the organic contaminants that sored in the soil. The enzymes in earthworm digestive tracts can decompose the humus in soil, which may promote the release of organic residues that bind with humus.