Grazing Effects on Floristic Composition and Above Ground Plant Biomass of the Grasslands in the Northeastern Mongolian Steppes

다국어 초록 (Multilingual 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.

다국어 초록 (Multilingual 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.

참고문헌 (Reference)

1 Xie Y, "Vegetation of the Stipa loess steppe in Ningxia (northern China) in relation to grazing intensity" 53 : 143-145, 2007

2 Wang Y, "Vegetation dynamics of grazing succession in the Stipa baicalensis steppe in Northeastern China" 98 : 83-95, 1992

3 Gunin PD, "Vegetation Dynamics of Mongolia" Kluwer Academic Publication 1-238, 1999

4 Li B, "The vegetation of the Xilin River Basin and its utilization" 3 : 84-183, 1988

5 Hiblig W, "The effects of anthropogenic impact on plant and soil cover in Mongolia" 9 : 1693-1177, 2005

6 Chen Z, "The characteristics of element chemistry of 122 plants on the Xilin river valley, Inner Mongolia" 1 : 112-131, 1985

7 Numata M, "Structure of plant community. In: Theoretical consideration on plant ecology" Tokaidaigaku-shuppankai 51-263, 1987

8 Wuyunna, "Species diversity and phytomass of the grasslands in Inner Mongolia, China" 45 : 140-148, 1999

9 Nachinshonhor GU, "Productivity of Mongolian grassland and nomadism" 59-67, 2002

10 Bai Y, "Positive linear relationship between productivity and diversity: evidence from the Eurasian Steppe" 44 : 1023-1034, 2007

11 Hayashi I, "Plant ecology: Principals and Applications" Kokonshoin 2003

12 Cheng Y, "Phytosociological study on steppe vegetation in the vicinity of Kharkiv, Ukraine" 52 : 61-71, 2006

13 Cheng Y, "Phytosociological study on steppe vegetation in east Kazakhstan" 53 : 172-180, 2007

14 Hayashi I, "Phytomass production of grasslands in Xilin River Basin, Xilingol, Inner Mongolia, China. Bull. Sugadaira Montane" 9 : 13-31, 1988

15 Sasaki T, "Pattern of floristic composition under different grazing intensities in Bulgan, South Gobi, Mongolia" 51 : 235-247, 2005

16 Institute of Meteorology and Hydrology of Mongolia, "Meteorological Records in Mongolia" Ulaanbaatl 2005

17 Kawada K, "Floristic composition and plant biomass production of steppe communities in the vicinity of Kharkiv, Ukraine" 51 : 205-213, 2006

18 Hayashi I, "Five years experiment on vegetation recovery of drought deciduous woodland in Kitui, Kenya" 34 : 351-361, 1996

19 Kawamura K, "Estimation of aboveground biomass in Xilingole steppe, Inner Mongolia Using NOAA/NDVI" 46 : 1-9, 2003

20 Nakamura T, "Effect on grazing on the floristic composition of grassland in Bayinxile, Xilingole, Inner Mongolia" 45 : 342-350, 2000

21 Davâzamc C, "Dynamik der Produktivität der unterirdischen Phytomase der Vegetationszonen der MVR. Arch. Naturschutz u" 25 : 3-11, 1985

22 Wuyunna, "Degeneration of steppe vegetation and the sandy desertification in Inner Mongolia, China" 8 : 17-25, 2004

23 Kawamura K, "Comparing MODIS vegetation indices with AVHRR NDVI for monitoring the forage quantity and quality in Inner Mongolian grassland, China" 51 : 33-40, 2005

24 Yiruhan, "Changes in floristic composition of grasslands according to grazing intensity in Inner Mongolia, China" 47 : 362-369, 2001

25 Kato T, "Carbon dioxide exchange between the atmosphere and alpine meadow ecosystem on the Quinghai-Tibetan Plateau, China" 124 : 121-134, 2004

26 Jiang S, "A comparative study on production of Aneurolepidium chinense and Stipa grandis steppe communities at Baiinxile livestock farm in Inner Mongolia region" 1 : 12-23, 1985