Effects of differect fungi inocula on Pinus taiwaniensis needles decomposition

• Main Authors: Shu-Ling Ho, 何淑玲
• Other Authors: Chiang-Her Yen
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/72392341460719237178

碩士 === 國立中興大學 === 森林學系 === 91 === Abstract The purposes of this study are to examine the effects of different fungal inocula on pine needle decomposition to decrease the forest fire fuels accumulation. Microcosms containing sterile Pinus taiwaniensis needles were inoculated with 14 species of macrofungi (all Basidiomycetes isolated from in situ) together with 3 species of Ascomycetes and 1 species of Deuteromycetes isolated separately from interior and surface of pine needles in the laboratory. With the same time, litter bags inoculated with interior and surface fungi were placed in the litter layer of the pine plantation at Ta-Chia-His working circle. In all experiments, During the initial stages (0-2 months), the needle had the highest decomposition rate. The needles in microcosms were decomposed faster than those were in the field, it showed that the fungi had the potential ability to decompose pine needles under the suitable condition. For recalcitrant substrates, Basidiomycetes (isolated no. 1-3) showed the lowest remaining percentage (55 %) of extract with alcohol-benzene and 82.2 % of lignin, followed by those from Ascomycetes and Deuteromycetes. During the study period, the needles in microcosms inoculated with Basidiomycetes, the remaining mass had a significant negative correlation with C concentration (R2 = -0.218), the remaining percentage of C, N, P, K, Ca and lignin were decrease until the study end, the remaining percentage of Mg and extract with alcohol-benzene had no differences. However, those inoculated with Ascomycetes and Deuteromycetes, the remaining mass had a significant positive correlation with lignin concentration(R2 = 0.473), the remaining percentage of C, N, K and lignin were decrease until the study end. In the field, the needle decomposition was mainly affected by moisture. The significant positive correlation was existed between remaining mass and lignin concentration(R2 = 0.376), N concentration and extract with alcohol-benzene(R2 = 0.254). The remaining percentage of C, N, K and lignin were steady decreased until the study end. Based of the microcosms test, the decomposition abilities of Basidomycetes are batter than Ascomycetes and Deuteromycetes. However, further work involving the effects of different fungal inocula on pine needle decomposition in field is needed to confirm this conclusion.