Single-tree influence of Tectona grandis Linn. f. on plant distribution and soil characteristics in a planted forest

Bulletin of the National Research Centre

Table 9 Comparing diversity indices of plant species within or outside canopy demarcation of T. grandis

Parameters	Under canopy	Outside canopy demarcation	Remarks
Taxa_S	34	35	Comparable taxa
Individuals	1385	8577	More individuals outside canopy demarcation (OC)
Dominance_D	0.122	0.081	More dominant spp. under canopy (UC)
Simpson_1-D	0.879	0.920	Comparable
Shannon_H	2.656	2.954	OC slightly higher sample diversity
Evenness_e^H/S	0.419	0.548	Species in OC more evenly distributed
Brillouin	2.601	2.941	OC slightly higher group diversity
Menhinick	0.914	0.378	UC with higher species richness than OC
Margalef	4.562	3.754	UC with higher species richness than OC
Equitability_J	0.753	0.831	Plants in OC probably more evenly distributed
Berger-Parker	0.258	0.190	The dominant spp. in UC is more abundant than that in OC
Chao-1	34	35	Comparable taxa

*Calculation is based on the totality of weeds in all 5 quadrants
**The Chao-1 index is a measure of the abundance of individuals belonging to a certain class in a sample. In this case, we are looking at classes being individual species groups. The Berger-Parker index expresses the proportional abundance of the most abundant species