Shrubs

Shrubs are woody plants that are usually short, often less than five metres, with several stems arising from the base and lacking a single trunk. Shrub plots include

Table 10.4 Suggested format

Location: GPS

Plot no: size of

reading

Land-use system: stratum

the plot

Investigators: date

S. No Species

Tree GBH of stem (cm)

Planted or

Height Status of

1 name

number 1 2 3 4 5

regenerated

(m) crowna

aIndicate the percentage crown cover present or damaged aIndicate the percentage crown cover present or damaged shrub species as well as younger trees with DBH lower than what is defined for the trees in the tree plots. Shrub plots are located inside the tree plots (Fig. 10.5). Parameters to be measured include species, number of stems, DBH, height and weight of the shrub biomass from the sample plot.

Frequency of measurement for shrub vegetation could vary based on vegetation types. Normally, adopt the same frequency as that used for the tree plot measurements.

Demarcation of the shrub plots and the boundary can be undertaken by following the method of laying out shrub plots described in Section 10.10. Shrub plots are usually located at two opposite corners of a tree plot (see cover of the book). If a shrub is on the boundary of the plot, treat it as part of the plot so long as more than 50% of the shrub crown is inside the plot.

Procedure for measuring shrubs and young trees in shrub plots The following steps could be adopted to measure the parameters in the shrub plots:

Step 1: Locate and number the shrub plots in each of the tree plots.

Step 2: Start from one corner of the shrub plots and record the indicator parameters and mark the plants after measurement with a chalk or paint. Step 3: Record the species and the number of shrub plants under each species. Step 4: Measure the height of the tree using the methods described for trees. Step 5: Measure DBH of all trees taller than 1.5 metre in the shrub plot; if multiple shoots are present, record DBH for all the shoots. Step 6: Record the name, height, DBH and other features for each shrub plant in the format provided.

Procedure for measuring non-tree vegetation Vegetation other than trees could include annual or perennial shrubs as well as very young seedlings (shorter than 1.5 m). Estimation of non-tree biomass in shrub plots follows the same method as that for annual and perennial shrubs. Tree seedling should be excluded from harvest procedure.

Biomass of annual shrubs is estimated by cutting the shrubs in the shrub plot, one species at a time, and recording the fresh weight of all the plants. Dry weight of the biomass can be estimated by taking a known quantity (0.5-1.0 kg) of a plant sample and drying it to constant weight in the oven.

Biomass of perennial shrubs is estimated by harvesting the perennial shrub plants in the shrub plot, again species by species, and estimating the fresh and dry weight of the plants. However, if the shrub species is yielding any economically valuable product, such shrub species need not be harvested or a few representative shrub plants could be harvested to get the mean weight for the species. The mean weight of sample shrubs harvested can be extrapolated to the whole plot. Periodic monitoring of shrub and tree biomass Periodic monitoring of shrub biomass could be through harvesting, using the "permanent plot". However, for harvesting, each time select a plot adjacent to the plot harvested before so that measurements are comparable and the impact of earlier harvest is avoided. A suggested format for recording the data is shown below.

Location: Land-use system: Tree plot no: shrub plot no: Investigators: date

GPS reading stratum size of the plot

S. No. Species Diameter (cm) Height (m) Biomass - Fresh weight (kg)

1 DBH1 DBH2 DBH3

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