應用不同方法推估桂竹人工林生物量之比較

Comparison of biomass prediction by various approaches for a makino bamboo (Phyllostachys makinoi Hayata) plantation

桂竹為臺灣原生種，具有很高的碳貯存潛力，本研究目的在於量化臺灣中部桂竹之林分直徑分布及推估其地上部生物量和碳貯存量。經由樣區之調查資料，採用Weibull機率密度函數量化桂竹林之直徑分布，並以Kolmogorov-Smirnov檢定檢測模擬結果之適合度，所得結果顯示此函數可有效量化桂竹林分之直徑分布。本研究結合Weibull機率密度函數與相對關係式（方法一）推估林分地上部生物量，並與傳統方法（方法二）進行比較，所得結果並無顯著差異性（t值＝2.749，p值＝0.051）。此外本研究採用生物量和各齡級碳含量百分比推估桂竹林不同齡級的地上部生物量和碳貯存量，其合計後所得之全林分生物量和碳貯存量分別為58.23±28.68和27.21±13.37Mg ha-1。本研究結果將可提供桂竹林碳貯存能力之參考。

Makino bamboo, a native bamboo in Taiwan, is one of the most important bamboo with a high potential in carbon storage. The purpose of this study was to quantify stand diameter distribution and to predict aboveground biomass and carbon storage for a makino bamboo forest in central Taiwan. The Weibull probability density function was employed to quantify diameter distribution and the goodness-of-fit was examined by Kolmogorov-Smirnov test. The results showed the Weibull function was suitable for quantifying diameter distribution of makino bamboo. We combined the Weibull function and allometric model (Approach I) to predict aboveground biomass and used this approach to compare with the traditional approach that only employ allometric model (Approach II). The results showed no significant difference between these two approaches (t-value=2.749, p-value=0.051). Moreover, we predicted the aboveground carbon storage based on different age classes by the carbon content and biomass. The aboveground biomass and carbon storage were predicted to be 58.23±28.68 and 27.21±13.37 Mg ha-1, respectively. The results of this study will provide concise information for makino bamboo forest management for carbon storage.