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Table 2 Species richness (number of species m−2) and absolute abundance (numbers in m−2) of herbaceous vegetation and bare ground (%) under three invasion levels of Senna obtusifolia (L.) (non-invaded, lightly invaded, and heavily invaded) at two locations in northern Ethiopia, with statistical results of the GLM (F, P, R2 values)

From: Effect of Senna obtusifolia (L.) invasion on herbaceous vegetation and soil properties of rangelands in the western Tigray, northern Ethiopia

  Species richness of other herbaceous species Abundance of other herbaceous species Abundance of S. obtusifolia
Mean ± SE
Kafta Humera
 Non-invaded 9.9 ± 2.1a 65.9 ± 1.0a 0.0 ± 0.3c
 Lightly invaded 6.5 ± 1.5b 29.7 ± 1.8b 8.2 ± 0.9b
 Heavily invaded 3.5 ± 1.6c 20.1 ± 1.5b 16.7 ± 1.3a
Tsegede
 Non-invaded 7.7 ± 1.8a 57.1 ± 0.8a 0.0 ± 0.2c
 Lightly invaded 5.2 ± 2.0b 25.3 ± 2.2b 6.1 ± 1.3b
 Heavily invaded 5.1 ± 2.4c 31.2 ± 1.6b 22.4 ± 1.5a
 Location (LOC)
  F (df = 1156) 3.89 0.09 1.38
  P 0.050 0.770 0.243
 Invasion level (IL)
  F (df = 2156) 75.28 1378.67 65.85
  P < 0.0001 < 0.0001 < 0.0001
 LOC × IL
  F (df = 2156) 13.54 6.75 6.51
  P < 0.0001 0.0015 0.012
  R2adjusted values 0.538 0.581 0.415
  1. a-c reflects the mean separation values