II. Estimating Biomass in Bush or in Regenerated Vegetation
II-1 Plot/Setting a plot for measurement
A four-sided plot is to be set in a given targeted bush (Fig3). The length of the shortest side of this plot must be longer than that of the mean height of the shrubs within the plot. In other words, for the mean shrub height of 2m, the length of the shortest side of the plot must be more than 2m, in other words, the size of the plot is larger than 2m x 2m.
(Pic Setting a plot in the bush. Clearing grasses off around the plot before working is advisable. )
To avoid overestimating the biomass of the plot by what is known as edge effect, two or three meters in distance from the edge of the bush or open-canopy site must be excluded from measuring. Because the shrub growth at such a location is usually better than the mean growth of the plot due to the better sun light conditions.
All bushes above the ground in the plot must be cut and collected onto a vinyl sheet. The grasses must be separated from all the collected shrubs and the grasses must be collected into appropriate bags for weighing. The shrubs must be separated into stems and leaves if possible, and each must be put into separate bags (Fig3). The weight of each items and tare must be noted in the field note (appendix 5).
(Pic All bushes above the ground in the plot are cut and collect onto a vinyl sheet. )
The same procedure as mentioned in the above applies here in sampling and drying of grasses, shrub leaves and shrub stems.
Tools: The same tools as used previously are required here.
Fig 3 Setting a plot and cutting all plants in it. Separating them into grasses, shrub leaves and shrub stems.
©Japan Overseas Plantation Center for Pulpwood