The degradation of pruned branch chips by white-rot fungus: The comparison of degradation manners according to the kinds of trees and fungus
2008
Takada Oikawa, N.(Azabu Univ., Sagamihara, Kanagawa (Japan). Coll. of Environmental Health) | Iwaki, M. | Oshida, T.
As a basic examination of composting of pruned branch chips, two kinds of chips: cherry tree (a broadleaf tree) chips and common spruce (a conifer) chips, have been inoculated with Pleurotus ostreatus (P.o.), Phanerochaete chrysosporium (P.c.), and Pycnoporus cinnabarinus (P.ci.) and the degradation degrees of the chips and the differences of the degradation products have been examined. The incubation was carried out under dark conditions at 30degC with 80% humidity for 120 days. Values of pH, EC, phosphoric acid (as P2O5), ammonium nitrogen, and sulfuric acid ions increased in all samples. When seen from the view point of tree classes, common spruce samples showed higher values than cherry tree samples in most items. The interpretation for this is probably that the white-rod fungus resolved quickly easily resolvable ingredients in common spruce leaves that had been pruned in the early spring and had gotten mixed into common spruce samples. For white-rot fungus, samples inoculated with P.ci. showed high values in many of the items and therefore P.ci. seemed to be effective in the resolution of easily resolvable ingredients. On the other hand, Klason lignin values decreased greatly in samples inoculated with P.o. and therefore P.o. seemed to be effective in the degradation of difficultly resolvable ingredients. In addition, it is probable that degradation advanced considerably as C/N ratio decreased to 29 and the value of lignin to 23% in the cherry tree samples inoculated with P.o.
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