高雄六龜與台南白河兩地麻竹林之林齡結構與生物量比較

The stand structure and biomass of Dendrocalamus latifl orus plantations in Liukuei, Kaohsiung and Baihe, Tainan.

本試驗調查高雄六龜與台南白河地區麻竹（Dendrocalamus latifl orus）林分之生長及生物量。麻竹林分生長分布特性方面，兩地區之林分株數頻度皆以胸徑6 ~ 8 cm者佔最多；竹叢分布面積與林地面積比例，白河樣區之22.2 ± 0.6 %較六龜樣區之7.5 ± 3.6 %高；六龜樣區之竹叢數及竹稈數分別為每公頃111 ± 38叢（clumps ha-1）、1,117 ± 232稈（culms ha-1），竹叢數及竹稈數皆較白河樣區每公頃330 ± 60叢（clumps ha-1）、7,267 ± 643稈（culms ha-1）低，六龜樣區之竹叢稈數14 ± 3 稈（culms clump-1）較白河樣區22 ± 2稈（culms clump-1）少，但六龜竹叢大小為7.7 ± 5.0 m2 clump-1，較白河樣區7.2 ± 0.2 m2 clump-1大，六龜樣區之竹叢分布較不均勻；林分生長性狀方面，兩試驗地之平均胸徑差異不大，六龜與白河樣區分別為6.9 ± 2.6 cm、7.3 ± 1.7 cm，而六龜樣區之平均竹高為12.4 ± 3.5 m較白河地區之8.8 ± 1.8 m高；地上部乾重方面，六龜樣區因竹叢稈數低且竹叢數少，其地上部林分總生物量亦遠低於白河樣區，六龜與白河樣區之總生物量乾重分別為17.4 ± 2.7 ton ha-1 、94.5 ± 8.4 ton ha-1，其中六龜樣區各齡級之生長及生物量結果，4年生及以上之總生物量最高、且隨齡級遞減而減少，六龜麻竹林明顯出現生長衰退的現象。 This study investigated the plantations of ma bamboo (Dendrocalamus latifl orus) in Liukuei, Kaohsiung and Baihe, Tainan. Results show that, the frequency of bamboo culms both sites is the highest at 6 ~ 8 cm DBH class. The ratio of crown land area to bamboo, 22.2 ± 0.6% in Baihe is higher than 7.5 ± 3.6% in Liukuei. The number of clumps and culms are 111±38 clumps ha-1 and 1,117±232 culms ha-1 in Liukuei, 330 ± 60 clumps ha-1 and 7,267 ± 643 culms ha-1 that higher than in Baihe, respectively. The number of culms at 14 ± 3 culms clump-1 in Liukuei is lower than the number of culms at 22 ± 2 culms clump-1 in Baihe. But the size of clump at 7.7 ± 5.0 m2 clump-1 in Liukuei is bigger than the size of clump at 7.2 ± 0.2 m2 clump-1 in Baihe. The distribution of clumps in Liukuei is uneven. The average of diameter is not signifi cant between experimental sites. It is 6.9 ± 2.6 cm and 7.3 ± 1.7 cm respectively in Liukuei and in Baihe. The average hight of 12.4 ± 3.5 m in Liukuei is higher than 8.8 ± 1.8 m in Baihe. The above ground biomass, the amount of culms and clumps in Liukuei is lower than in Baihe. The above ground biomass in Liukuei and Baihe are 17.4 ± 2.7 ton ha-1 and 94.5 ± 8.4 ton ha-1, respectively. The above ground biomass of Liukuei at different age indicated that the old bamboo which is above age 4 is the highest on above biomass. The biomass of bamboo decreased gradually from age4 to age1. It appeared the symptom of recession in Liukuei.