| Summary: | 博士 === 國立中興大學 === 森林學系所 === 99 === In recently years, numerous studies have focused on assessing the capacity biomass accumulations for woody plants in the world after the “Kyoto Protocol” because biomass accumulations within plant bodies play a important role in the global carbon cycle. In general, carbon storage within woody plant bodies can be predicted through the percent carbon content (PCC) as the PCC were known for certain plant and it was widely used to estimate carbon storage for plants. Since, biomass prediction is essential and important tasks to evaluate the capacity of carbon storage for forest. The allometric relationships between biomass and diameter at breast height (DBH) of individual trees were widely applied to predict timber forests and were based the allometric equation. Numerous studies have predicted woody plant biomass through the allometric relationship and found that this relationship may vary with species, ages and site. Some of studies tried to induce a general law for using in differnt species, such as WBE model. The purpose of this study was using this conception to examine the suitability of the allometric equations in woody plant of Taiwan. The study site was located in central Taiwan and the aboveground biomass samples were obtained including China fir (Cunninghamia lanceolata (Lamb.) Hook.), Taiwan red cypress (Chamaecyparis formosensis Matsum.), Japanese cedar (Cryptomeria japonica D. Don), Makino bamboo (Phyllostachys makinoi Hayata.) and moso bamboo (Phyllostachys heterocycla). I tried to combine the samples of these species in order to develop an allometric relationship which can be suitable for woody plant of Taiwan area. The five allometric equations were adopted to predict these samples, namely, the general allometric equation, the WBE (I) allometric equation, the WBE (II) allometric equation, the Global allometric equation and the Ruark allometric equation. The results showed that the WBE (I) allometric equation (Y = 0.1000 ×DBH2.6700) and Global allometric equation (Y = 0.1424 ×DBH2.3679) had largest RMSE (493.14 and 132.32). Moreover, the general allometric equation (Y = 0.0960 × DBH2.3390), WBE (II) allometric equation ( Y = 0.0290 ×DBH2.6700) and Ruark allometric equation (Y = 0.0130 × DBH3.1510 exp-0.024×DBH) had a near RMSE (33.39-37.5). It was implicated that the parameter fixed model of WBE (I) allometric equation and Global allometric equation were not suitable for species. Whereas, the parameter b was fixed (2.67) and the parameter a was predicted as 0.0290, the RMSE were obviously reduced as 37.57. This result showed that plants also that the parameter b use 2.67 whereas supported the theoretical model of the WBE (II) allometric equation while the parameter a may vary with species and the ages of plant conditions.
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