The Development of Invasive Alien Plant Species Management In the Framework of Rehabilitation of Invaded Ecosystems at Gunung Gede and Pangrango National Park
S. Tjitrosemito, I. Wahyuni Msi, S. Bachri, SS. Tjitrosoedirdjo

Source: SEAMEO BIOTROP's Research Grant | 2019


Chimonobambusa quadrangularis (Franceschi) Makino, is an invasive alien bambu species, belonging to Poacae family , originated from China and Formosa (Suzuki 1978). However  this species was introduced from Japan  around 1920 to Cibodas Botanical Gardens (Widjaja 2001). It spreads vegetative via the belowground rhizome carrying bud in each nodes. Mutaqien et al. (2011) suggested  that this bambu invaded Gunung Gede and Pangrango National Park, since this bambu has been utilised as the fence separating the Cibodas Botanical Garden area.   Driven by this recommendation activities were organised and researches were designed to study the control and the eradication of this bambu. A factorial experimental design was carried out combining two factors,  one was slashing of bambu culm consisting of 2 levels, i.e. slashing the culm by leaving  (1) one nodes, and (2) slashing culm leaving 3 nodes.  The second factor was  tretments consisting of 4 levels, (1). Slashed at monthly interval, (2). after slashing the cut culms were immediatelly brushed with 10% triclopyr disolved in diesel oil, (3). 2 months after slashing the growing shoot  were sprayed with equivalent glyphosate at 6 l/ha in 400 l water/ha with a knapsack sprayer, (4), slashing at 2 months interval. The experiment was carried out in GGPNP on an area dominated by bambu kersik under the trees of rasamala (Altingia exelsa). The combined treatments were 8 and replicated 3x tgiving a total of 24 plots. The plots were 2x 3 m2 delineated around by a ditch of 25 cm wide. C.quadrangularis (bambu kersik) is a strongly rhizomatous perennial bambu which proliferates well  under the condition of mild environment of Pangrango Mountain. even under the shade of trees.   Due to its rhizomatous growth form and intermingling of different genets, C. quadrangularis  genets are very difficult to identify in the field.  The bambu culm density in plot varied from 26 -62 culms/plot, statistically they were not different significantly with the mean 39.29 ±9.9 culms/plot. slashing followed by brushing with triclopyr at 10% disolved in diesel oil was good enough to control the growth of bambu culm, Two months after treatments, analysis of Variance on data of total  living bamboo culms in each plots indicated  no interactions among the factors, but each factors affected the number of living bambu  culms significantly. The mechanism of expansion was deliberatly  proposed. Another set of observation was done at another location to have a duplicate. Three  bambu kersik community sites of different ages are to be identified, and selected as plots, these plots shall be widely apart and the sampling metods will be carried out  as the following: 1. Two line transect of 50 m are laid randomly in each plot. 2. A single bambu kersik culm along the tansect will be selected at random and a kuadrat of 1 x 1 m is laid perpendicular to the transectat an interval of 10 m. 3. The sampling will be carried out from August to October each month to obtain a representative distribution of ramet, rhizome, bud and tillers.
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