Abstract
This paper studies three existing detritus food chains: biogas digester-mushroom; houseflypond fish; and mushroom-earthworm. Crop residues and animal manure constituted the major part of the total inputs to the detritus food chains which converted non-economic products to economic products. In addition, the detritus food chains provided crops with a large amount of organic fertilizer. Energy conversion efficiency of the biogas digester-mushroom food chain was highest, up to 32.31%. Nutrient conversion efficiencies for the housefly-pond fish food chain were highest, up to 31.48% (N), 39.11% (P) and 7.64% (K). Nutrient loss rates for the housefly-pond fish food chain amounted to −9.51% (N), −59.08% (P) and −40.19% (K), which showed that the natural nutrient input to the food chain was more than the nutrient loss from the food chain. Production systems using the detritus food chains had a significant economic effect.
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