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ISSN : 2287-8327

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Vol.31 No.2
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Grazing Effects on Floristic Composition and Above Ground Plant Biomass of the Grasslands in the Northeastern Mongolian Steppes

Journal of Ecology and Environment / Journal of Ecology and Environment, (P)2287-8327; (E)2288-1220
2008, v.31 no.2, pp.115-123
Hayashi, Ichiroku*
Kiyokazu Kawada (University of Tsukuba)
Mayu Kurosu (Mongolian Academy of Science)
Amgaa Batjargal (National University of Mongolia)
Tsagaanbandi Tsundeekhuu (Mongolian Academy of Science)
Toru Nakamura
Hayashi,, I. , Kiyokazu, K. , Mayu, K. , Amgaa, B. , Tsagaanbandi, T. , & Toru, N. (2008). Grazing Effects on Floristic Composition and Above Ground Plant Biomass of the Grasslands in the Northeastern Mongolian Steppes. Journal of Ecology and Environment, 31(2), 115-123.
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Abstract

We describe plant biomass in the grasslands of the Mongolian steppe obtained using a quadrat sampling technique. Four sites were studied in the northeastern Mongolia located between 47°12'N and 47°40'N and 102°22'E and 112°24'E, which were typical grasslands of the steppe. Biomass, carbon and nitrogen content were determined for the plants collected from the grazed and ungarazed stands. With the measurements above, we expect to obtain information on grazing effects on the grasslands and carbon sequestration of the grassland from the air. In order to estimate the biomass without destroying the stands, we derived an equation to describe the relationship between plant biomass and v-value using plant height and species coverage within the stand. Estimated plant biomass in the ungrazed and grazed stands ranged between 108.0 g m-2 and 13.4 g m-2 and between 97.5 g m-2 and 14.1 g m-2 in late June 2005, respectively. Litter in the ungrazed and grazed stands ranged from 330.3 g m-2 to 78.4 g m-2 and from 188.0 g m-2 to 20.3 g m-2, similarly. Average carbon and nitrogen contents in plants and in litter were 43.0% and 1.9% and 33.7% and 1.4%, respectively. In study sites at Baganuur, the carbon and nitrogen content of plant materials (plant plus litter) was 118.4 g m-2 and 4.7 g m-2 on 30 June 2005.

keywords
Mongolian steppes, Nitrogen and carbon contents, Plant biomass

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