Journal of FARM SCIENCES, Vol 30, No 4 (2017)

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Impact of land slope on productivity and diversity of trees in two forest types of Uttara Kannada

GREESHMA SHIVANAND PATGAR, G. R. RAJAKUM, A.G. KOPPAD

Abstract


Distribution of plant community depends mainly on many abiotic factors prevailing in an area. One among themis topography, which includes the slope, aspects, altitude etc. This study analysed the role of land slope in tree diversityand productivity. Study was conducted in two different forest types (semi evergreen and dry deciduous) of Uttara Kannadadistrict. In this study three slope classes were considered (0-2 per cent, 3-8 per cent and >8 per cent ) and plots of30 m × 30 m size was laid in each slope classes using simple random sampling method. In each plot, tree density, volumeand diversity indices were calculated. The result indicated that, maximum productivity was noticed in higher slope class(257.53 m3/ha). Whereas the tree density was higher in 3-8 per cent slope (1157 individuals/ ha). Diversity was also foundmaximum in medium slope class (Shannon diversity index 2.85, Simpson index 0.09, Margalef richness index 6.71 andeveness index 0.81). The density and productivity in lower slope area was less. The variation in productivity and diversityof trees were due to more human activities in the lower slope. Higher slope had the problem of soil erosion which resultedless diversity in study area.

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