tailieunhanh - Management of Organic Waste Part 4

Tham khảo tài liệu 'management of organic waste part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Vermicomposting Composting with Earthworms to Recycle Organic Wastes 37 decreases in microbial activity were reported in casts of Ell. eitgeiiiae and E. fetida fed on pig and cow manures respectively Aira et al. 2006 Aira Dominguez 2009 . Control Fig. 7. Changes in microbial activity assessed by fluorescein diacetate hydrolysis after the passage of cow manure through the gut of the earthworm species Eisenia tmdrei. Values are means SE. Control is the manure incubated without earthworms. How does the earthworm species affect microbial communities Earthworms of different functional groups or even different species within the same functional group have a particular mode of food selection ingestion digestion assimilation and movement thus their importance in mixing decomposition or nutrient release as well as in the structure and activity of microbial communities will vary both qualitatively and quantitatively Curry Schmidt 2007 . To determine how the earthworm species shape the relationships between earthworms and microorganisms during the active phase of vermicomposting we performed an experiment with mesocosms filled with cow manure and inoculated with 10 mature individuals of the earthworm species Eisenia andrei Eisenia fetida and Periơnyx excavatiis. The mesocosms consisted of 2 L plastic containers filled to three quarters of their capacity with sieved moistened vermiculite. A plastic mesh was placed over the surface of the vermiculite and 200 g fresh weight fw of the substrate was placed on top of the mesh to avoid mixing the substrate with the vermiculite bedding. The mesocosms were covered with perforated lids and stored in random positions in an incubation chamber at 20 C and 90 relative humidity. Control mesocosms consisted of each type of manure incubated without earthworms. Each treatment was replicated three times. The length of the active phase depends greatly on the rates at which the earthworms ingest and process the substrate Dominguez et al. 2010

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