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Relationship between plant species richness and biomass in an arid sub-alpine grassland of the central Himalayas, Nepal

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Abstract

The hump-shaped relationship between plant species richness and biomass is commonly observed at fine scale for herbaceous vegetation in temperate climates. This relationship predicts that herbaceous species richness is highest at an intermediate level of biomass that corresponds to moderate competition or disturbance. However, this relationship has not previously been investigated in high arid sub-alpine mountain grasslands. We tested the humped-back prediction in the arid Trans-Himalayan mountain grassland with a seasonal grazing system. The study area is located in the bottom of a U-shaped valley, in the Manang district (3500 m a.s.l.). We sampled two hundred plots (1m × 1m) in two different types of pastures: common pasture and old field, which both have similar grazing practices. There was a significant unimodal relationship between species richness and biomass only in the common pasture, and when the two sites were analyzed together. The species turnover is estimated by DCA in standard deviation unit. The turnover was lower in the old field than in the common pasture. The unimodal relationship between plant species richness and biomass did not disappear after accounting for unknown environmental gradients expressed as DCA (detrended correspondence analysis) axes and spatial variables. The species richness is highest at 120 ± 40 g/m2. The results indicate that a hump-shaped relationship is also found in arid Trans-Himalayan grasslands.

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  1. Department of Botany, University of Bergen, Allégaten 41, 5007, Bergen, Norway

    Khem Raj Bhattarai & John A. Grytnes

  2. Centre for Development Studies, University of Bergen, Nygaardsgaten 5, 5015, Bergen, Norway

    Ole R. Vetaas

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  1. Khem Raj Bhattarai
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Bhattarai, K.R., Vetaas, O.R. & Grytnes, J.A. Relationship between plant species richness and biomass in an arid sub-alpine grassland of the central Himalayas, Nepal. Folia Geobot 39, 57–71 (2004). https://doi.org/10.1007/BF02803264

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