屏東萬隆農場楝樹之生長及CO2吸存量

Growth and CO2 Sequestration of Melia azedarach in Wan-Long Farm of Pingtung

陳忠義(Chung-I Chen) ； 王亞男(Ya-Nan Wang) ； 酈學文(Xiao-Wen Lih) ； 廖宜俊(Yi-Jun Liao) ； 余瑞珠(Jui-Chu Yu) ； 吳宗賢(Chung-Shien Wu)

《中華林學季刊》 46卷2期 (2013/06) Pp. 125-134

摘要

Forest is one of the major carbon sequestration sources in the world. As a result, attempts to assessing CO2 sequestrations of tree species have attracted much attention currently. In Taiwan, the majority of CO2 sequestration investigations were taken place in trees planting in mountain areas. However, little effort has been paid on estimating CO2 sequestrations of trees in plain areas. In this study, six growth factors were collected from Melia azedarach in Wan-Long farm for assessing CO2 sequestrations. Our results reveal that the average values of DBH are 6.34 cm, 7.56 cm(planted on 2003), 7.99 cm (planted on 2003), and 8.57 cm in 6-year-old, 7-year-old and 8-year-old trees, respectively. Approximately 33.50 and 26.62 CO2 Mg/ha were sequestrated by 8-year-old and 7-year-old trees of M. azedarach, respectively. Apparently, in terms of total CO2 sequestrations, trees of M. azedarach are relatively low when compared to other trees species investigated in previous studies. However, the rates of CO2 sequestrations per year are higher in M. azedarach than in other tree species. This finding implies that in Wan-Long farm, although the growth rate of M. azedarach is low in the initial afforestation, its ability of CO2 sequestration is elevated annually. The high R^2 values (all ＞ 0.83) indicate great confidence of obtained regression models. In addition, the regression models that only incorporates DBH values have the highest R^2 values (all ＞ 0.90), suggesting that incorporating only DBH values is feasible to assess carbon sequestrations of M. azedarach in Wan-Long farm. We conclude that in Wan-Long farm, the growth rate of M. azedarach is not good in the initial afforestation, which may result from poor soil fertility. Nonetheless, the long drought that M azedarach experienced may play a critical role for CO2 sequestrations of M. azedarach and requires to be investigated.

關鍵字

楝樹 ； 生長量 ； 碳吸存量 ； 平地造林

並列摘要

Forest is one of the major carbon sequestration sources in the world. As a result, attempts to assessing CO2 sequestrations of tree species have attracted much attention currently. In Taiwan, the majority of CO2 sequestration investigations were taken place in trees planting in mountain areas. However, little effort has been paid on estimating CO2 sequestrations of trees in plain areas. In this study, six growth factors were collected from Melia azedarach in Wan-Long farm for assessing CO2 sequestrations. Our results reveal that the average values of DBH are 6.34 cm, 7.56 cm(planted on 2003), 7.99 cm (planted on 2003), and 8.57 cm in 6-year-old, 7-year-old and 8-year-old trees, respectively. Approximately 33.50 and 26.62 CO2 Mg/ha were sequestrated by 8-year-old and 7-year-old trees of M. azedarach, respectively. Apparently, in terms of total CO2 sequestrations, trees of M. azedarach are relatively low when compared to other trees species investigated in previous studies. However, the rates of CO2 sequestrations per year are higher in M. azedarach than in other tree species. This finding implies that in Wan-Long farm, although the growth rate of M. azedarach is low in the initial afforestation, its ability of CO2 sequestration is elevated annually. The high R^2 values (all ＞ 0.83) indicate great confidence of obtained regression models. In addition, the regression models that only incorporates DBH values have the highest R^2 values (all ＞ 0.90), suggesting that incorporating only DBH values is feasible to assess carbon sequestrations of M. azedarach in Wan-Long farm. We conclude that in Wan-Long farm, the growth rate of M. azedarach is not good in the initial afforestation, which may result from poor soil fertility. Nonetheless, the long drought that M azedarach experienced may play a critical role for CO2 sequestrations of M. azedarach and requires to be investigated.

並列關鍵字

Melia azedarach ； Growth ； CO2 sequestration ； Plantation