以兩種方式培育的麻竹苗建立產筍林之生長與產筍量比較

The growth and shoot production of Dendrocalamus latiforus by different propagation methods

本研究以南投縣蓮華池地區麻竹產筍林為試驗對象，調查分株法及高壓法更新麻竹林分結構、竹稈生長特性、地上部生物量累積狀況及產筍量等差異。結果顯示，兩種更新法竹稈數皆呈現連年增加，其中2017年分株法每叢竹稈數（11±3 culms clumps-1）較高壓法（5±1 culms clumps-1）高，顯示分株法更新麻竹林每叢竹稈增加較快。兩種培育方式麻竹竹稈DBH（2017年）皆介於2-10 cm間，呈常態分布，超過40％樣竹DBH位於徑級4-5.9cm，其中分株苗栽植後第一年（2015年）平均DBH 2.6±0.8 cm，平均竹高4.7±1.6 m，第二年（2016年）平均DBH 4.8±1.7 cm，平均竹高6.1±1.9 m，竹稈生長有顯著增加，高壓苗由於先經過一年溫室培育，2016年平均DBH 4.2±1.4 cm，平均竹高5.8±1.9 m。2017年分株法更新麻竹林地上部生物量乾重29.5±5.5 ton ha-1，較高壓法23.2±3.4 ton ha-1高，兩種育苗方法1、2年生樣竹株數及地上部生物量乾重，皆明顯高於3年生，其中分株法由於竹稈數過多，竹農為了提高竹筍生產力，已經開始進行伐老竹作業。麻竹筍產量於7月最多，5月最少，分株法竹筍年採收量可達25.5 ton ha-1較高壓法16.2 ton ha-1高。 This study investigated the plantation of Ma bamboo (Dendrocalams latiforus) by off-set planting propagation and air layering propagation in Lienhuachih, Nantou. The results showed that, the number of culms increased by both propagation methods from 2015 to 2017. In addition, the culms in each clump grew faster in the off-set planting (11±3 culms clumps-1) than air layering (5±1 culms clumps-1) in 2017. The DBH of Ma bamboo culms were distributed between 2-10 cm with the highest frequency at 4-5.9 cm. The average of diameter and height of off-set planting was 2.6±0.8 cm and 4.7±1.6 m in 2015, and 4.8±1.7 cm and 6.1±1.9 m in 2016. The diameter and height growth were significant increase by off-set planting in 2016. Because the air layering bamboos were grown in the greenhouse for one year, the average of diameter and height was 4.2±1.4 cm, 5.8±1.9 m in 2016. The aboveground biomass of Ma bamboos of off-set planting and air layering were 29.5±5.5 ton ha-1 and 23.2±3.4 ton ha-1, respectively. The aboveground biomass at age 3 was lower than that at age 1 and age 2. Because too many of culms in off-set planting plantation were produced, bamboo famers would cut down old bamboo culms to increase productivity of bamboo shoots. The highest and lowest amount of Ma bamboo shoots production was in July and in May, respectively. The bamboo shoots production was 25.5 ton ha-1 yearly by off-set planting, higher than 16.2 ton ha-1 yearly by air layering.

This study investigated the plantation of Ma bamboo (Dendrocalams latiforus) by off-set planting propagation and air layering propagation in Lienhuachih, Nantou. The results showed that, the number of culms increased by both propagation methods from 2015 to 2017. In addition, the culms in each clump grew faster in the off-set planting (11±3 culms clumps-1) than air layering (5±1 culms clumps-1) in 2017. The DBH of Ma bamboo culms were distributed between 2-10 cm with the highest frequency at 4-5.9 cm. The average of diameter and height of off-set planting was 2.6±0.8 cm and 4.7±1.6 m in 2015, and 4.8±1.7 cm and 6.1±1.9 m in 2016. The diameter and height growth were significant increase by off-set planting in 2016. Because the air layering bamboos were grown in the greenhouse for one year, the average of diameter and height was 4.2±1.4 cm, 5.8±1.9 m in 2016. The aboveground biomass of Ma bamboos of off-set planting and air layering were 29.5±5.5 ton ha-1 and 23.2±3.4 ton ha-1, respectively. The aboveground biomass at age 3 was lower than that at age 1 and age 2. Because too many of culms in off-set planting plantation were produced, bamboo famers would cut down old bamboo culms to increase productivity of bamboo shoots. The highest and lowest amount of Ma bamboo shoots production was in July and in May, respectively. The bamboo shoots production was 25.5 ton ha-1 yearly by off-set planting, higher than 16.2 ton ha-1 yearly by air layering.