Degradation effect of Acrophialophora yunnanensis on forest surface litter
[Objective]We investigated the degradation effect of Acrophialophora yunnanensis GZUIFR 22.409 on different types of forest surface litter,in order to use the fungi to promote the degradation of forest surface litter,reduce the load of forest surface litter and thus reduce the forest fire danger grade,which will provide the theoretical basis and basic data for the microbial degradation method to reduce the forest fuel load in Guizhou forest area.[Method]The litters of coniferous and broad-leaved forest were collected and treated with living fungi and crude enzyme of A.yunnanensis,respectively.The weight loss dynamics of the two types of surface litter were determined at 25℃and 80%relative humidity after setting up the table according to survey fuelbeds in the fields,and the degradation effects of the fungi and crude enzyme of A.yunnanensis on the two types of litter were analyzed.[Result]Both the fungi and the crude enzyme of A.yunnanensis could degrade two kinds of litters and all of them had the highest degradation rate at 16th day.For coniferous litter,the degradation rate of crude enzyme was 9.74%and that of the fungi was 13.14%.After fitting the degradation model,the degradation coefficient k of crude enzyme was 0.004,the degradation of t0.5 was 165 days,and the degradation of t0.95 was 740 days.The degradation coefficient k of the fungi was 0.005,the degradation of t0.5 was 131 days,and the degradation of t0.95 was 588 days.For broadleaved litter,the degradation rates of crude enzyme and the fungi was 15.76%and 15.37%,respectively.After fitting the degradation model,the degradation coefficient k of crude enzyme was 0.007,the degradation of t0.5 was 93 days and the degradation of t0.95 was 422 days,the degradation coefficient k of the fungi was 0.006,the degradation of t0.5 was 103 days and the degradation of t0.95 was 487 days.[Conclusion]Both the fungi and crude enzymes of A.yunnanensis had degradation effect on coniferous and broadleaf litter,and the degradation effect on broadleaved litter was better than that of coniferous litter.It can reduce the forest surface fuel load to a certain extent,and contribute to reducing the forest fire risk level in Guizhou forest area.Therefore,A.yunnanensis has a promising application in reducing litter loading on forest surface.
filamentous fungiforest litterdegradationdegradation modelforest fire risk
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